PHYSICS HIGH SCHOOL

Two skaters stand facing each other. One skater's mass is 60 kg, and the other'smass is 75 kg. The two skaters push off each other. After the push, the smaller
skater has a velocity of 3.0 m/s. If no other forces are acting on the skaters, what
is the velocity of the larger skater?

Answers

Answer 1

Answer:

Answer:

v' = 2.4 m/s

Explanation:

Given that,

Mass of one skater, m = 60 kg

Mass of the other's skater, m' = 60 kg

The two skaters push off each other. After the push, the smaller skater has a velocity of 3.0 m/s.

When there is no external force acting on a system, the momentum remains conserved. It means initial momentum is equal to the final momentum. Let v' is the velocity of the larger skater.

mv = m'v'

$v'=(mv)/(m')\n\nv'=(60* 3)/(75)\n\nv'=2.4\ m/s$

So, the velocity of the larger skater is 2.4 m/s.

Answer 2

Answer:

Final answer:

Considering the law of conservation of momentum, the velocity of the larger skater will be -2.4 m/s. The negative sign indicates the skater is moving in opposite direction.

Explanation:

This problem is solved using the principle of conservation of momentum, in physics. According to the law of conservation of momentum, the total momentum before the push is equal to the total momentum after the push. Initially, when the skaters are not moving, their total momentum is zero. After pushing off, their total momentum remains zero (They move in opposite directions thus one momentum is negative).

Momentum is the product of mass and velocity, symbolized as p=mv.

Let's say the velocity of the larger skater is 'v'. Momentum conservation gives us

60 kg * 3.0 m/s + 75 kg * v = 0

Solving, we find v = - 60 kg * 3.0 m/s / 75 kg = -2.4 m/s.

The negative sign simply indicates that the larger skater is moving in the opposite direction, but the magnitude of the velocity is 2.4 m/s.

Learn more about Conservation of Momentum here:

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Answers

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C. 0
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Please hurry! 30 pointsA free body diagram of a brick on an inclined plane is shown below. What is the coefficient of friction?

Answers

Answer:

50.000

Explanation:

The equation NaCl →Na +Cl is a ______ reaction. A. decomposition B. single displacement C. synthesis

Answers

The correct answer is (a.) decomposition. The equation NaCl --> Na + Cl is a decomposition reaction. That is because the synthesis reaction looks like this Na + Cl = NaCl, and is the opposite of the decomposition. The decomposition reaction is the chemical reaction in which a single compound break into new compounds.

A 2.0 m tall object is 12.0 m from a convex lens that has a 4.0m focal length. Determine the image size and distance from the
lens.?

Answers

Great question! To determine the image size and distance from the lens, we can use the lens formula:

1/f = 1/v - 1/u

where f is the focal length of the lens, v is the image distance, and u is the object distance.

Given that the focal length (f) is 4.0 m and the object distance (u) is 12.0 m, we can substitute these values into the formula:

1/4 = 1/v - 1/12

To solve for v, we need to rearrange the equation:

1/v = 1/4 + 1/12

1/v = (3 + 1)/12

1/v = 4/12

1/v = 1/3

Now, we can find the value of v by taking the reciprocal of both sides:

v = 3 meters

So, the image distance (v) is 3 meters.

To find the image size, we can use the magnification formula:

magnification (m) = -v/u

Given that the object height (h) is 2.0 meters, we can substitute these values into the formula:

m = -v/u = -3/12 = -1/4

The negative sign indicates that the image is inverted. The magnification value of -1/4 means that the image is one-fourth the size of the object.

Therefore, the image size is 1/4 of the object's height, which is 1/4 * 2.0 = 0.5 meters.

So, the image size is 0.5 meters and the image distance is 3 meters from the convex lens.

I hope this explanation helps! Let me know if you have any further questions.

Which of the following states that absolute zero cannot be reached?A. the second law of thermodynamics
B. the first law of thermodynamics
C. the second and third laws of thermodynamics
D. the third law of thermodynamics

Answers

The second and third laws of thermodynamics states that absolute zero cannot be reached. The correct option among all the options that are given in the question is the third option or option "C". Both the laws actually deal with the relations that exist between heat and other forms of energy. I hope the answer helps you.

Answer:

D. the third law of thermodynamics

Explanation:

As per third law of thermodynamics we know that entropy of a perfect crystal comes to zero when the temperature of the crystal reaches to absolute zero.

So as per the theory of entropy we know that entropy of a system cannot be zero as it will reach zero then system will not exist.

So here we can say that

As per third law it is not possible to achieve zero kelvin or absolute zero temperature because at that temperature the entropy will become zero and then the system will not exist in that case.

So here we can say the correct answer will be

D. the third law of thermodynamics

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