Question 1

A pole vaulter clears 3.98 m.With what speed does he strike the mat in the landing area?

Accepted Answer

A) 78.0 m/s 
B) 6.25 m/s 
C) 8.83 m/s 
D) 4.42 m/s 
E) 0.226 m/s 
A) 78.0 m/s 
B) 6.25 m/s 
C) 8.83 m/s 
D) 4.42 m/s 
E) 0.226 m/s

Question 2

A worker pushes a sled with a force of 38.0 N over a level distance of 3.60 m.If a frictional force of 16.0 N acts on the wheelbarrow in a direction opposite to that of the worker,what net work is done on the wheelbarrow?

Accepted Answer

A) 194 J 
B) 137 J 
C) 57.6 J 
D) 79.2 J 
E) 6.11 J 
A) 194 J 
B) 137 J 
C) 57.6 J 
D) 79.2 J 
E) 6.11 J

Question 3

​Jasper takes two books of mass m1 and m2 off the floor and places them on a shelf at height h.The change in potential energy of the book with mass m1 is four times that of the book with mass m2.What is the relationship between m1 and m2?

Accepted Answer

A) ​m1 = 0.25m2 
B) ​m1 = 0.5m2 
C) ​m1 = 2m2 
D) ​m1 = 4m2 
A) ​m1 = 0.25m2 
B) ​m1 = 0.5m2 
C) ​m1 = 2m2 
D) ​m1 = 4m2

Question 4

A simple pendulum,2.0 m in length,is released by a push when the support string is at an angle of 25° from the vertical.If the initial speed of the suspended mass is 1.6 m/s when at the release point,to what maximum angle will it move in the second half of its swing?

Accepted Answer

A) 86.3° 
B) 32.8° 
C) 39.1° 
D) 83° 
E) 180° 
A) 86.3° 
B) 32.8° 
C) 39.1° 
D) 83° 
E) 180°

Question 5

A jet engine develops 1.50 × 105 N of thrust in moving an airplane forward at a speed of 900 km/h.What is the power developed by the engine?

Accepted Answer

A) 1 350 kW 
B) 380 MW 
C) 37.5 MW 
D) 42.5 MW 
E) 32.5 MW 
A) 1 350 kW 
B) 380 MW 
C) 37.5 MW 
D) 42.5 MW 
E) 32.5 MW

Question 6

A 1.00-kg ball has zero kinetic and potential energy.Ernie drops the ball into a 10.0-m-deep well.Just before the ball hits the bottom,the sum of its kinetic and potential energy is:

Accepted Answer

A) zero. 
B) 98.0 J. 
C) −98.0 J. 
D) 196 J. 
E) −196 J. 
A) zero. 
B) 98.0 J. 
C) −98.0 J. 
D) 196 J. 
E) −196 J.

Question 7

A 62.0-kg woman runs up a flight of stairs having a rise of 4.28 m in a time of 4.20 s.What average power did she supply?

Accepted Answer

A) 63.2 W 
B) 619 W 
C) 596 W 
D) 629 W 
E) 609 W 
A) 63.2 W 
B) 619 W 
C) 596 W 
D) 629 W 
E) 609 W

Question 8

A 10.0-kg box starts at rest and slides 3.90 m down a ramp inclined at an angle of 10° with the horizontal.If there is no friction between the ramp surface and crate,what is the velocity of the crate at the bottom of the ramp? (g = 9.8 m/s2)

Accepted Answer

A) 13.3 m/s 
B) 3.64 m/s 
C) 8.74 m/s 
D) 8.68 m/s 
E) 76.4 m/s 
A) 13.3 m/s 
B) 3.64 m/s 
C) 8.74 m/s 
D) 8.68 m/s 
E) 76.4 m/s

Question 9

A spring with spring constant k is used to launch a mass m up a frictionless inclined plane having angle of elevation θ.What is the maximum height reached above the starting elevation of the mass during the motion of the mass if the spring is compressed a distance d before launch?

Accepted Answer

A)    
B)    
C)    
D)    
A)    
B)    
C)    
D)

Question 10

The rate at which work is done is equivalent to which of the following?

Accepted Answer

A) increase in potential energy 
B) thermal energy 
C) potential energy 
D) power 
A) increase in potential energy 
B) thermal energy 
C) potential energy 
D) power

Question 11

In 1908 there was a huge explosion referred to as the Tunguska event which occurred in Siberia.Apparently this was caused by a very large meteorite,a small asteroid,or a comet colliding with the Earth.If the energy released,estimated at 5 × 1016 J,were from the kinetic energy of the object,what would have been its approximate mass if its speed had been 104 m/s?

Accepted Answer

A) 106 kg 
B) 109 kg 
C) 1012 kg 
D) 1014 kg 
A) 106 kg 
B) 109 kg 
C) 1012 kg 
D) 1014 kg

Question 12

A simple pendulum,2.6 m in length,is released with a push when the support string is at an angle of 45.0° from the vertical.If the initial speed of the suspended mass is 1.25 m/s when at the release point,what is its speed at the bottom of the swing? (g = 9.8 m/s2)

Accepted Answer

A) 4.1 m/s. 
B) 3.9 m/s 
C) 4.1 m/s 
D) 16 m/s 
E) 7.2 m/s 
A) 4.1 m/s. 
B) 3.9 m/s 
C) 4.1 m/s 
D) 16 m/s 
E) 7.2 m/s

Question 13

Which of the following is not true about potential energy?

Accepted Answer

A) Potential energy is stored energy. 
B) Potential energy is related to position. 
C) Potential energy is a scalar quantity. 
D) Potential energy has direction. 
A) Potential energy is stored energy. 
B) Potential energy is related to position. 
C) Potential energy is a scalar quantity. 
D) Potential energy has direction.

Question 14

A 1 000-kg sports car accelerates from zero to 25 m/s in 7.0 s.What is the average power delivered by the automobile engine?

Accepted Answer

A) 8.9E+4 W 
B) 1.8E+3 W 
C) 4.5E+4 W 
D) 1.8E+5 W 
E) 5.4E+4 W 
A) 8.9E+4 W 
B) 1.8E+3 W 
C) 4.5E+4 W 
D) 1.8E+5 W 
E) 5.4E+4 W

Question 15

A block is projected with speed v across a horizontal surface and slides to a stop due to friction.The same block is then projected with the same speed v up an incline where is slides to a stop due to friction.In which case did the total mechanical energy of the block decrease the least?

Accepted Answer

A) This problem cannot be solved since it was not indicated whether the horizontal surface and the incline both had the same coefficient of kinetic friction. 
B) The case on the horizontal surface had the least decrease in total mechanical energy. 
C) The case on the inclined surface had the least decrease in total mechanical energy. 
D) In both cases the decrease in mechanical energy was the same. 
A) This problem cannot be solved since it was not indicated whether the horizontal surface and the incline both had the same coefficient of kinetic friction. 
B) The case on the horizontal surface had the least decrease in total mechanical energy. 
C) The case on the inclined surface had the least decrease in total mechanical energy. 
D) In both cases the decrease in mechanical energy was the same.

Question 16

The SI units for k,the spring constant,are equivalent to:

Accepted Answer

A) J. 
B) J / N. 
C) kg / s2. 
D) None of the above. 
A) J. 
B) J / N. 
C) kg / s2. 
D) None of the above.

Question 17

A speed boat requires 85.0 kW to move at a constant speed of 14.0 m/s.What is the resistive force of the water at this speed?

Accepted Answer

A) 1 190 N 
B) 6 070 N 
C) 6 170 N 
D) 5 970 N 
E) 1 290 N 
A) 1 190 N 
B) 6 070 N 
C) 6 170 N 
D) 5 970 N 
E) 1 290 N

Question 18

A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface.As the speed of the mass increases at a constant acceleration,the power delivered to it by the force:

Accepted Answer

A) remains the same. 
B) increases. 
C) decreases. 
D) doubles every 4.0 seconds. 
A) remains the same. 
B) increases. 
C) decreases. 
D) doubles every 4.0 seconds.

Question 19

Motor 1 does 30 J of work in 10 s,motor 2 does 2 J of work in 5 s,motor 3 does 7 J of work in 2 s,and motor 4 does 7 J of work in 3 s.List the motors in order of highest power produced to lowest power produced.

Accepted Answer

A) 2,4,1,3 
B) 3,4,1,2 
C) 1,3,4,2 
D) 3,1,4,2 
A) 2,4,1,3 
B) 3,4,1,2 
C) 1,3,4,2 
D) 3,1,4,2

Question 20

The area under the force vs.displacement curve represents:

Accepted Answer

A) area. 
B) force. 
C) work. 
D) coefficient of static friction. 
A) area. 
B) force. 
C) work. 
D) coefficient of static friction.

Exam 5: Energy

A pole vaulter clears 3.98 m.With what speed does he strike the mat in the landing area?

A worker pushes a sled with a force of 38.0 N over a level distance of 3.60 m.If a frictional force of 16.0 N acts on the wheelbarrow in a direction opposite to that of the worker,what net work is done on the wheelbarrow?

​Jasper takes two books of mass m1 and m2 off the floor and places them on a shelf at height h.The change in potential energy of the book with mass m1 is four times that of the book with mass m2.What is the relationship between m1 and m2?

A simple pendulum,2.0 m in length,is released by a push when the support string is at an angle of 25° from the vertical.If the initial speed of the suspended mass is 1.6 m/s when at the release point,to what maximum angle will it move in the second half of its swing?

A jet engine develops 1.50 × 105 N of thrust in moving an airplane forward at a speed of 900 km/h.What is the power developed by the engine?

A 1.00-kg ball has zero kinetic and potential energy.Ernie drops the ball into a 10.0-m-deep well.Just before the ball hits the bottom,the sum of its kinetic and potential energy is:

A 62.0-kg woman runs up a flight of stairs having a rise of 4.28 m in a time of 4.20 s.What average power did she supply?

A 10.0-kg box starts at rest and slides 3.90 m down a ramp inclined at an angle of 10° with the horizontal.If there is no friction between the ramp surface and crate,what is the velocity of the crate at the bottom of the ramp? (g = 9.8 m/s2)

A spring with spring constant k is used to launch a mass m up a frictionless inclined plane having angle of elevation θ.What is the maximum height reached above the starting elevation of the mass during the motion of the mass if the spring is compressed a distance d before launch?

The rate at which work is done is equivalent to which of the following?

A simple pendulum,2.6 m in length,is released with a push when the support string is at an angle of 45.0° from the vertical.If the initial speed of the suspended mass is 1.25 m/s when at the release point,what is its speed at the bottom of the swing? (g = 9.8 m/s2)

Which of the following is not true about potential energy?

A 1 000-kg sports car accelerates from zero to 25 m/s in 7.0 s.What is the average power delivered by the automobile engine?

A block is projected with speed v across a horizontal surface and slides to a stop due to friction.The same block is then projected with the same speed v up an incline where is slides to a stop due to friction.In which case did the total mechanical energy of the block decrease the least?

The SI units for k,the spring constant,are equivalent to:

A speed boat requires 85.0 kW to move at a constant speed of 14.0 m/s.What is the resistive force of the water at this speed?

A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface.As the speed of the mass increases at a constant acceleration,the power delivered to it by the force:

Motor 1 does 30 J of work in 10 s,motor 2 does 2 J of work in 5 s,motor 3 does 7 J of work in 2 s,and motor 4 does 7 J of work in 3 s.List the motors in order of highest power produced to lowest power produced.

The area under the force vs.displacement curve represents:

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Jasper takes two books of mass m₁ and m₂ off the floor and places them on a shelf at height h.The change in potential energy of the book with mass m₁ is four times that of the book with mass m₂.What is the relationship between m₁ and m₂?

A jet engine develops 1.50 × 10⁵ N of thrust in moving an airplane forward at a speed of 900 km/h.What is the power developed by the engine?

A 10.0-kg box starts at rest and slides 3.90 m down a ramp inclined at an angle of 10° with the horizontal.If there is no friction between the ramp surface and crate,what is the velocity of the crate at the bottom of the ramp? (g = 9.8 m/s²)

A simple pendulum,2.6 m in length,is released with a push when the support string is at an angle of 45.0° from the vertical.If the initial speed of the suspended mass is 1.25 m/s when at the release point,what is its speed at the bottom of the swing? (g = 9.8 m/s²)