9. insulators (nonmetals) have a higher be than metals, and it is more difficult for photons to eject electrons from insulators. discuss how this relates to the free charges in metals that make them good conductors.

The correct answer is 47 units.

Arrows typically serve as a vector's geometric representation. The magnitude of the vector is determined by its length and the direction in which the arrow is pointing. When two vectors have the same magnitude and direction, they are said to be equal. Additionally, the magnitude and direction of vectors are unaffected by the vector's position.

A quantity with both magnitude and direction is referred to as a vector quantity. One example of a vector quantity is velocity. A two-dimensional vector can be expressed as,

A=A_Xi+A_Yj

Vector A=31 j

A+B=-16 j

Thus vector B is

B=(A+B)-A

B=(-16j)-31j

B=(-47)j

As a result, vector B has a magnitude of 47 units and is oriented in a negative Y direction.

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There are C different ways to choose two different automobiles (12, 2).

In mathematics, a choice is made from a set of various components where the order of the choices is unimportant (unlike permutations).

For instance, there are three conceivable combinations of two given fruits, such as an apple, an orange, and a pear: an apple and a pear; an orange and an apple; or an orange and a pear. Formally speaking, a set S's k unique components make up a subset known as a k-combination. In other words, two combinations are same only if all of their members are the same.

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When a 2 kg ball is thrown with an acceleration of 40 m/s². The

force exerted on the ball is 80 N.

According to Newton's second law of motion

F = ma

where, F = force exerted on the object, m = mass of an object and a = acceleration of the object.

Here, m = 2 kg, a = 40 m/s². so, F = ?

Therefore, force (F) exerted on the ball = 40x2 = 80 N

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Answer:

b. Observation

Explanation:

You see ice melt in an experiment, so you record that as one of your observations.

Answer:

Sure...it can be

Explanation:

When a positively charged body is brought near the neutral body, the body is negatively charged through electrostatic induction.

• At contact, the negative charges of a body are attracted to the near end of that body hence neutralization.

• When the positively charged body is removed and the body is earthed, it remaims negatively charged.

[tex]{}[/tex]

The correct answer is 0.024cm.

The density of a substance determines how heavy it will be in a given volume. It is technically the mass of that material per unit volume. It is implied by this that a specific material weighs a specific quantity relative to its volume.

A substance's density determined how heavy it would be at a particular size. It is an inherent quality that is not affected by geography, such as a shift in the globe.

density of copper =  8.93 g/cm3

mass = 3.1118 g

Density= mass/volume

8.93= 3.1118 /volume

volume=3.1118/8.93

=0.348 cm^3

Volume = l×b×t

T= volume/ l×b

=0.348 cm^3/12.10×11.67

=0.348 /141.2

=0.0024×10mm

=0.024cm

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Density of liquid is  ρ = 1.735 [tex]g/cm^{3}[/tex].

Density of liquid is  determined by using formula

ρ = m/v

ρ = 34.719/20

ρ = 1.735 [tex]g/cm^{3}[/tex]

It is possible to measure a material's density by how closely it is packed. The mass per unit volume is how it is formally defined. Density Symbol: ρ or ρ = m/V, where ρ stands for density, m for mass, and V for volume.

The amount of "stuff" that is contained in a certain amount of space is measured by density. In comparison to the softer, lighter element gold, a block of the heavier element lead (Pb) will have a higher density (Au). Less dense than a brick is a block of Styrofoam. Mass per unit volume is how it is referred to.

Both absolute and relative densities are common; they are the two forms of density.

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Both horizontal and vertical acceleration is produced by the jet engines. While it does contribute to vertical acceleration, gravity has no effect on horizontal acceleration.

The term acceleration has to do with the change in the velocity with time. We know that velocity is a vector quantity hence we have to look at the magnitude and the direction of the quantity.

In the same vein, acceleration is a vector quantity. As such we could resolve it into the vertical and the horizontal directions just as we can do for velocity.

The true statement of the situation when we break the acceleration of this missile into two components, in the vertical and horizontal direction, is that; both horizontal and vertical acceleration is produced by the jet engines. While it does contribute to vertical acceleration, gravity has no effect on horizontal acceleration.

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The correct answer is convection.

Convection is the physical movement of material particles that transfers heat from a location of greater temperature to a region of lower temperature.

Convection is a heat-transfer process in which heat energy is transferred by the mass movement of fluid molecules, such as those found in gases and liquids. Under normal circumstances, gases and liquids are poor heat conductors, yet they are nonetheless capable of transferring heat.

Other than through diffusion, advection, or both, convection is the method used to transfer heat. Solids don't experience convection because the particles that make them up don't move.

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The velocity component due north of the cheetah is 14.56 m/s.

The velocity component due west is 10.58 m/s.

The component's of the cheetah's velocity is calculated as follows;

Vy = V sinθ

Vy = 18 m/s x sin(54)

Vy = 14.56 m/s

Vx = V cosθ

Vx = 18 m/s x cos(54)

Vx = 10.58 m/s

Thus, the velocity component due north of the cheetah is 14.56 m/s.

The velocity component due west is 10.58 m/s.

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The distance travelled or how far the car has travelled in 3.3 second at constant speed of 86.4 km/h is 79.2 m.

The speed of an object, also known as v in kinematics, is a scalar quantity that refers to the size of the change in that object's position over time. The average speed of an object over a period of time is calculated by dividing its distance traveled by the length of the interval. Velocity and speed are different concepts. Distance divided by time is the dimension of speed. The meter per second (m/s) is the metric unit used to measure speed.

Speed of car= 86.4 km/h

Since time is given in seconds, converting to km/h to m/s. For converting km/h to m/s, dividing the value given in km/h by 3.6

86.4 km/h= 86.4/3.6 m/s

= 24 m/s

Distance travelled= Velocity* Time

= 24 * 3.3

= 79.2 m

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The rock's maximum speed just as it hits the ground is 28m/s.

Given that the initial speed of the rock is u = -14m/s. (speed taken as negative because the rock thrown down from the cliff)

The height of the tower is h=30m.

Taking height of the tower as origin, then final position of the rock is s= -h= -30m.

On applying the second equation of motion:

s= ut +¹/₂ at²

-30 = -14t+0.5×(-9.8)t²

4.9t²+14t-30=0

On Solving the equation we get, t=1.43s.

To calculate that final speed when rock hits the ground, we apply first equation of motion:

v=u+gt

v=-14+(-9.8)(1.43)

v=-28m/s.

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Displacement has to do with the change of position with time in a specified direction.

The term displacement has to do with the change of position with time in a specified direction. Now let us proceed to solve the questions individually.

1) Displacement = x2 - x1 = 4.27 - 9.2 = -4.93 m

2) Velocity = displacement/ time = x2 - x1/t2 - t1 = 4.27 - 9.2/4.81 - 1.54

= -4.93 m/3.27 = -1.5 m/s

3) The average speed is obtained from;

9.2/1.54 + 4.27/4.81

= 5.97 + 9.08

= 15.05 m/s

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Answer:

Shading coil

Explanation:

The shading coil prevents the solenoid vibrate

Hope this helps

The mass of the box is 11.80N

F= 42.5

a=3.60 m/[tex]s^{2}[/tex]

m=?

F=ma

m=F/a = 42.5/3.60

m=11.80N

The definition of force in physics is: The push or pull on a massed object changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude.

Thrust, which increases an object’s velocity; drag, which decreases an object’s velocity; and torque, which causes changes in an object’s rotational speed, are all concepts connected to force.

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If the equilibrium constant for A + B = C is 0.157, then the equilibrium constant for 2C = 2A + 2B is 40.6.

What is Equilibrium Constant?

The equilibrium constant (K) of a chemical reaction is the relationship between the products and reactants when a chemical reaction reaches equilibrium. The equilibrium constant of concentration (Kc) of a chemical reaction at equilibrium is defined as the ratio of the concentration of products to the concentration of the reactants, each raised to their respective stoichiometric coefficients.

At equilibrium, Rate of the forward reaction = Rate of the backward reaction

Mathematically, it can be stated as:

[tex]r_f=r_b\\k_f\times \alpha\times [A]^a[B]^b=k_b\times \alpha\times [C]^c[D]^d[/tex]

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The kangaroo's minimum vertical speed when it leaves the ground is 5.94 m/s

From the question given above, the following data were obtained:

The inintial velocity of the kangaroo can be obtained as illustrated below:

v² = u² – 2gh (since the ball is going against gravity)

0² = u² – (2 × 9.8 × 1.8)

0 = u² – 35.28

Collect like terms

u² = 0 + 35.28

u² = 35.28

Take the square root of both side

u = √35.28

u = 5.94 m/s

Thus, the minimum vertical speed of the kangaroo when it leaves the ground is 5.94 m/s

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Every type of orbit has a specific energy level is the statement of Niels Bohr’s atomic model that is true in this context related as to the atomic model.

According to the Bohr model, electrons orbit the nucleus at constant energies. Higher energy levels are also present in all orbits that are farther from the nucleus.

Here in, the Light is released as energy when any kind of electrons drop to a kind of lower energy level.

A known, the five elements are created by incredibly tiny particles called atoms when John Dalton first proposed the atomic hypothesis.

Atoms of various elements have different kinds of sizes, masses, and physical-chemical properties, which cannot be possibly separated.

Niels Bohr has further also developed a model that was totally focused on the quantum paradigm in response to this hypothesis.

The orbits that have the maximum orbital energy can be seen as 7s,5f,6d,7p.

Since every electron has kind of the same amount of charge, repulsion is what makes these electrons to stay as far apart as possible.

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Explanation:

12:30pm -> 04:00pm = 3hrs 30mins

3hr 30mins= 3.5hrs

average speed=total distance/total time

=213÷3.5

=60.8571428571

round to 2 decimal places

=60.86 mph

The magnitude of magnetic field is 2194 N/C

Given,

r = 4 m

Q = 3.9 µC

Q = 3.9 × 10⁻⁶ C

Let, the electric field is " E "

E = (k × Q/r²)

E = (9×10⁹×3.9×10⁻⁶/4²)

E = 2193.75 N/C

E = 2194 N/C

A magnetic discipline is a vector field that describes the magnetic affect on moving electric prices, electric powered currents, and magnetic substances. A shifting charge in a magnetic subject reviews a pressure perpendicular to its personal velocity and to the magnetic area.

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The calculated value is 2.5×10⁷ m.

Velocity is a term that describes the speed and direction of a point's motion. For example, a circular path's direction is always perpendicular to a line from the point to the circle's center. A point always moves in a direction that is tangent to its path (a radius). A vector measurement of the rate and direction of motion is what is meant by the term "velocity." Simply said, velocity is the rate of movement in a single direction.

From energy conservation, since the velocity will be 0 at highest point,

1/2 m (10000) ²− GMm/R

=− GMm/d

=10⁸/2 −(9.8) (6400000)

=−(9.8) *(6400000) ²/d

d≈2.5×107 m

Answer is 2.5×10⁷ m.

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Answer:

The graph would increase constantly as shown above until it reached 50m/s. At 10s, the graph would be flat at 50m/s until 20s.

Explanation:

a) As carbon dioxide is formed the shorter candle's flame goes off first, followed by the taller candle. This shows, that in absence of air, the flame goes off. Hence, the air is necessary for combustion.

b) Although both reactants are common home chemicals and foods, care should be taken to avoid splashing in the eyes, and protective clothing should be used. The reaction's byproducts can be disposed of by thoroughly filling the sink with water and washing down the sink with no chemicals touched.

Baking soda and vinegar react with one another to create carbon dioxide gas. The carbon dioxide gas sinks to the bottom of the bowl because it is heavier than the air around it. More and more carbon dioxide gas is produced as the reaction progresses, progressively filling the bowl as it does so. The flame will go out owing to a shortage of oxygen once the level of carbon dioxide reaches that of the flame.

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The correct answer is 5.64.

Since the analogue signal is divided every 100 mV for accuracy of 50 mV, we have 50 discrete observations from 0 to 5V. Thus

It's given that the accuracy is +/- 50mV. This essentially means that the length of interval of permissible accuracy is 100mV.

Now, it's given that the analog voltage range is 0-5 V. So, the number of discrete points in 0-5V will be as follows:

50V/100mV.

Upon solving, it comes out to be 50.

The number of bits is defined by the formula log_2n, where n is the number of discrete points.

In this case, n = 50. Putting the value in the formula,

No of bits = log_2 50

Upon solving,

No of bits = 5.64

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73.5 kilojoules are the answer. Since we can compute potential energy, we can convert 250 into 9.8 into 30 into 73500 joules, or u equal to m g h. Consequently, the body's potential energy will be 73500 joules, which is the necessary amount.

This potential energy calculator allows us to calculate the amount of energy that an elevated object has stored inside it. The full name of this effect is gravitational potential energy, and it refers to the energy that an item stores as a result of its height or vertical position.

The great wrecking ball of the crane. The ball's gravitational potential energy depends on both its mass and how high it is elevated. The relationship between gravitational potential energy and an object's mass and height is seen in the following equation:

PE Gravity equals (m, h, and g). The formula is rather simple to comprehend. The height of a non-raised object will be zero, and as a result, it will have no potential energy.

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The number of electrons is 1.9 * 10^20 electrons.

We know that it is possible to obtain the charge that the electron carries by the use of the formula;

Q = It

Q = magnitude of charge

I = current

t = time taken

Now we have the charge as;

Q = 0.5 A * 60 s = 30 C

Given that;

Q = ne

Q = charge

n = number of electrons

e = magnitude of electronic charge

n = Q /e = 30 C / 1.6 x 10-¹⁹ C​

n = 1.9 * 10^20 electrons

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Answer:

I think it's 12.5s

Explanation:

Bare with me, because I just started physics, but I think I have the answer right... Hopefully.

starting with your knowns, we know velocity is 25 m/s from the problem. you also can figure out your acceleration, -2 m/s.

You're looking for the time it takes until the ball stops rolling. Your time is unknown.

Your equation would be a=v/t (acceleration being a, velocity being v, and time being t)

You have to solve for t giving you t=v/a

Now you have to fill in your numbers. t=25m/s divided by -2m/s^2

Your answer should end up as -12.5

You have to solve for your units, but since you're finding time it's pretty straightforward in knowing you're dealing with seconds.

Hope this helped... :) sorry if it didn't-

Kepler's first law states that a planet moves around the sun in an elliptical orbit, with the sun at one focus.

Planets are large bodies in space which orbit round a star such as the Sun.

The Sun and the planets that orbit around it form the solar system.

The movement of the planets around the Sun is described as planetary motion.

Planetary motion is descried in Kepler's laws of Planetary motion.

The Kepler's laws of Planetary motion are given as follows:

In conclusion, planets orbit around a star.

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If h is the height of the water, then the volume of water is v = r2h. We get [tex]dv/dt[/tex] equal to 0.00994 m/min.

Here, radius = 8m

We have, [tex]V = \pir2h[/tex]

[tex]dV/dT= (\pir2) dh/dt[/tex]

[tex]dV/dT= (\pi82) dh/dt[/tex]

[tex]dV/dT= (\pi64) dh/dt[/tex]

Given [tex]dV/dT = 2[/tex]

Therefore, [tex]dh/dt = 2/(64\pi) = 0.00994 m/min[/tex]

From the definition = a by way of integrating the preliminary velocity, v(0), and the consistent acceleration, one might also find the velocity at a later time, t.

(value of acceleration) means the rate of change of significance of the speed with recognize to time. then again |

| approach the magnitude of the price of change in speed with recognize to time (i.e. the importance of acceleration).

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