Question 1

Which of the following is that form of energy associated with an object's motion?

Accepted Answer

A) potential 
B) thermal 
C) bio-chemical 
D) kinetic 
A) potential 
B) thermal 
C) bio-chemical 
D) kinetic D

Question 2

An automobile delivers 30.0 hp to its wheels when moving at a constant speed of 24.0 m/s.What is the resistance force on the automobile at this speed? (1 hp = 746 watts)

Accepted Answer

A) 5.37E+5 N 
B) 1.21E+3 N 
C) 9.33E+2 N 
D) 3.73E+2 N 
E) 5.97E+2 N 
A) 5.37E+5 N 
B) 1.21E+3 N 
C) 9.33E+2 N 
D) 3.73E+2 N 
E) 5.97E+2 N C

Question 3

The unit of work,joule,is dimensionally the same as:

Accepted Answer

A) newton/second. 
B) newton/kilogram. 
C) newton-second. 
D) newton-meter. 
A) newton/second. 
B) newton/kilogram. 
C) newton-second. 
D) newton-meter. D

Question 4

A Hooke's law spring is compressed a distance d and is used to launch a particle of mass m vertically to a height h above its starting position.Under double the compression,the spring is now used to launch a particle of mass 2m.How high does the second mass rise above its starting position?

Accepted Answer

A) h 
B) 2h 
C) 3h 
D) 4h 
A) h 
B) 2h 
C) 3h 
D) 4h

Question 5

A mover pushes a box of mass m = 56.0 kg along a horizontal floor a distance d = 2.50 m.The constant force exerted on the box by the mover makes an angle of 27.0° directed below the horizontal.Assume the floor is frictionless.If the work done by the mover is W = 200 J,what is the force exerted by the mover?

Accepted Answer

A) 89.8 N 
B) 549 N 
C) 616 N 
D) 176 N 
A) 89.8 N 
B) 549 N 
C) 616 N 
D) 176 N

Question 6

Old Faithful geyser in Yellowstone Park shoots water hourly to a height of 40.0 m.With what velocity does the water leave the ground?

Accepted Answer

A) 14.0 m/s 
B) 19.8 m/s 
C) 20 m/s 
D) 28.0 m/s 
E) 784 m/s 
A) 14.0 m/s 
B) 19.8 m/s 
C) 20 m/s 
D) 28.0 m/s 
E) 784 m/s

Question 7

A Hooke's law spring is compressed 12.0 cm from equilibrium and the potential energy stored is 52.0 J.What is the spring constant in this case?

Accepted Answer

A) 7 220 N/m 
B) 3 610 N/m 
C) 72.2 N/m 
D) 0.722 N/m 
E) No answer is correct. 
A) 7 220 N/m 
B) 3 610 N/m 
C) 72.2 N/m 
D) 0.722 N/m 
E) No answer is correct.

Question 8

Adisa pulls a 35.0-N crate up a 4.00-m-long inclined plane at a constant velocity.If the plane is inclined at an angle of 39.0° to the horizontal and there is a constant force of friction of 13.0 N between the crate and the surface,what is the net change in potential energy of the crate?

Accepted Answer

A) 88 J 
B) −88 J 
C) 109 J 
D) −109 J 
E) None of these 
A) 88 J 
B) −88 J 
C) 109 J 
D) −109 J 
E) None of these

Question 9

A 2.50-kg projectile is launched at an angle of 20.0° above the horizontal with an initial speed of 100 m/s from the top of a building 40 m high.If the projectile is traveling 85.0 m/s at its maximum height of 47.0 m,how much work has been done on the projectile by air friction?

Accepted Answer

A) -3.3E+3 J 
B) 1.7E+2 J 
C) -3.5E+3 J 
D) 2.4E+4 J 
A) -3.3E+3 J 
B) 1.7E+2 J 
C) -3.5E+3 J 
D) 2.4E+4 J

Question 10

A student has to work the following problem: A block is being pulled along at constant speed on a horizontal surface a distance d by a rope supplying a force F at an angle of elevation q.The surface has a frictional force acting during this motion.How much work was done by friction during this motion? The student calculates the value to be -Fdsinq.How does this value compare to the correct value?

Accepted Answer

A) It is the correct value. 
B) It is too high. 
C) It is too low. 
D) The answer cannot be found until it is known whether q is greater than,less than,or equal to 45°. 
A) It is the correct value. 
B) It is too high. 
C) It is too low. 
D) The answer cannot be found until it is known whether q is greater than,less than,or equal to 45°.

Question 11

A baseball outfielder throws a baseball of mass 0.36 kg at a speed of 34.0 m/s and initial angle of 30°.What is the kinetic energy of the baseball at the highest point of the trajectory? Ignore air friction.

Accepted Answer

A) zero 
B) 312 J 
C) 156 J 
D) 52.0 J 
E) 208 J 
A) zero 
B) 312 J 
C) 156 J 
D) 52.0 J 
E) 208 J

Question 12

I use a rope 3.50 m long to swing a 10.8-kg weight around my head.The tension in the rope is 8.25 N.In half a revolution how much work is done by the rope on the weight?

Accepted Answer

A) 28.9 J 
B) 312 J 
C) 25.5 J 
D) 0 J 
E) 0.218 J 
A) 28.9 J 
B) 312 J 
C) 25.5 J 
D) 0 J 
E) 0.218 J

Question 13

A Hooke's law spring is mounted horizontally over a frictionless surface.The spring is then compressed a distance d and is used to launch a mass m along the frictionless surface.What compression of the spring would result in the mass attaining 4 times the speed received in the situation described here?

Accepted Answer

A) 2.00d 
B) 0.50d 
C) 4.00d 
D) 16.00d 
A) 2.00d 
B) 0.50d 
C) 4.00d 
D) 16.00d

Question 14

What is the kinetic energy of a 0.240-kg baseball thrown at 37.5 m/s?

Accepted Answer

A) 338 J 
B) 4.50 J 
C) 169 J 
D) 9.00 J 
E) 37.7 J 
A) 338 J 
B) 4.50 J 
C) 169 J 
D) 9.00 J 
E) 37.7 J

Question 15

A baseball catcher puts on an exhibition by catching a 0.175-kg ball dropped from a helicopter at a height of 89.0 m.What is the speed of the ball just before it hits the catcher's glove 1.00 m above the ground? (g = 9.80 m/s2 and ignore air resistance)

Accepted Answer

A) 41.5 m/s 
B) 0.482 m/s 
C) 1 730 m/s 
D) 29.4 m/s 
E) 42.0 m/s 
A) 41.5 m/s 
B) 0.482 m/s 
C) 1 730 m/s 
D) 29.4 m/s 
E) 42.0 m/s

Question 16

A box is launched up a frictionless incline with an angle of elevation θ.The maximum height reached by the box is h.The box is again launched up the incline with the same initial speed it had before,but this time the angle of elevation has been increased to φ.How does the maximum height H reached this time by the box compare with the previous value h?

Accepted Answer

A) H = h B) H > h C) H < h D) H = ((sinφ)/(sinθ)) A) H = h B) H > h C) H < h D) H = ((sinφ)/(sinθ))

Question 17

A 3.00-kg ball has zero potential and kinetic energy.Maria drops the ball into a 10.0-m-deep well.After the ball comes to a stop in the mud,the sum of its potential and kinetic energy is:

Accepted Answer

A) zero. 
B) 294 J. 
C) −294 J. 
D) 588 J. 
E) −588 J. 
A) zero. 
B) 294 J. 
C) −294 J. 
D) 588 J. 
E) −588 J.

Question 18

I drop a 55-g golf ball from 2.50 m high.It rebounds to 1.65 m.How much energy is lost?

Accepted Answer

A) 0.46 J 
B) 4.6 J 
C) 0.51 J 
D) 0.41 J 
E) 0 
A) 0.46 J 
B) 4.6 J 
C) 0.51 J 
D) 0.41 J 
E) 0

Question 19

A girl and her bicycle have a total mass of 42 kg.At the top of the hill her speed is 4.00 m/s.The hill is 14.3 m high and 112 m long.If the force of friction as she rides down the hill is 20 N,what is her speed at the bottom?

Accepted Answer

A) 4.00 m/s 
B) 15.8 m/s 
C) 13.8 m/s 
D) 63.1 m/s 
E) She stops before she reaches the bottom. 
A) 4.00 m/s 
B) 15.8 m/s 
C) 13.8 m/s 
D) 63.1 m/s 
E) She stops before she reaches the bottom.

Question 20

Water flows over a section of Niagara Falls at a rate of 1.30 × 106 kg/s and falls 52.0 m.What is the power dissipated by the waterfall?

Accepted Answer

A) 6.6E+8 W 
B) 6.8E+7 W 
C) 4.0E+7 W 
D) 5.3E+8 W 
E) 8.6E+6 W 
A) 6.6E+8 W 
B) 6.8E+7 W 
C) 4.0E+7 W 
D) 5.3E+8 W 
E) 8.6E+6 W

Exam 5: Energy

Which of the following is that form of energy associated with an object's motion?

An automobile delivers 30.0 hp to its wheels when moving at a constant speed of 24.0 m/s.What is the resistance force on the automobile at this speed? (1 hp = 746 watts)

The unit of work,joule,is dimensionally the same as:

A Hooke's law spring is compressed a distance d and is used to launch a particle of mass m vertically to a height h above its starting position.Under double the compression,the spring is now used to launch a particle of mass 2m.How high does the second mass rise above its starting position?

Old Faithful geyser in Yellowstone Park shoots water hourly to a height of 40.0 m.With what velocity does the water leave the ground?

A Hooke's law spring is compressed 12.0 cm from equilibrium and the potential energy stored is 52.0 J.What is the spring constant in this case?

Adisa pulls a 35.0-N crate up a 4.00-m-long inclined plane at a constant velocity.If the plane is inclined at an angle of 39.0° to the horizontal and there is a constant force of friction of 13.0 N between the crate and the surface,what is the net change in potential energy of the crate?

A 2.50-kg projectile is launched at an angle of 20.0° above the horizontal with an initial speed of 100 m/s from the top of a building 40 m high.If the projectile is traveling 85.0 m/s at its maximum height of 47.0 m,how much work has been done on the projectile by air friction?

A baseball outfielder throws a baseball of mass 0.36 kg at a speed of 34.0 m/s and initial angle of 30°.What is the kinetic energy of the baseball at the highest point of the trajectory? Ignore air friction.

I use a rope 3.50 m long to swing a 10.8-kg weight around my head.The tension in the rope is 8.25 N.In half a revolution how much work is done by the rope on the weight?

What is the kinetic energy of a 0.240-kg baseball thrown at 37.5 m/s?

A baseball catcher puts on an exhibition by catching a 0.175-kg ball dropped from a helicopter at a height of 89.0 m.What is the speed of the ball just before it hits the catcher's glove 1.00 m above the ground? (g = 9.80 m/s2 and ignore air resistance)

A 3.00-kg ball has zero potential and kinetic energy.Maria drops the ball into a 10.0-m-deep well.After the ball comes to a stop in the mud,the sum of its potential and kinetic energy is:

I drop a 55-g golf ball from 2.50 m high.It rebounds to 1.65 m.How much energy is lost?

A girl and her bicycle have a total mass of 42 kg.At the top of the hill her speed is 4.00 m/s.The hill is 14.3 m high and 112 m long.If the force of friction as she rides down the hill is 20 N,what is her speed at the bottom?

Water flows over a section of Niagara Falls at a rate of 1.30 × 106 kg/s and falls 52.0 m.What is the power dissipated by the waterfall?

Units, Trigonometry, and Vectors

Motion in One Dimension

Motion in Two Dimensions

Newtons Laws of Motion

Momentum, Impulse, and Collisions

Rotational Motion and Gravitation

Rotational Equilibrium and Dynamics

Fluids and Solids

Thermal Physics

Energy in Thermal Processes

The Laws of Thermodynamics

Vibrations and Waves

Sound

Electric Forces and Fields

Electrical Energy and Capacitance

Current and Resistance

Direct-Current Circuits

Magnetism

Induced Voltages and Inductance

Alternating-Current Circuits and Electromagnetic Waves

Reflection and Refraction of Light

Mirrors and Lenses

Wave Optics

Optical Instruments

Relativity

Quantum Physics

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Filters

A baseball catcher puts on an exhibition by catching a 0.175-kg ball dropped from a helicopter at a height of 89.0 m.What is the speed of the ball just before it hits the catcher's glove 1.00 m above the ground? (g = 9.80 m/s² and ignore air resistance)

Water flows over a section of Niagara Falls at a rate of 1.30 × 10⁶ kg/s and falls 52.0 m.What is the power dissipated by the waterfall?