The distance d in front of the landing site should the supplies be dropped is v√(2h/g) meter. If the horizontal velocity of the airplane is v m/s and height of the plane from the ground is h.
Horizontal velocity of the airplane = v
height of the airplane = h
Initial velocity of the food, u = 0 m/s
From the second equation of motion,
S = ut +0.5gt²
h = 0.5gt²
t = √(2h/g)
It is time taken by the food to reach the ground. in this time the horizontal distance travelled by the food is, d = v × t
d = v × √(2h/g)
d = v√(2h/g)
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how does the amount of the moon that is lit by the sun change as it moves from a new moon to a full moon?
As the moon moves from a new moon to a full moon, the amount of the moon that is lit by the sun increases.
What do you mean by Cycle of Moon?Cycle of the moon refers to the sequence of phases that the moon goes through as it orbits around the Earth. This cycle takes approximately 29.5 days to complete, during which the appearance of the moon changes from a new moon, to a waxing crescent, to a first quarter, to a waxing gibbous, to a full moon, to a waning gibbous, to a third quarter, and finally to a waning crescent, before starting the cycle anew as a new moon.
As the moon moves from a new moon to a full moon, the amount of the moon that is lit by the sun increases. During a new moon, only a small portion of the moon is lit and facing the Earth, while during a full moon, the entire illuminated side of the moon is facing the Earth, resulting in a maximum amount of the moon being lit by the sun.
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a disk-shaped platform has a known rotational inertia. the platform is mounted on a fixed axle and rotates in a horizontal plane, as shown above. a student wishes to determine the frictional torque exerted on the platform by the axle as the platform rotates. the student has access to equipment that would usually be found in a school physics laboratory. describe an experimental procedure the student could use to collect the data needed to find the frictional torque exerted on the platform while it rotates.
An experimental procedure the student could use to collect the data needed to find the frictional torque exerted on the platform while it rotates are given below.
What do you mean by intertia?In physics, inertia is the property of an object to resist changes in its motion. It is the tendency of an object to remain at rest or in motion in a straight line at a constant velocity unless acted upon by an external force.
Inertia is related to an object's mass, which is a measure of the amount of matter an object contains. This means that an object with more mass will be more difficult to accelerate, stop, or change its direction of motion compared to an object with less mass.
The student could use the following experimental procedure to determine the frictional torque exerted on the platform while it rotates:
Start by measuring the rotational inertia of the platform using a rotational motion sensor and a known mass added to the platform.Next, mount the platform on the fixed axle and rotate it using a motorized pulley system. Measure the angular velocity of the platform as it rotates.Apply a known torque to the platform using a torque wrench and measure the angular acceleration of the platform.Using the measured angular velocity and angular acceleration, calculate the net torque acting on the platform using the equation torque = I * alpha where I is the rotational inertia of the platform and alpha is the angular acceleration.Repeat step 3 for different values of torque and record the results.The frictional torque on the platform can be calculated by subtracting the net torque from the applied torque.Repeat the above steps at different angular velocities and at different temperatures to check for temperature dependency of the frictional torque.Plot the results of the frictional torque as a function of angular velocity and temperature.By repeating this procedure for different known torques, the student can determine the frictional torque acting on the platform by comparing the applied torque to the measured net torque.
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question what time would it take to produce the displacement represented by a vertical line from 6 m to 8 m in a graph of position vs. time?
It would take one second to produce the displacement represented by a vertical line from 6 m to 8 m in a graph of position vs. time
To calculate the time it would take for a displacement of 2 meters (from 6 m to 8 m) in a graph of position vs. time,
we need to use the equation v = d/t,
where v is the velocity, d is the displacement,
and t is the time.
In this case, we know that d = 2 m and we need to solve for t.
Plugging in the values, we get 2 = d/t, which simplifies to t = 2/d or t = 2/2 = 1 second.
Therefore, it would take 1 second for the displacement represented by a vertical line from 6 m to 8 m in a graph of position vs. time.
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using the principle of conservation of mechanical energy answer the following question. during a jump, a 75 kg individual reaches a height of 0.6 meters which is not at their max height. at this point their vertical velocity is equal to 0.9 m/s. during the up concentric phase of the jump they have an average grf of 1800 newtons directed up and slightly to the right at an angle of 80 degrees above the horizontal. what is their initial vertical velocity at the point of take off and what is their average velocity from the bottom of their countermovement jump to take off?
Athletes are asked to immediately squat to a depth of their choosing and then jump as high as they can in the Countermovement Jump (CMJ), a vertical jump test.
What does a vertical jump countermove?Athletes are asked to immediately squat to a depth of their choosing and then jump as high as they can in the Countermovement Jump (CMJ), a vertical jump test. It is the first leap in our force plate evaluation and is used to gauge lower body power via jump height as well as lower limb asymmetries.With beginning leaping angles of 21 and 38 degrees, respectively, the running jump and standing jump in conventional sports have initial velocities of 9.15 and 2.70 m/s. The initial velocity's maximum strength, the force's angle of engagement, and height are all strongly related to the 9.15 m/s maximum horizontal speed.To learn more about Countermovement refer to:
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recent significant breakthrough in space exploration is
One recent significant breakthrough in space exploration is the successful landing of the Perseverance rover on Mars on February 18, 2021.
The rover is equipped with advanced instruments and technology to search for signs of past microbial life on the planet, as well as to collect samples for future return to Earth. Additionally, the mission includes the Ingenuity helicopter, which successfully completed its first controlled flight on Mars on April 19, 2021, marking the first powered, controlled flight on another planet.
The Perseverance rover, also known as the Mars 2020 mission, was launched on July 30, 2020 and landed on Mars on February 18, 2021. The rover is a car-sized robotic vehicle that is designed to explore the Martian surface and search for signs of past microbial life. It carries a number of scientific instruments, including cameras, spectrometers, drills, and a laser that can vaporize rocks to study their composition.
One of the key objectives of the mission is to collect samples of Martian rock and soil, which will be stored on the rover until a future mission can return them to Earth for further study. The rover is also equipped with a system known as MOXIE, which will attempt to produce oxygen from the carbon dioxide in the Martian atmosphere, which could be used to support human life on the planet.
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Some devices use electromagnetic waves to find the location and speed of an object. In these devices, the waves are emitted and then reflected off of the object and returned back toward the device. By knowing the speed of the wave and the time it takes the wave to return to the device, the distance that the wave traveled can be calculated. Which type of wave would be safest to use in this type of device?
The type of wave that would be safest to use in this type of device would be radio waves.
Other types of electromagnetic waves such as microwaves, infrared, visible light, ultraviolet, X-rays and Gamma rays have a higher frequency and shorter wavelength and more energy per photon, thus they can be ionizing and potentially harmful to humans if exposed to high intensity for a long time.
That's why devices such as radar and sonar, which use radio waves to locate and determine the speed of objects, are considered safe for human use.
What is Radio Waves?Radio waves are a type of electromagnetic wave that have the longest wavelength and lowest frequency of all electromagnetic waves. They are a form of energy that travels through space at the speed of light (about 299,792,458 meters per second).
The wavelength of radio waves ranges from about 1 millimeter to 100 kilometers, and their frequency ranges from about 3 kilohertz (kHz) to 300 gigahertz (GHz). The part of the electromagnetic spectrum that contains radio waves is called the radio frequency (RF) spectrum.
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a girl rides a sledge down a smooth snowy slope
when the authors of one particular astronomy textbook say that astronomers are like police detectives trying to solve crimes, they are explaining that:
Astronomers and police detectives alike must test their hypotheses against all the evidence they gather.
Astronomy is the study of everything in the universe beyond the Earth's atmosphere. This includes visible objects such as the sun, moon, planets, and stars. This includes objects that can only be seen with the telescopes and other instruments, such as distant galaxies and small particles. Astronomers are people who study the planets, stars, and other celestial bodies. They use the ground-based devices like the optical telescope and space-based devices like the Hubble Space Telescope. Some astronomers study distant galaxies and phenomena such as black holes and neutron stars. These are the difference between the astronomer and the police detective.
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an electron is placed at a point where the electric field (due to other charges) is where is a constant with si units of n/c. what is the electric force on the electron? (e is the elementary charge: e
The electric force e = 1.6*10^-19 C) for an electron is placed at a point where the electric field (due to other charges) is where is a constant.
The electron would be an elementary particle with either an elementary electric charge of -1. Electrons are the initial generation of both the lepton particle family as well as are widely regarded as elementary particles due to the lack of known components as well as substructure.
The electric force on the electron is equal to the electric field multiplied by the charge of the electron:
F = E*e = (n/c)*1.6*10^-19 C = 1.6*10^-19*n N
The nucleus and electrons are drawn to one another by the electric force. The void created by a positive or negative charge is referred to as an electric field since it generates a field there.
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if the truck has four-wheel drive, and the cabinet is wooden, what is it's maximum acceleration (in m/s2)?
The maximum acceleration will be 4.9 m/s², if the truck has four wheels and the static friction coefficient is 1.
Let the mass of the truck, M
Let the force require to overcome the static friction is F.
Let the acceleration in the forward direction is a.
Coefficient of static friction, μ = 1
4 wheels(2 rear and 2 front wheels) will share the equal force of friction resistance. Force of friction will be equal to the forward force applied by the truck.
That will be F₁/2 = F₂/2 = F
F₁/2 = F₂/2 = μMg/2 = F
μMg/2 = Ma
a = μg/2
a = (1×9.81)/2
a = 4.9 m/s²
--The give question is incomplete, the complete question is:
"The truck has four-wheel drive, and the cabinet is wooden, what is it's maximum acceleration (in m/s2), if the coefficient of static friction is 1?"
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An 8. 0-kg history textbook is placed on a 1. 25-m high desk. How large is the gravitational potential energy of the textbook-earth system relative to the floor
The textbook-earth system has a gravitational potential energy of 98 J relative to the floor.
What is gravitational potential energy?Gravitational energy, also known as gravitational potential energy, is the potential energy possessed by a massive object in relation to another massive object as a result of gravity. It is the potential energy associated with the gravitational field that is released when two objects collide. Gravitational potential energy is the energy that an object possesses or acquires as a result of a change in its position when it is in a gravitational field. In layman's terms, gravitational potential energy is energy that is related to gravitational force or gravity.
Here,
The energy possessed by a body due to its placement in gravitational field. It is given by:
G.P.E. = m g h
m is the mass of the object, g is the acceleration due to gravity and h is the height.
mass of the book, m = 8.0 kg
height of the desk on which book is kept, h = 1.25 m
acceleration due to gravity, g = 9.8 m/s²
G.P.E = 8.0 kg × 9.8 m/s² × 1.25 m = 98 J
The gravitational potential energy of the textbook-earth system relative to the floor is 98 J.
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what is the air temperature where a tuning fork has a frequency of 534 hz and a wavelength of 64 cm?
The air temperature where a tuning fork has a frequency of 534 hz and a wavelength of 64 cm is calculated to be 16.63 °C.
Frequency of the tuning fork = 534 hz
Wavelength = 64 cm = 64/100 m = 0.64 m
Temperature = ?
We know the relation between speed of air and temperature as,
v = 331 √(1+ T/273) ----(1)
where, T is in Celsius
The relation between speed, wavelength and frequency is said to be,
v = frequency × wavelength = 534 × 0.64 = 341.76 m/s ----(2)
Placing (2) in (1),
341.76 = 331 √(1+ T/273)
1.03 = √(1+ T/273)
1+ T/273 = 1.0609
T/273 = 0.0609
T = 16.63 °C
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a beam of yellow light has a wavelength of 600 nm and a frequency of 500 thz. what is the speed of light?
The speed of light is 3 × 10⁸ m/s, if the wavelength is 600 nm and the frequency of the yellow light is 500 thz.
Wavelength of the yellow light, λ = 600 nm = 6 × 10⁻⁷ m.
Let the speed of yellow light, = v
The frequency of the yellow light, = 500 thz = 5 × 10¹⁴ hz
We know the relationship between speed of the wave, wavelength and the frequency of the wave is as follows:
speed = wavelength × frequency
v = 6 × 10⁻⁷ × 5 × 10¹⁴
n = 3 × 10⁸ m/s
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hey could someone help with this
Because the sun is exactly above the objects at midday and the sun rays drop vertically just on body, the shadow at noon is much shorter than shadows with in morning or the evening.
Explain the role of sun in forming shadows?To create a shadow, two things are required. Light is the first. The second is a light-obstructing object.
These two factors work together to create a space that really is darker than the surroundings. The shadow emerges behind you while the sun is directly in front of you. The shadow forms towards your right if the sun will be to your left. The shadow forms towards your left if the sun would be to your right.The size of such a shadow is influenced by the sun's position. Whenever the sun is lower in the sky, more light is blocked by a person or object. Shadows grow longer as more light is blocked.Whenever the sun is higher in the sky, less light is obstructed. As a result, shadows are shorter.
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a car traveling at a speed of 55 miles per hour on tires that measure 2.6 feet in diameter. find the approximate angular speed of the tires in radians per minute.
The tires approximate angular speed in radians per minute is 221937 radians per minute.
Calculating the angular speed of a car's tires requires the use of a few simple equations.
The first step is to convert the speed from miles per hour to feet per minute. To do this, multiply the speed in mph by 5,280 to get the speed in feet per minute. In this example, 55 mph is equal to 287,400 feet per minute.
Next, calculate the circumference of the tire by multiplying the tire’s diameter by pi. In this example, the circumference is 8.17 feet.
Then, divide the speed in feet per minute by the tire's circumference to get the angular speed in rotations per minute. In this example, 287,400 / 8.17 = 35,145.3 rotations per minute.
Finally, to get the angular speed in radians per minute, multiply the rotations per minute by 2pi. In this example, 35,145.3 x 6.28 = 221,937 radians per minute.
To summarize, the approximate angular speed of a car's tires traveling at 55 mph with a diameter of 2.6 feet is 221,937 radians per minute.
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consider an automobile traveling at a constant speed along a road. determine the direction of the heat and work interactions, taking the following as the system: (a) the car radiator, (b) the car engine, (c) the car wheels, (d) the road, and (e) the air surrounding the car
We can determine the direction of heat and work interactions by understanding heat transfer for an automobile at constant speed.
The car radiator is an example of a heat source, with heat being transferred from the radiator to the engine, wheels, road, and air surrounding the car. It works as per laws of heat transfer.
The engine is an example of a work source, as work is done on the radiator and wheels, allowing the car to move.
The direction of heat and work interactions can be determined by considering the energy cycle of the car. Heat is transferred from the radiator to the engine, from the engine to the wheels, from the wheels to the road, and from the road to the air. Work is done from the engine to the wheels and radiator, and from the road to the wheels.
It is important to note that the heat and work interactions between the car radiator, engine, wheels, and air are not exclusive. In fact, as the car moves, heat is also transferred among all of these components. Heat is transferred from the engine to the wheels and the road, from the wheels to the road, and from the road to the air. Work is also done on the engine and wheels, as the car moves.
In conclusion, the direction of heat and work interactions between the car radiator, engine, wheels, road, and air surrounding the car can be determined by analyzing the energy cycle of the car. Heat is transferred from the radiator to the engine, from the engine to the wheels, from the wheels to the road, and from the road to the air. Work is done from the engine to the wheels and radiator, and from the road to the wheels. Heat and work are also transferred among all of the aforementioned components as the car moves.
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Imagine an astronaut in a spaceship so far away from any celestial objects that we can neglect the effects of gravity.
Assume that there is no air resistance. The astronaut attaches a rock to a rope and starts rotating it fast in a circle.
As there is no ground or other normal force to offset the pull of gravity, an astronaut orbiting the Earth does feel weightless.
Why, despite being in a weightless state, an astronaut in an orbiting spaceship is not in zero gravity? As there is no ground or other normal force to offset the pull of gravity, an astronaut orbiting the Earth does feel weightless.This causes the astronaut to drop.But rather than colliding with the Earth, the astronaut is instead constantly falling around it since they are both traveling so quickly.Inverse relationship: the force of gravity decreases with increasing distance between things, and increases with decreasing distance between objects.Not just planets, stars, and moons are affected by this; every object in the universe is.Centripetal force produces no work at all.The amount of effort done by centripetal force will be zero because it is perpendicular to the direction of motion.To learn more about gravity refer
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what property of a mineral indicates that it has cleavage?
Cleavage is the tendency of a mineral to break along smooth flat surfaces when struck. It is a property that reflects the crystal structure and is an indication of the mineral's internal atomic arrangement. A mineral with cleavage will break along specific planes, often yielding flat and smooth surfaces.
What type of minerals typically exhibit cleavage?Cleavage is a property of minerals that refers to the way they split or break along certain planes. Minerals that exhibit cleavage have a tendency to break along specific, smooth and flat surfaces. This property is caused by the internal arrangement of atoms in the mineral's crystal structure. Minerals that typically exhibit cleavage include micas, halite, calcite, fluorite, quartz, and feldspar. Minerals that exhibit good cleavage can be easily separated into thin sheets or plates, making them useful for a variety of industrial and commercial applications.
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Cleavage is a property of a mineral that indicates its tendency to break along certain flat surfaces, rather than in a random pattern.
What do you mean by Cleavage?Bond cleavage, also known as bond fission, is the splitting of chemical bonds in chemistry. When a molecule is split into two or more pieces, this is commonly referred to as dissociation. According to how the bond is broken, there are generally two types of bond cleavage: homolytic and heterolytic.
In chemistry, cleavage essentially refers to the bond breaking. There are two types of cleavage: (1) An equal distribution of electrons between the two atoms causes a link between them to cleave. (2) In this form of connection, the most electronegative atom receives the bond's electron.
The presence of cleavage is an indicator of the arrangement of atoms in the crystal structure of the mineral, and the direction of the cleavage surfaces is determined by the crystal lattice. The term "cleavage" is often used interchangeably with the term "fracture," although fracture refers to any type of break in the mineral, regardless of whether it follows a specific pattern or not.
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a 2-wire circuit supplies a 36a load that's located 100 ft from the panelboard. the load is wired with 1 awg aluminum conductors in pvc conduit. what's the total alternating-current ohms-to-neutral resistance of the circuit conductors?
The total voltage drop across the 1 awg aluminum conductors is 0.58 volts, if the current carried by the conductor is 36 Ampere.
Current carrying by the conductor, I = 36 A
length of the wire, l = 100 ft.
According to the ampacity Chart For AWG Aluminum Wires, The resistance of the 1 awg aluminum wire is 0.161Ω/1000 ft
So the resistance of the 100 ft wire would be, R = (0.161 × 100)/1000
R = 0.0161 Ω
So the total voltage drop will be, V = IR
V = 36 × 0.0161
V = 0.58 volt
So the total voltage drop across the conductor will be 0.58 volt.
--The given question is incomplete, the complete question is:
"a 2-wire circuit supplies a 36a load that's located 100 ft from the panelboard. the load is wired with 1 awg aluminum conductors in pvc conduit. What will be the total potential drop across the circuit conductors?"
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you have 2.97 amps traveling on the secondary ct circuit of a 2000:5 ct, what are the primary amps on the 69kv bus?
The primary amps on the 69kv bus would be 14.835 amps.
To determine the primary amps on the 69kv bus in this scenario, you would need to use the CT ratio of 2000:5. The CT ratio is used to convert the current on the secondary side of the CT to the current on the primary side. In this case, the secondary current is 2.97 amps, so you would multiply that by the ratio of 2000:5 (2000/5 = 400) to get the primary current.
2.97 amps x 400 = 14.835 amps.
Therefore the primary current on the 69kv bus is 14.835 amps.
It's important to note that this calculation assumes that the CT is functioning correctly and that the primary and secondary circuits are properly connected.
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Which of these stars has the longest lifetime? a main-sequence A star a main-sequence G star a main-sequence M star
Main sequence M star has the longest lifetime. Because the main sequence is the stage of a star's life that lasts the longest, more than 90% of the stars in the cosmos are main sequence stars.
A star ten times as big as the sun will last on the main sequence for only 20 million years. The sun will last approximately 10 billion years. Red dwarfs can live 80 to 100 billion years, which is much longer than the universe's age of 13.8 billion years and half the mass of the sun. A star with only half the mass of the Sun can stay on the main sequence for 80 billion years. Our stellar companions range from nebula to protostar, through the main sequence to red giant, and finally finish as white dwarfs, neutron stars, or black holes.
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write the functio of the following
1.Eardrum
2.Middle
3.Conknea
4.Pina
The eardrum is the thin piece of tissue which is present between the outer and middle ear. This is responsible for the hearing capacity of an individual.
What are the different parts of Ear?The eardrum, middle ear, cochlea, and pinna are important parts of the Ear. The eardrum is a thin piece of tissue which separates the outer and middle ear. Damage to this eardrum may harm hearing capacity. Mastoiditis is an infection of the bony air cells which are present in the mastoid bone, that is located just behind the ear.
Middle ear has three tiny bones including the malleus, incus and stapes. These bones transfer sound vibrations from eardrum to the inner ear.
The cochlea is a hollow, spiral-shaped bone which is found in the inner ear that plays a key role in the sense of hearing and it also participates in the process of auditory transduction. Sound waves are transduced into electrical impulses which the brain can interpret as individual frequencies of sound.
The auricle or pinna is the visible portion of the outer ear. It is responsible for collecting the sound waves and channels them into the ear canal, where the sound is amplified.
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an electric field line diagram is shown below. an electron is placed at point a. the electron is then removed and a proton is placed at point b. what is the direction of the electric force ? give angle relative to x with ccw as positive. what is the direction of the electric force ? what is true of the magnitude of the two forces?
We can find direction by electric field diagram and magnitude remain the same despite of a change in positions.
When a proton is placed at point A and an electron is placed at point B, the direction of the electric force F is determined by the electric field line diagram. The electric force between the two charges is a vector force, which means it has both a magnitude (strength) and a direction.
The magnitude of the electric force F between a proton and an electron is determined by Coulomb's Law, which states that the magnitude of the force between two charges is in direction proportion to charges' product and in inverse proportion with their distance squared.
to the product of the two charges and inversely proportional to the square of the distance between them. Thus, the magnitude of the electric force F between the charges is independent of the direction, so the magnitudes of the electric force F between a proton and an electron, regardless of their positions, will always be the same.
The direction of the electric force F, however, is determined by the electric field line diagram. In the diagram, the electric force F is directed away from the positive charge (the proton) and toward the negative charge (the electron). Therefore, the electric force F will be directed away from point A and toward point B, making the angle relative to the +x axis clockwise, with a positive angle.
In summary, the magnitude of the electric force F between a proton and an electron will remain the same regardless of the positions of the particles, while the direction of the electric force F will be determined by the electric field line diagram, with the angle relative to the +x axis clockwise, with a positive angle.
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how much energy is stored by the electric field between two square plates, 7.9 cm on a side, separated by a 2.1- mm air gap? the charges on the plates are equal and opposite and of magnitude 14 nc . express your answer using two significant figures and include the appropriate units.
Energy is stored by the electric field between two square plates, 7.9 cm on a side, separated by a 2.1- mm is 0.18MV/m.
The electric field stored between two square plates, 7.9 cm on a side, separated by a 2.1-mm air gap is calculated by using the equation
E=V/d, where E is the electric field, V is the voltage, and d is the distance between the plates. The voltage is equal to the charge on the plates divided by the area of the plates,
V=Q/A.
Therefore, the electric field is equal to 14 nC/(7.9 cm)².
The electric field stored is 0.18 MV/m. This energy is expressed using two significant figures and includes the appropriate units.
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A body is weighed under water by a spring balance, reading of spring balance is 20 kg. When salt is added to water then reading of spring balance will
Answer:
The water would increase
Explanation:
Because the more salt you add no matter what amount you add anything the water would allow the scale to increase the numbers as well.
find the net electric potential at the origin due to a semicircular arc of radius r and total charge q.
A rod gets bent into an arc with a radius of R. The distribution of charges along the rod is uniformly linear. the promise in the arc's middle.
What does net potential mean?The potential attributable to each charge when considered separately adds up to the total potential at the origin. Therefore, the effort required to gradually move a charge form infinite to a origin is equal to the sum of the charge as well as the voltage source between the start and end sites.
What is the equation for a semicircular ring's moment of inertia?The equation $I=mr2$, in which m and r are the ring's mass and radius, describes its inertia moment of the a semicircular circle about just a line that passes through its center and is in the plane of a ring.
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5. Explain how changes in ther-
mal energy and changes in
state of matter are related.
Thermal energy absorption or release can cause a change in the state of matter.
How are changes in the state of matter connected to thermal energy?Thermal energy is either supplied or subtracted when a particular piece of matter changes states, but the temperature stays constant. Thermal energy , for instance, is what causes the bonds inside a solid to disintegrate when it is melted.Thermal energy absorption or release can cause a change in the state of matter. State change refers to this alteration. Figure 11's graph illustrates how the temperature of an ice container varies when thermal energy is gradually supplied to it . As a result of being heated, its temperature increases.To learn more about thermal energy refer to:
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A proton of kinetic energy 2. 80 MeV travels head-on toward a lead nucleus which is fixed in space. Assuming that the proton does not penetrate the nucleus and that the only force between proton and nucleus is the Coulomb force, calculate the smallest center-to-center separation dp between proton and nucleus when the proton momentarily stops. If the proton were replaced with an alpha particle (which contains two protons) of the same initial kinetic energy, the alpha particle would stop at center-to-center separation da. What is da/dp?
The smallest center-to-center separation dp between proton and nucleus when the proton momentarily stops is 4.17 x 10^-14m and the ratio da/dp is 2:1.
Given the kinetic energy of proton (KE) = 2.80MeV
The charge if proton (q1) = 1.6 x 10^-19C
The proton hits a lead nucleus. So, the atomic number of lead = 82
The charge on lead nucleus (q2) = 82e = 82 x 1.6 x 10^-19
The Coulomb force is the sole force that exists between the proton and the nucleus because the proton cannot enter the nucleus.
We know that KE = q1V where V is the potential difference
We know that from coulombs law V = kq2/r where r is separation distance
Then r = dp such that dp = kq1/V = kqxq2/KE = kq1q2/KE
dp = (8.9 x 10^9)(1e)(82e)/2.8 MeV
dp = 1167.68 x 10^-10/2.8 x 10^6 = 4.17 x 10^-14m
The the smallest center-to-center separation dp between proton and nucleus is 4.17 x 10^-14m
If the proton was replaced by two alpha particle charge (q1) = 2e
The separation between alpha particle and nucleus = da
da = (8.9 x 10^9)(2e)(82e)/2.8x10^6eV = 2335.36x10^-16/2.8 = 8.34x10^-14m
Hence the required ratio of da/dp = 8.34x10^-14m/4.17 x 10^-14m = 2:1
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a pilot flying low and slow drops a weight; it takes 2.4 s to hit the ground, during which it travels a horizontal distance of 200 m . now the pilot does a run at the same height but twice the speed. how much time does it take the weight to hit the ground?
(1) The time does pilot take the weight to hit the ground = 2.4 s
(2) The pilot travel before land = 400 m
Because fall time is proportional to fall height and acceleration due to gravity (g) is constant,
t₁ = t₂
s₁ = initial distance
s₂ = final distance
t₁ = initial time
t₂ = final time
Hence, the time does it take the weight to hit the ground = 2.4 s
The initial distance (s₁) = 200 m, and the pilot does a run at the same height but twice the speed.
So, the pilot travel before land:
s₂ = 2 x s₁
= 2 x 200 m
= 400 m
The question is incomplete, it should be:
There are competitions in which pilots fly small planes low over the ground and drop weights, trying to hit a target. A pilot flying low and slow drops a weight; it takes 2.4 s to hit the ground, during which it travels a horizontal distance of 200 m. Now the pilot does a run at the same height but twice the speed. How much time does it take the weight to hit the ground? How far does it travel before it lands?
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what distance does the car cover in the last 2.0 seconds of its motion?express your answer using two significant figures.
The distance covered by the car in the last 2.0 seconds of its motion is 4.0 m.
The complete question is in the attachment. Look at the graph. The car travel in three motion.
From 0 - 4sFrom 0 - 4s
The initial velocity = v₁ = 0The final velocity = v₂ = v m/sTravel time = t = 4 - 0 = 4sThe acceleration = aThe distance = d₁According to non-uniform motionFrom 4 - 6s
The velocity = vTravel time = 6 - 4 = 2sAccording to uniform motionFrom 6 - 8s
The initial velocity = v₁ = v m/sThe final velocity = v₂ = 0Travel time = t = 8 - 6 = 2sThe acceleration = aThe distance = d₃According to non-uniform motionThe car travels 20 m in 8.0 s
d = d₁ + d₂ + d₃
20 = 2v + 2v + v
20 = 5v
v = 20/5
v = 4.0 m/s
In the last 2.0 seconds of its motion is from 6 - 8s
d₃ = v
d₃ = 4.0 m
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