The calculated speed is 8 m/s.
The region below the curve in the acceleration vs. time graph can be used to calculate velocity. Similar to the integral in equation, this (1). The area underneath the graph in the first four seconds in this example is just a rectangle with a base of t1=2s and a height of a1=4m/s2.
Therefore, the area is v24=a1
t24=4m/s2
2m/s=8m/s.
Since the particle begins at rest and is not accelerated for the first second, its velocity after 4 seconds is
v (4s) =v24
=8 m/s.
The complete question is- Consider the acceleration of a particle along a straight line with an initial position of 0 m and an initial velocity of 0 m/s.
a. What is the velocity at 4 s?
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What force must the compressed air exert to lift a car weighing 13,300 n? give your answer in newtons.
The compressed air must exert a force of 1318.14 N on the small piston in order to lift the car weighing 13300 N.
What is force?
The concept of force is commonly explained in terms of Newton’s three laws of motion.
According to Newton’s first principle, a body that is at rest or moving at a uniform rate in a straight line will remain in that state until some force is applied to it.
The second law says that when an external force acts on a body, it produces an acceleration in the direction of the force. The magnitude of the acceleration is directly proportional to the magnitude of the external force and inversely proportional to the quantity of matter in the body.
Newton’s third law states that when one body exerts a force on another body, the second body exerts an equal force on the first body.
Because force has both magnitude and direction, it is a vector quantity.
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a motorcyclist passing a road junction moves due west for 8 seconds at a uniform speed of 5m/s. he then moves due north for another 6 seconds with the same speed. at the end of the 6 seconds, his displacement is 50m in what direction?
Answer: N53oW
Explanation: Hope this helps :)
What is the term used to describe the energy of a system that is available to do work?.
The term used to describe the energy of a system that is available to do work is free energy.
What is free energy?Free energy is the energy that is available in a particular chemical system to do useful work.
The Gibbs free energy denoted by G is the enthalpy of a system minus the product of its entropy and absolute temperature.
It is referred to as free because the energy is readily available anytime. Free energy is measured in kilojoules per mole (KJ/mol).
Therefore, it can be said that the term used to describe the energy of a system that is available to do work is free energy.
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in which one of the following cases is the displacement of the object directly proportional to the elapsed time?
Complete Question -
In which one of the following cases is the displacement of the object directly proportional to the elapsed time?
A)a ball rolls with constant velocity
B)a ball at rest is given a constant acceleration
C)a ball rolling with velocity given a constant acceleration
D)a bead falling through oil experiences a decreasing acceleration
E)a rocket fired from the earth's surface experiences an increasing acceleration
A ball rolls with a constant speed is the displacement of the object without delay proportional to the elapsed time.
An item's position adjustments if it movements on the subject of a reference body, inclusive of whilst a passenger actions to the returned of an plane or a lecturer moves to the right on the subject of a whiteboard. Displacement describes this shift in location. Displacement is a vector and shows that an item has moved or has been displaced. This shows that it has both a route and a significance and that it can be visualized as an arrow pointing from the starting place to the finishing region.
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If you run a lap around a track of 200 m. What should be distance and displacement?
an object moving in a straight line has a velocity v in meters per second that varies with time t in seconds according to the following function. v
Based on the calculations, the instantaneous acceleration of this object at time, t = 2 seconds is equal to 2 m/s^2.
What is velocity?Velocity can be defined as the distance covered by an object per unit of time. This ultimately implies that, velocity is a vector quantity because it has both magnitude and direction. Also, velocity can be measured as meter per seconds.
Mathematically, the velocity of any physical object can be calculated by using this formula:
Velocity = displacement/time
What is an instantaneous acceleration?An instantaneous acceleration can be defined as a continuous function of time which gives the ratio of change in velocity of a physical object. Mathematically, instantaneous acceleration can be calculated by taking the derivate of the velocity function.
Taking the derivate of the velocity function, we have:
Velocity, v = 4 + 0.5t^2
dv/dt = 0 + (0.5 × 2)×t^{2-1}
dv/dt = t
Substituting the value of time (t), we have:
Instantaneous acceleration, dv/dt = t
Instantaneous acceleration, dv/dt = 2 m/s^2.
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Complete Question:
An object moving in a straight line has a velocity v in meters per second that varies with time t in seconds according to the following function: v = 4 + 0.5t^2
The instantaneous acceleration of the object at t = 2 seconds is:
answer choices
2 m/s^2
4 m/s^2
5 m/s^2
6 m/s^2
8 m/s^2
If a car drives up an incline at a constant speed, what is the magnitude of its acceleration?.
If there is a hill, it will move more slowly. It will continue moving at the same speed if the surface is flat. Gravity is what causes a slope’s change in speed.
Things move more quickly when moving downhill and more slowly when moving upwards (slow down).
If an object’s speed is constant, can it accelerate?Yes, many individuals initially find this counter-intuitive because they overlook the fact that acceleration can still occur even when an object maintains a constant speed.
What forces are at work when an automobile is climbing a hill?The force that is sent up the hill is powered by the car’s engine. Because the engine makes the drive wheels rotate, the road applies this force, which is actually static friction, to the drive wheels.
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Infrared light, though it may be invisible, has many of the same characteristics of visible light. true or false?
True, infrared light, though it may be invisible, has many of the same characteristics as visible light.
They both travel at the speed of light i.e, 3 x 10^8 m/s.
They both follow the rules of reflection and refraction.
Infrared light and visible light are types of electromagnetic waves.
As shown in the adjoining image, in an electromagnetic wave, the electric field and the magnetic field are perpendicular to each other. Also, the direction of the propagation of the wave is perpendicular to both electric and magnetic fields.
Other than the two kinds of waves mentioned above i.e visible and infrared, the electromagnetic spectrum includes other waves also like X-rays, gamma rays, radio waves, microwaves, and ultraviolet rays.
The waves that are a part of the electromagnetic spectrum have different wavelengths and frequencies, as shown in the adjoining image but they share some common characteristics like:
They travel at the speed of light i.e, 3 x 10^8 m/s.
They obey the rules of reflection and refraction.
Hence, infrared light, though it may be invisible, has many of the same characteristics as visible light.
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True, infrared light, though it may be invisible, has many of the same characteristics as visible light.
They both travel at the speed of light i.e, 3 x 10^8 m/s. They both follow the rules of reflection and refraction. Infrared light and visible light are types of electromagnetic waves.
As shown in the adjoining image, in an electromagnetic wave, the electric field and the magnetic field are perpendicular to each other. Also, the direction of the propagation of the wave is perpendicular to both electric and magnetic fields.
Other than the two kinds of waves mentioned above i.e visible and infrared, the electromagnetic spectrum includes other waves also like X-rays, gamma rays, radio waves, microwaves, and ultraviolet rays.
The waves that are a part of the electromagnetic spectrum have different wavelengths and frequencies, as shown in the adjoining image but they share some common characteristics like:
They travel at the speed of light i.e, 3 x 10^8 m/s.
They obey the rules of reflection and refraction.
Hence, infrared light, though it may be invisible, has many of the same characteristics as visible light.
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Find the wavelength of radiation that can eject 2.00-ev electrons from calcium electrode. the work function for calcium is 2.71 ev.
Radiation with a wavelength of 263.9 nm can eject a 2.00 -eV electron from a calcium electrode. Calcium has a piece function of 2.seventy one eV.
The expelled photoelectrons are E = 2.0 eV, so
⇒ [tex]2.0 eV = E_{in} -2.71 eV[/tex]
⇒ [tex]E_{in}=2.0 eV +2.71eV[/tex]
⇒ [tex]E_{in} = 4.71 eV[/tex]
in Joules, it is
⇒ [tex]E_{in} =4.71*1.6*10^{-19} J[/tex]
⇒ [tex]E_{in} =7.536*10^{-19} J[/tex]
Since [tex]E_{in}=h\nu=\frac{hc}{\lambda}[/tex], the wavelength must be
[tex]\Rightarrow \lambda = \frac{hc}{E_{in} }[/tex]
[tex]\Rightarrow \lambda=\frac{(6.64*10^{-34}Js)(3*10^{8}m/s) }{7.536*10^{-19} J}[/tex]
[tex]\Rightarrow \lambda=263.9\times10^{-9} \; m[/tex]
[tex]\Rightarrow \lambda=263.9 \;n m[/tex]
inside the photoelectric impact, the electricity of the photoelectrons chosen from metallic with work function ∅ thanks to misguided radiation of the entirety
If radiation moves a calcium electrode with the work feature ∅ = 2.seventy one eV and the power of radiation equals
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Explain how emission lines and absorption lines are formed. in what sorts of cosmic objects would you expect to see each?
Absorption lines are created when electrons gain energy from photons, whereas emission lines are created when electrons lose energy (continuous spectrum). Gaseous clouds are sorts of cosmic objects in which we would expect to see each.
When an atom, element, or molecule absorbs a photon with an energy equal to the difference between two energy levels, absorption lines are created. The atom, element, or molecule is considered to be in an excited state when this happens because one electron is elevated to a higher energy level.
In a spectrum, an emission line will be seen if a source emits radiation at a particular wavelength. This emission happens when an excited atom, element, or molecule switches to a lower-energy form.
Gaseous clouds are sorts of cosmic objects in which we would expect to see each. Some of the light at specific wavelengths is scattered when it travels through the atmosphere's gas, producing darker bands. These lines were catalogued by heating common components until they created light and became known as "spectral lines."
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For 21-25. Refer to this Problem A A basket of fruits which is on top of a 3.5m high table has a PE of 44.1 J. What is the mass of the basket of fruits?
According to the given statement The mass of the basket of fruits is 1.2 kg.
What is the meaning of mass?A measurement of inertia, the fundamental property of all stuff. In essence, it's the resistance of a mass of matter to changing its direction or speed in reaction to the application of a force. The more mass a body possesses, the smaller the change that is brought about by an applied force.
Briefing:GPE = mgh
GPE = gravitational potential energy.
m = mass in kilograms (kg).
g = gravitational field strength in (N/kg).
h = change in height in meters (m).
GPE = 44.1 J
g = 9.8 N/kg
h = 3.5 m
Fill in the given values in the formula to find m:
44.1 = m * 9.8 * 3.5
44.1 = 34.3m
m = 44.1/34.3
m = 1.28571429
m = 1.2 kg
The mass of the basket of fruits is 1.2 kg
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I really need help with Physics. This is due in 30 minutes. Please Help!!!!! 60 POINTS
Answer:
i cant see the picture clearly can u resend it?
Explanation:
the friction coefficient between a road and the tyre of a vehicle is 4/3. find the maximum incline the road may have so that once hard brakes are applied and the wheel starts skidding, the vehicle going down at a speed of 36 km/hr is stopped within 5 m.
When the friction coefficient between a road and the tyre of a vehicle is 4/3, the maximum incline that the road may have would be 16° so that when brakes are applied, the vehicle stops within 5 m.
What does friction coefficient mean?The ratio of the frictional force to the normal force is called as the coefficient of friction (COF), which has no dimensions. The ratio that is present between the normal force pressing two surfaces together and the frictional force preventing motion between the two surfaces.
It is mostly represented by using the Greek letter mu (μ) Those materials are said to be as lubricous only if their COF is less than 0.1.
The present Surface roughness and the kind of COF are related to the nature of the materials.
Then we see that,
S=5m,
Friction coefficient (μ)=4/3,
g=10m/[tex]s^{2}[/tex]
speed u=36km/h=10m/s
v=0 a=[tex]\frac{v^{2}-u^{2} }{2s}[/tex] = [tex]\frac{0-10^{2} }{2*5}[/tex] = 10 m/[tex]s^{2}[/tex]
Then,
R−mgcosθ = 0
⇒ R = mgcosθ
then, ma+mgsinθ−μR = 0
⇒ ma+mgsinθ−μmgcosθ = 0
⇒ a + gsin[tex]\theta\\[/tex] - μgcosθ = 0
⇒ 10 + 10sinθ - [tex]\frac{4}{3}[/tex] x 10cosθ = 0
⇒ 30+30sinθ -40cosθ = 0
⇒ 4cosθ - 3sinθ = 3
⇒ 4[tex]\sqrt{1-sin^{2}\theta }[/tex] = 3+3sinθ
if we square both sides, we have,
sinθ = [tex]\frac{18+\sqrt{18^{2}-4(25)(-7) } }{2*25}[/tex]
= 14/50 = 0.28
⇒ θ = [tex]sin^{-1}[/tex] (0.28) = 16°
Hence maximum inclination
θ= 16°
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a key falls from a bridge that is 45 m above the water. it falls directly into a model boat, moving with constant velocity, that is 12 m from the point of impact when the key is released. what is the speed of the boat?
12 m from the point of impact when the key is released, the speed of the boat is 4.0m/s.
What do you mean by the term speed?Velocity is the pace and direction of an object's movement, whereas speed is the time rate at which an object is traveling along a path. In other words, velocity is a vector, whereas speed is a scalar value. Let’s take an example, 15km/hr shows the speed of a vehicle but 15km/hr east shows the velocity of the vehicle. Speed of an object can be calculated mathematically in a simple way. Speed of an object can be found by dividing distance traveled by the object by time taken to cover that distance.
The speed of the boat can be given by , v = d/t
Now, d = 12 m and t is the time the key takes to fall into the boat
Taking the initial time(time at which the key is dropped) to be 0 we calculate t when height(y) is 45 m.
y = ½(gt)^2
t = (2y/g)^(1/2)
t = ((2*45)/9.8)^(1/2)
t = 3.03 s
Therefore, speed of the boat = (distance covered by the boat)/(time taken)
distance = 12/(3.03)= 4.0 m/s
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If the soil can hold a lot of water, it has
Answer: Soils with smaller particles (silt and clay) have a larger surface area than those with larger sand particles, and a large surface area allows a soil to hold more water. In other words, a soil with a high percentage of silt and clay particles, which describes fine soil, has a higher water-holding capacity.
Silty clay loam: 1.80-2.00
Texture: Inches of water storage per foot of soil .
Explanation: hope this helps!!!!
An object of mass 0.9 kg is attached to a massless string of length 3 m, and swung with a tangential velocity of 3 m/s. What is the force exerted by the string on the object?
According to the given statement The force exerted by the string on the object is 2.7 N.
What does tangential velocity mean?Any item travelling in a circular direction has a tangential velocity, which is its linear speed. On a turntable, a point in the centre moves less distance in a full rotation than a point near the outside edge.
How do you calculate tangential velocity?Tangential velocity is determined by dividing the circle's circumference by the time required for one complete rotation: 2*pi*r/t. The formula V = w * r, where w (omega) is the angular velocity of the rotating object and r is the radius of the circle, also relates it to angular velocity.
Briefing:m = 0.9 kg
r = 3m
v = 3m/s
Force (f) = mv2/r
Now ,putting values
force (f) = [tex]\frac{0.9 k g \times\left(3 \mathrm{~ms}^{-1}\right)^2}{3 \mathrm{~m}}[/tex]
F = 2.7 N
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A diagram shows the velocity vector for an object in uniform circular motion. Why is the vector tangential to the circle?
A. The vector shows the path the object would follow if the net force acting on it stopped.
B. The vector indicates the direction of the force on the object.
C. The vector shows how the object pulls against the centripetal force.
D. The vector approximates the curved path at that point.
The vector tangential to the circle because the vector indicates the direction of the force on the object.
What is centripetal force?
Centripetal force is the force acting on an object in circular motion directed towards the axis of rotation.
In a circular motion, the direction of the velocity vector is the same as the direction of the object's motion, the velocity vector is directed tangent to the circle as well.
It also indicate the direction of the centripetal force.
Thus, the vector tangential to the circle because the vector indicates the direction of the force on the object.
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A snowmobile has an initial velocity of 3 m/s. (a) If it accelerates at 0.5 m/s² for 7 seconds
what is the final velocity? (b) If it then accelerates at -0.6 m/s², how long will it take to
reach a complete stop (assume the starting velocity for the negative acceleration is the
answer from part a)?
Answer: a. 6.5 m/s
b. s=10.83 seconds
Explanation:
a. 3+7(0.5)=
3+3.5=6.5 m/s
b. s=seconds
6.5-0.6s=0
6.5-0.6s+0.6s=0+0.6s
6.5=0.6s
6.5=3s/5
6.5*5=3s*5/5
3s=32.5
s=32.5/3
s=65/6
s=10.83 seconds
How much energy is required to bring a 122g block of ice at -45 to steam at 190
degrees?
Answer:
Explanation:
[tex]The amount of the water, m = 200 L = 2.0×105 gThe initial temperature of the water, T1 = 18∘CThe final temperature of the water, T2 = 60∘CThe specific heat of the water, C = 4.184 J/g−∘CThe energy required by the water can be given asE = mC(T2−T1)→E = 2.0×105 g×4.184 J/g−∘C×(60−18)∘C→E = 2.0×105×4.184×42 J∴E = 3.51×107 JHence the energy required for this process is 3.51×107 J.[/tex]
In this experiment, you start with plain dichloromethane (or hexane), and a solution of iodine and potassium iodide in water. what happens during the extraction process?
The correct option is (D) The iodine gets extracted into to the organic solvent, and the potassium iodide remains in the water.
During extraction, the iodine gets extracted into to the organic solvent, and the potassium iodide remains in the water.
What is the extraction principle?For extraction, the principle of like dissolve like is followed.
There are two solvents - water which is polar and dichloromethane (or hexane) which are nonpolar.
We need to extract iodine [tex]I_{2}[/tex] and potassium iodide (KI).
[tex]I_{2}[/tex] is a non-polar molecule that is formed by covalent bonding. But KI is an ionic molecule that exhibits ionic behavior by giving [tex]K^{+}[/tex] and [tex]I^{-}[/tex] ions in aqueous media. Also, there is a difference in their electronegativity. Thus, [tex]I_{2}[/tex] will be extracted in an organic solvent and KI remains soluble in water.
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The complete question is:
"In this experiment, you start with plain dichloromethane (or hexane), and a solution of iodine and potassium iodide in water. what happens during the extraction process?
(a) Both the potassium iodide and the iodine remain in the water
(b) Both the potassium iodide and the iodine get extracted into the organic solvent
(c) The potassium iodide gets extracted into the organic solvent, and the iodine remains in the water
(d) The iodine gets extracted into to the organic solvent, and the potassium iodide remains in the water"
What type of semiconductor is prepared by doping as into si?
a) p-type
b) n-type
c) intrinsic
d) e-type
e) none of these
N- type of semiconductor is denoted by positive ion and free electron.
What is semiconductor?An object known as a capacitor is one that uses an electric field to store electrical energy. There are two terminals on this passive electrical component.
Capacitance is the name for a capacitor's result. A capacitor is a component made to increase the capacitance in a circuit, even though there is some capacitance between any two electrical conductors that are close to one another in a circuit. Condensers and condensators were the previous names for capacitors. Although condenser microphones, sometimes known as capacitor microphones, are an important exception, this word and its cognates are still often used in many other languages outside English.
Practical capacitors come in a wide variety of physical shapes and constructions, and they are used in a variety of ways. A minimum of two electrical conductors are typically found in a capacitor.
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a car is moving forward at 55 mi/hr . what is the direction of the velocity vector?
a, forward
b, backward
c, right
d, left
pls help
Two cars travel along a straight road. When
a stopwatch reads t = 0.00 h, car A is at
XA= 48.0 km moving at a constant speed of
36.0 km/h. Later, when the watch reads
t = 0.50 h, car B is at XB = 0.00 km moving
at 48.0 km/h. Answer the following
questions, first graphically by creating a
position-time graph, and then algebraically
by writing equations for the positions XA
and XB as a function of the stopwatch
cime, t.
The equation for position of car A is [tex]x_{a}[/tex] ( t ) = 36 t + 48.
The equation for position of car B is [tex]x_{b}[/tex] ( 0.5 ) = 36 ( 0.5 ) + c.
The position function in one dimension is written as x ( t ) = vt + c. This equation is for a function starting at t = 0.
x = Distance
t = Time
v = Initial Velocity constant
c = Initial position constant
For car A ,
t = 0
c = 48 km
v = 36 km / h
[tex]x_{a}[/tex] ( 0 ) = 36 ( 0 ) + 48
[tex]x_{a}[/tex] ( 0 ) = 48 km, which is the distance at which car A starts to move from.
For car B,
t = 0.5 hr
c = 0
v = 48 km / h
[tex]x_{b}[/tex] ( 0.5 ) = 48 ( 0.5 ) + 0
[tex]x_{b}[/tex] ( 0.5 ) = 24 km
[tex]x_{b}[/tex] ( 0 ) = 48 ( 0 ) + c
[tex]x_{b}[/tex] ( 0 ) = c
Therefore,
The equation for position of car A is [tex]x_{a}[/tex] ( t ) = 36 t + 48.The equation for position of car B is [tex]x_{b}[/tex] ( 0.5 ) = 36 ( 0.5 ) + c.To know more about position equation as a function of time
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Lance is working in a library using a trolley to carry books. As he stacks books from the trolley on shelves, it gets easier to push or pull the trolley. Which part of Newton’s laws of motion explains the increased ease of moving the trolley?
Answer:
It is the law of f=ma because the lighter the trolley is, the easier it is to push it, because it doesn't have as much mass,
Explanation:
Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day :)
How are earthquake epicenters active volcanoes and mountain ranges distributed on the map?
Answer:
Volcanoes and earthquakes are not randomly distributed around the globe.
Explanation:
Instead they tend to occur along limited zones or belts. With the understanding of plate tectonics, scientists recognized that these belts occur along plate boundaries.
If the initial velocity of an object is upward in the positive direction, what must the sign of the acceleration due to gravity be in a calculation?
Therefore, the direction of motion is positive for upward motion if an object is travelling vertically up. Since gravity accelerates downhill, it is assumed that this acceleration is negative.
Depending on the sign convention you desire to adhere to, the sign of the acceleration caused by gravity (g) might be either positive or negative. G will be positive if you decide to make the downward direction positive and the upward direction negative (an often-used convention). The thing is either standing still or descending. The initial velocity of an object is zero meters per second if it is dropped from a height rather than being hurled.
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Kinetic energy is the energy associated with its position or composistion. True or false
FALSE
Kinetic energy is the energy associated with its motionKinetic Energy is energy of an object's motion due to the object's motionA rolling ball, a moving rollercoaster, and a toy car are few example of kinetic energykinetic energy = ½ × m × V²The mass affects the kinetic energy because the more the mass the more energy is given to the objectEnergy is what makes matter move or change. It is also defined as the ability to do work.Motion is a change in position over timeIn Joules describes the amount of energy needed to do a certain amount of work or cause a certain amount of changeTo know more about Kinetic energy visit : https://brainly.com/question/12669551
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snail starts at a position of 10 cm and moves to a final position 120 , what is its displacement?
Answer:
110cm
Explanation:
displacement= final position- initial position
= 120cm-10cm
= 110cm
an object moving with uniform acceleration has a velocity of 11.0 cm/s in the positive x-direction when its x-coordinate is 2.91 cm. if its x-coordinate 3.25 s later is −5.00 cm, what is its acceleration?
The acceleration of the object is 5.3 cm/[tex]s^{2}[/tex] and is directed towards the negative x - axis.
We have an object moving with uniform acceleration along the + x axis.
We have to determine of the acceleration of object after 3.25 seconds.
According to the question -
initial velocity = u = 11 cm/s along +x axis.
Now, using the second equation of motion -
[tex]$S=ut +\frac{1}{2}at^{2}[/tex]
S = x(2) - x(1) = - 5 - 2.91 = - 7.91 = 7.91 cm along -x axis.
u = 11 cm/s
Substituting the values -
7.91 = 11 x 3.25 + 0.5 x 3.25 x 3.25 x a
7.91 = 35.75 + 5.3a
a = - 5.3 cm/[tex]s^{2}[/tex]
Hence, the acceleration of the object is 5.3 cm/[tex]s^{2}[/tex] and is directed towards the negative x - axis.
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True or false: When a scientist begins an investigation, they must state the problem. The problem is what he or she is going to investigate.
True false question.