Question 1

A 8.00-kg bowling ball falls from a 3.50-m shelf.Just before hitting the floor,what will be its kinetic energy? (g = 9.80 m/s2 and assume air resistance is negligible)

Accepted Answer

A) 280 J 
B) 49.0 J 
C) 2.86 J 
D) 274 J 
E) 28.0 J 
A) 280 J 
B) 49.0 J 
C) 2.86 J 
D) 274 J 
E) 28.0 J

Question 2

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 double the kinetic energy received in the above situation?

Accepted Answer

A) 1.41d 
B) 1.73d 
C) 2.00d 
D) 4.00d 
A) 1.41d 
B) 1.73d 
C) 2.00d 
D) 4.00d

Question 3

A girl and her bicycle have a total mass of 46.0 kg.At the top of the hill her speed is 6.0 m/s,and her speed doubles as she rides down the hill.The hill is 15.0 m high and 105 m long.How much kinetic energy and potential energy is lost to friction?

Accepted Answer

A) 4.3E+3 J 
B) 7.6E+3 J 
C) 3.5E+3 J 
D) 4.4E+3 J 
E) 4.2E+3 J 
A) 4.3E+3 J 
B) 7.6E+3 J 
C) 3.5E+3 J 
D) 4.4E+3 J 
E) 4.2E+3 J

Question 4

A 24.0-kg crate,initially at rest,slides down a ramp 4.0 m long and inclined at an angle of 20° with the horizontal.If there is no friction between ramp surface and crate,what is the kinetic energy of the crate at the bottom of the ramp? (g = 9.8 m/s2)

Accepted Answer

A) 880 J 
B) 940 J 
C) 644 J 
D) 322 J 
E) 161 J 
A) 880 J 
B) 940 J 
C) 644 J 
D) 322 J 
E) 161 J

Question 5

By how much is the energy stored in a Hooke's law spring increased when its stretch is increased from 7.00 cm to 15.00 cm?

Accepted Answer

A) 159% 
B) 259% 
C) 359% 
D) 459% 
E) The correct answer is not given. 
A) 159% 
B) 259% 
C) 359% 
D) 459% 
E) The correct answer is not given.

Question 6

A 2 500-kg ore car rolls 55.0 m down a frictionless 10.0° incline.If there is a horizontal spring at the end of the incline,what spring constant is required to stop the ore car in a distance of 2.10 m?

Accepted Answer

A) 1.1E+5 kN/m 
B) 4.5E+5 kN/m 
C) 2.8E+6 kN/m 
D) 2.4E+5 kN/m 
E) 2.4E+4 kN/m 
A) 1.1E+5 kN/m 
B) 4.5E+5 kN/m 
C) 2.8E+6 kN/m 
D) 2.4E+5 kN/m 
E) 2.4E+4 kN/m

Question 7

A pile driver drives a post into the ground.The mass of the pile driver is 2 600 kg and it is dropped through a height of 9.0 m on each stroke.If the resisting force of the ground is 4.0 × 106 N,how far is the post driven in on each stroke?

Accepted Answer

A) 9.2E+1 cm 
B) 5.9E-3 cm 
C) 7.1E-4 cm 
D) 5.7E-2 cm 
A) 9.2E+1 cm 
B) 5.9E-3 cm 
C) 7.1E-4 cm 
D) 5.7E-2 cm

Question 8

A 1 300-kg automobile moving at 21 m/s has the brakes applied with a deceleration of 3.0 m/s2.How far does the car travel before it stops?

Accepted Answer

A) 7.4E+1 m 
B) 1.5E+2 m 
C) 2.9E+5 m 
D) 2.3E+4 m 
E) 4.3E+2 m 
A) 7.4E+1 m 
B) 1.5E+2 m 
C) 2.9E+5 m 
D) 2.3E+4 m 
E) 4.3E+2 m

Question 9

Which of the following is an example of a nonconservative force?

Accepted Answer

A) gravity 
B) magnetism 
C) friction 
D) Both choices A and B are valid. 
A) gravity 
B) magnetism 
C) friction 
D) Both choices A and B are valid.

Question 10

The quantity of work equal to one joule is also equivalent to which of the following?

Accepted Answer

A) watt 
B) watt /s 
C) watt ⋅ s 
D) watt /s2 
A) watt 
B) watt /s 
C) watt ⋅ s 
D) watt /s2

Question 11

The unit of power,watt,is dimensionally the same as:

Accepted Answer

A) joule-second. 
B) joule/second. 
C) joule-meter. 
D) joule/meter. 
A) joule-second. 
B) joule/second. 
C) joule-meter. 
D) joule/meter.

Question 12

Which of the following is that form of energy associated with an object's location in a conservative force field?

Accepted Answer

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

Question 13

Is it possible for the total mechanical energy of a moving particle to be negative?

Accepted Answer

A) No,because a moving particle has positive kinetic energy. 
B) No,because potential energy cannot have a value more negative than the value of the positive kinetic energy of the particle. 
C) Only if friction is involved. 
D) yes 
A) No,because a moving particle has positive kinetic energy. 
B) No,because potential energy cannot have a value more negative than the value of the positive kinetic energy of the particle. 
C) Only if friction is involved. 
D) yes

Question 14

​A suitcase is sitting on a horizontal conveyor belt,which is moving at speed v.The work done by the frictional force on the suitcase is

Accepted Answer

A) ​positive. 
B) ​negative. 
C) ​zero. 
D) ​impossible to determine without knowing the mass of the suitcase. 
A) ​positive. 
B) ​negative. 
C) ​zero. 
D) ​impossible to determine without knowing the mass of the suitcase.

Question 15

A 180-hp engine can deliver,in SI units,an average power of ____.(1 hp = 746 W)

Accepted Answer

A) 2.4E-1 W 
B) 4.1E+3 W 
C) 1.3E+5 W 
D) 1.8E+2 W 
E) 9.3E+2 W 
A) 2.4E-1 W 
B) 4.1E+3 W 
C) 1.3E+5 W 
D) 1.8E+2 W 
E) 9.3E+2 W

Question 16

Samantha pushes a 60-N crate up a ramp 30 m in length and inclined at 10° with the horizontal.What potential energy change does the crate experience?

Accepted Answer

A) 1.8E+3 J. 
B) 1.8E+3 J 
C) 1.2E+1 J 
D) 3.1E+2 J 
E) 1.0E+4 J 
A) 1.8E+3 J. 
B) 1.8E+3 J 
C) 1.2E+1 J 
D) 3.1E+2 J 
E) 1.0E+4 J

Question 17

If during a given physical process the only force acting on an object is friction,which of the following must be assumed in regard to the object's kinetic energy?

Accepted Answer

A) It decreases. 
B) It increases. 
C) It remains constant. 
D) It cannot be determined from the information given. 
A) It decreases. 
B) It increases. 
C) It remains constant. 
D) It cannot be determined from the information given.

Question 18

Rupel pushes a box 7.00 m by applying a 25.0-N horizontal force.What work does she do?

Accepted Answer

A) 3.57 J 
B) 0.280 J 
C) 175 J 
D) -175.0 J 
E) 25.0 J 
A) 3.57 J 
B) 0.280 J 
C) 175 J 
D) -175.0 J 
E) 25.0 J

Question 19

A hill is 150 m long and makes an angle of 12° with the horizontal.As a 60-kg jogger runs up the hill,how much work does gravity do on the jogger?

Accepted Answer

A) 8.82E+4 J 
B) 1.83E+4 J 
C) −1.83E+4 J 
D) 8.63E+4 J 
E) zero 
A) 8.82E+4 J 
B) 1.83E+4 J 
C) −1.83E+4 J 
D) 8.63E+4 J 
E) zero

Question 20

Yuri,a Russian weightlifter,is able to lift 260 kg 2.10 m in 2.20 s.What is his power output?

Accepted Answer

A) 546 W 
B) 2.43 kW 
C) 1.21 kW 
D) 11.8 kW 
E) 24.3 kW 
A) 546 W 
B) 2.43 kW 
C) 1.21 kW 
D) 11.8 kW 
E) 24.3 kW

Exam 5: Energy

A 8.00-kg bowling ball falls from a 3.50-m shelf.Just before hitting the floor,what will be its kinetic energy? (g = 9.80 m/s2 and assume air resistance is negligible)

A girl and her bicycle have a total mass of 46.0 kg.At the top of the hill her speed is 6.0 m/s,and her speed doubles as she rides down the hill.The hill is 15.0 m high and 105 m long.How much kinetic energy and potential energy is lost to friction?

A 24.0-kg crate,initially at rest,slides down a ramp 4.0 m long and inclined at an angle of 20° with the horizontal.If there is no friction between ramp surface and crate,what is the kinetic energy of the crate at the bottom of the ramp? (g = 9.8 m/s2)

By how much is the energy stored in a Hooke's law spring increased when its stretch is increased from 7.00 cm to 15.00 cm?

A 2 500-kg ore car rolls 55.0 m down a frictionless 10.0° incline.If there is a horizontal spring at the end of the incline,what spring constant is required to stop the ore car in a distance of 2.10 m?

A pile driver drives a post into the ground.The mass of the pile driver is 2 600 kg and it is dropped through a height of 9.0 m on each stroke.If the resisting force of the ground is 4.0 × 106 N,how far is the post driven in on each stroke?

A 1 300-kg automobile moving at 21 m/s has the brakes applied with a deceleration of 3.0 m/s2.How far does the car travel before it stops?

Which of the following is an example of a nonconservative force?

The quantity of work equal to one joule is also equivalent to which of the following?

The unit of power,watt,is dimensionally the same as:

Which of the following is that form of energy associated with an object's location in a conservative force field?

Is it possible for the total mechanical energy of a moving particle to be negative?

​A suitcase is sitting on a horizontal conveyor belt,which is moving at speed v.The work done by the frictional force on the suitcase is

A 180-hp engine can deliver,in SI units,an average power of ____.(1 hp = 746 W)

Samantha pushes a 60-N crate up a ramp 30 m in length and inclined at 10° with the horizontal.What potential energy change does the crate experience?

If during a given physical process the only force acting on an object is friction,which of the following must be assumed in regard to the object's kinetic energy?

Rupel pushes a box 7.00 m by applying a 25.0-N horizontal force.What work does she do?

A hill is 150 m long and makes an angle of 12° with the horizontal.As a 60-kg jogger runs up the hill,how much work does gravity do on the jogger?

Yuri,a Russian weightlifter,is able to lift 260 kg 2.10 m in 2.20 s.What is his power output?

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

Atomic Physics

Nuclear Physics

Nuclear Energy and Elementary Particles

Filters

A 8.00-kg bowling ball falls from a 3.50-m shelf.Just before hitting the floor,what will be its kinetic energy? (g = 9.80 m/s² and assume air resistance is negligible)

A 24.0-kg crate,initially at rest,slides down a ramp 4.0 m long and inclined at an angle of 20° with the horizontal.If there is no friction between ramp surface and crate,what is the kinetic energy of the crate at the bottom of the ramp? (g = 9.8 m/s²)

A pile driver drives a post into the ground.The mass of the pile driver is 2 600 kg and it is dropped through a height of 9.0 m on each stroke.If the resisting force of the ground is 4.0 × 10⁶ N,how far is the post driven in on each stroke?

A 1 300-kg automobile moving at 21 m/s has the brakes applied with a deceleration of 3.0 m/s².How far does the car travel before it stops?

A suitcase is sitting on a horizontal conveyor belt,which is moving at speed v.The work done by the frictional force on the suitcase is