What is the kinetic energy of a 78 mph regulation size baseball? Question 2 You

Question

What is the kinetic energy of a 78 mph regulation size baseball?

Question 2

You are pushing a 150-kg wooden crate in a straight line a distance of 4.5 m across a wooden floor at constant speed. The static and kinetic coefficients of friction are 0.42 and 0.30, respectively. What is the work done by friction on the crate?

Question 3

You are pushing a 150-kg wooden crate in a straight line a distance of 4.5 m across a wooden floor at constant speed. The static and kinetic coefficients of friction are 0.42 and 0.30, respectively. What is the work done by you on the crate?

Question 4

You are pushing a 150-kg wooden crate in a straight line a distance of 4.5 m across a wooden floor. The crate is speeding up at 0.33 m/s2. The static and kinetic coefficients of friction are 0.42 and 0.30, respectively. What is the work done by friction on the crate?


Question 5

You are pushing a 150-kg wooden crate in a straight line a distance of 4.5 m across a wooden floor. The crate is speeding up at 0.45 m/s2. The static and kinetic coefficients of friction are 0.42 and 0.30, respectively. What is the work done by you on the crate?


Question 6

You are driving your car at 25 mph. If you now double your speed, what happens to the kinetic energy?


The kinetic energy doubles.

The kinetic energy decreases by a factor of two.

The kinetic energy decreases by a factor of four.

The kinetic energy quadruples.

Question 7

You drop a ball from the edge of a cliff. Which statement is correct?


The work done by gravitation is zero.

The work done by gravitation is positive.

The answer depends on whether positive y is defined up or down.

The work done by gravitation is negative.

Question 8

Your best friend is grounded at home. You try to get her attention by throwing an acorn against her second floor bedroom window.Which statement about the work done on the acorn is correct?


The answer depends on whether positive y is defined up or down.

The work done by gravitation is negative.

The work done by gravitation is zero.

The work done by gravitation is positive.

Question 9

You throw a juggling ball straight into the air and catch it at the same height. Which statement about the work done on the ball is correct?


The answer depends on whether positive y is defined up or down.

The total work done by gravitation is positive.

The total work done by gravitation is zero.

The total work done by gravitation is negative.

Question 10

You are standing at a red light on SW 8th Street at 97th Avenue. The light turns green, you start speeding up, and the moment you reach 98th Avenue you reach a speed of 43 mph. What is the work done on your 1,277-kg car by the frictional force excerted from the road on the tires.

Question 11

An object is moving along some path. The total work done on the object during this process is zero. Check all correct statements.


The speed of the object has decreased.

The velocity of the object may have changed.

The speed of the object may have changed.

The speed of the object has not changed.

The velocity of the object must not have changed.

The object must be moving in a circle.

Question 12

You drive your 1,357-kg car at a constant speed of 23 mph down a ramp that has a grade of 15 %. Use conservation of energy to find the work done by the frictional force acting from the road on the tires. Define positive direction in the forward direction.


Question 13

You drive your 1100-kg car at a constant speed of 23 mph down a ramp that has a grade of 17 %. Use conservation of energy to find the work done by the frictional force acting from the road on the tires. Then find an expression for the frictional force. Define positive direction in the forward direction. Check the correct answer.(Compare your result with what you found employing Newtons Law.)

fx = -mg sin 0
fx = mg sin 0
fx = -mg cos 0
fx = mg cos 0

Question 14

Converting the energy of one food calorie into mechanical energy, how high could you lift a 181-lbs person?

Question 15

Converting the energy of one food calorie into mechanical energy, starting from rest, to what speed could you accelerate a 162-lbs person?

Explanation / Answer

too many questions in one post.please post separately

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