Question 1

A 4.00 kg ball is moving at 2.00 m/s to the WEST and a 6.00 kg ball is moving at 2.00 m/s to the NORTH.The total momentum of the system is

Accepted Answer

A)  21.6 kg m/s at an angle of 17.7 degrees NORTH of WEST. 
B)  14.4 kg m/s at an angle of 45.2 degrees SOUTH of WEST. 
C)  21.6 kg m/s at an angle of 45.2 degrees SOUTH of WEST. 
D)  14.4 kg m/s at an angle of 56.3 degrees NORTH of WEST. 
E)  21.6 kg m/s at an angle of 56.3 degrees NORTH of WEST. 
A)  21.6 kg m/s at an angle of 17.7 degrees NORTH of WEST. 
B)  14.4 kg m/s at an angle of 45.2 degrees SOUTH of WEST. 
C)  21.6 kg m/s at an angle of 45.2 degrees SOUTH of WEST. 
D)  14.4 kg m/s at an angle of 56.3 degrees NORTH of WEST. 
E)  21.6 kg m/s at an angle of 56.3 degrees NORTH of WEST.

Question 2

A sticky hockey puck slides along a frictionless,horizontal ice surface at 75 m/s in the +x direction.It collides with a second sticky puck originally sliding at 25 m/s in the -y direction.They collide totally inelastically.If the first puck has a mass equal to twice that of the second,what is the angle of their final velocity vector below the +x direction?

Accepted Answer

A)  37 degrees 
B)  9.5 degrees 
C)  49 degrees 
D)  42 degrees 
E)  34 degrees 
A)  37 degrees 
B)  9.5 degrees 
C)  49 degrees 
D)  42 degrees 
E)  34 degrees

Question 3

A 4.00 kg object is moving at 5.00 m/s NORTH.It strikes a 6.00 kg object that is moving EAST at 2.00 m/s.The objects have a completely inelastic (stick together)collision.The velocity of the 6.00 kg object after the collision is

Accepted Answer

A)  2.33 m/s at an angle of 35.0 degrees NORTH of EAST. 
B)  2.33 m/s at an angle of 59.0 degrees NORTH of EAST. 
C)  2.00 m/s at an angle of 59.0 degrees NORTH of EAST. 
D)  2.00 m/s at an angle of 45.0 degrees NORTH of EAST. 
E)  2.33 m/s at an angle of 45.0 degrees NORTH of EAST. 
A)  2.33 m/s at an angle of 35.0 degrees NORTH of EAST. 
B)  2.33 m/s at an angle of 59.0 degrees NORTH of EAST. 
C)  2.00 m/s at an angle of 59.0 degrees NORTH of EAST. 
D)  2.00 m/s at an angle of 45.0 degrees NORTH of EAST. 
E)  2.33 m/s at an angle of 45.0 degrees NORTH of EAST.

Question 4

A 3.00 kg mass is located at x = 2.0 cm and y = -4.0 cm.A 3.00 kg mass is located at x = -5.0 cm and y = 2.0 cm.A 4.00 kg mass is located at x = -3.0 cm and y = -3.0 cm.Where is the location of the center of mass (x,y)?

Accepted Answer

A)  (-0.10 cm,-0.50 cm) 
B)  (-2.1 cm,-1.8 cm) 
C)  (+2.1 cm,-1.8 cm) 
D)  (-2.1 cm,+1.8 cm) 
E)  (+1.1 cm,-2.0 cm) 
A)  (-0.10 cm,-0.50 cm) 
B)  (-2.1 cm,-1.8 cm) 
C)  (+2.1 cm,-1.8 cm) 
D)  (-2.1 cm,+1.8 cm) 
E)  (+1.1 cm,-2.0 cm)

Question 5

Two ice skaters are at rest and facing each other.One skater weighs 140 lbs and the other skater weighs 180 lbs.The skaters "push off" of each other.The 140 lb skater is moving at 5.00 m/s to the EAST.What is the velocity of the 180 lb skater?

Accepted Answer

A)  6.50 m/s EAST 
B)  6.50 m/s WEST 
C)  3.89 m/s EAST 
D)  3.89 m/s WEST 
E)  1.55 m/s EAST 
A)  6.50 m/s EAST 
B)  6.50 m/s WEST 
C)  3.89 m/s EAST 
D)  3.89 m/s WEST 
E)  1.55 m/s EAST

Question 6

A football player leaps at 3.0 m/s toward a second football player,who is at the time of the collision moving at 0.5 m/s toward the first player.After the collision,the two players move together at 1.2 m/s.If the originally stationary player's mass is 175 kg,what is the other's mass?

Accepted Answer

A)  185 kg 
B)  119 kg 
C)  165 kg 
D)  68 kg 
A)  185 kg 
B)  119 kg 
C)  165 kg 
D)  68 kg

Question 7

A machine gun fires 60.0 gram bullets at 6 bullets a second.If the velocity of the bullets is 600 m/s,then the average force on the machine gun is

Accepted Answer

A)  67.0 N. 
B)  75.0 N. 
C)  94.0 N. 
D)  109 N. 
E)  216 N. 
A)  67.0 N. 
B)  75.0 N. 
C)  94.0 N. 
D)  109 N. 
E)  216 N.

Question 8

A 4.00 kg object is moving at 5.00 m/s EAST.It strikes a 5.00 kg that is moving WEST at 2.00 m/s.The objects have a one-dimensional elastic collision in the EAST-WEST direction.The velocity of the 5.00 kg object after the collision is

Accepted Answer

A)  4.22 m/s EAST. 
B)  2.78 m/s WEST. 
C)  4.22 m/s WEST. 
D)  2.78 m/s EAST. 
E)  1.11 m/s WEST. 
A)  4.22 m/s EAST. 
B)  2.78 m/s WEST. 
C)  4.22 m/s WEST. 
D)  2.78 m/s EAST. 
E)  1.11 m/s WEST.

Question 9

A 4.00 kg object is moving at 5.00 m/s NORTH.It strikes a 6.00 kg object that is moving WEST at 2.00 m/s.The objects have a completely inelastic (stick together)collision.The velocity of the 4.00 kg object after the collision is

Accepted Answer

A)  2.54 m/s at an angle of 35.0 degrees NORTH of WEST. 
B)  1.93 m/s at an angle of 59.0 degrees NORTH of WEST. 
C)  1.93 m/s at an angle of 45.0 degrees NORTH of WEST. 
D)  2.33 m/s at an angle of 59.0 degrees NORTH of WEST. 
E)  2.33 m/s at an angle of 45.0 degrees NORTH of WEST. 
A)  2.54 m/s at an angle of 35.0 degrees NORTH of WEST. 
B)  1.93 m/s at an angle of 59.0 degrees NORTH of WEST. 
C)  1.93 m/s at an angle of 45.0 degrees NORTH of WEST. 
D)  2.33 m/s at an angle of 59.0 degrees NORTH of WEST. 
E)  2.33 m/s at an angle of 45.0 degrees NORTH of WEST.

Question 10

A 4.00 kg ball is traveling at 5.00 m/s and strikes a wall.The 4.00 kg ball bounces off the wall with a velocity of 4.0 m/s.The change in momentum of the ball is

Accepted Answer

A)  8.0 kg m/s. 
B)  13 kg m/s. 
C)  26 kg m/s. 
D)  30 kg m/s. 
E)  36 kg m/s. 
A)  8.0 kg m/s. 
B)  13 kg m/s. 
C)  26 kg m/s. 
D)  30 kg m/s. 
E)  36 kg m/s.

Question 11

An astronaut in a space suit is motionless in outer space.The propulsion unit strapped to her back ejects some gas with a velocity of 40.0 m/s.The astronaut recoils with a velocity of 1.00 m/s.If the mass of the astronaut and space suit after the gas is ejected is 100 kg and the mass of the gas ejected is 2.50 kg,then the total kinetic energy after the ejection of the gas is

Accepted Answer

A)  2,050 J. 
B)  3,430 J. 
C)  4,150 J. 
D)  5,070 J. 
E)  6,320 J. 
A)  2,050 J. 
B)  3,430 J. 
C)  4,150 J. 
D)  5,070 J. 
E)  6,320 J.

Question 12

A 4.0 kg object is moving at 5.0 m/s NORTH.It strikes a 6.0 kg object at rest.The objects have an elastic collision and move in the NORTH or SOUTH direction.The velocity of the 4.0 kg object after the collision is

Accepted Answer

A)  1.0 m/s NORTH. 
B)  4.0 m/s NORTH. 
C)  1.0 m/s SOUTH. 
D)  4.0 m/s SOUTH. 
E)  0 m/s. 
A)  1.0 m/s NORTH. 
B)  4.0 m/s NORTH. 
C)  1.0 m/s SOUTH. 
D)  4.0 m/s SOUTH. 
E)  0 m/s.

Question 13

A pair of identical balls is connected by a massless rod,and thrown up into the air.The velocity of the center of mass is initially 17.2 m/s upward.1.0 s later,one of the balls is measured to be at rest.What is the velocity of the other ball at this time? Ignore air resistance.

Accepted Answer

A)  14.8 m/s up 
B)  9.8 m/s down 
C)  7.4 m/s up 
D)  7.4 m/s down 
A)  14.8 m/s up 
B)  9.8 m/s down 
C)  7.4 m/s up 
D)  7.4 m/s down

Question 14

A 90.0 kg person is sitting in a boat at rest with a mass of 100 kg.In the boat is a stone with a mass of 5.00 kg.The person throws the stone at 4.00 m/s horizontally in the NORTH direction.The kinetic energy of the boat and person after the throwing of the stone is

Accepted Answer

A)  5.20 J. 
B)  40.0 J. 
C)  1.05 J. 
D)  2.75 J. 
A)  5.20 J. 
B)  40.0 J. 
C)  1.05 J. 
D)  2.75 J.

Question 15

A 1200 kg car is moving at 5.0 m/s EAST.It strikes an 1800 kg car at rest.The cars have an elastic collision and move in the EAST or WEST direction.The velocity of the 1800 kg car after the collision is

Accepted Answer

A)  3.0 m/s WEST. 
B)  1.0 m/s EAST. 
C)  4.0 m/s EAST. 
D)  4.0 m/s WEST. 
E)  1.0 m/s WEST. 
A)  3.0 m/s WEST. 
B)  1.0 m/s EAST. 
C)  4.0 m/s EAST. 
D)  4.0 m/s WEST. 
E)  1.0 m/s WEST.

Question 16

A 100 kg mass is blown apart into a 90.0 kg piece and a 10.0 kg piece.After the blast,the two masses are moving apart with a relative velocity of 100 m/s.The velocity of the 10.0 kg mass after the explosion is 90.0 m/s.The total kinetic energy of the two masses after the explosion is

Accepted Answer

A)  63,200 J. 
B)  45,000 J. 
C)  30,400 J. 
D)  23,400 J. 
E)  4,500 J. 
A)  63,200 J. 
B)  45,000 J. 
C)  30,400 J. 
D)  23,400 J. 
E)  4,500 J.

Question 17

A 4.00 kg ball is moving at 4.0 m/s to the right and a 6.00 kg ball is moving at 3.00 m/s to the left.The total momentum of the system is

Accepted Answer

A)  16 kg m/s to the right. 
B)  2.0 kg m/s to the right. 
C)  2.0 kg m/s to the left. 
D)  18 kg m/s to the left. 
E)  34 kg m/s to the left. 
A)  16 kg m/s to the right. 
B)  2.0 kg m/s to the right. 
C)  2.0 kg m/s to the left. 
D)  18 kg m/s to the left. 
E)  34 kg m/s to the left.

Question 18

A 4.00 kg object is moving at 5.00 m/s NORTH.It strikes a 6.00 kg object that is moving WEST at 2.00 m/s.The objects have a completely inelastic (stick together)collision.The kinetic energy lost in the collision is

Accepted Answer

A)  34.8 J. 
B)  28.7 J. 
C)  20.4 J. 
D)  18.7 J. 
E)  14.9 J. 
A)  34.8 J. 
B)  28.7 J. 
C)  20.4 J. 
D)  18.7 J. 
E)  14.9 J.

Question 19

The units of momentum are

Accepted Answer

A)  ML/T. 
B)  M/T. 
C)  L/T2. 
D)  ML/T2. 
E)  ML2/T2. 
A)  ML/T. 
B)  M/T. 
C)  L/T2. 
D)  ML/T2. 
E)  ML2/T2.

Question 20

A 1200 kg car is moving at 5.0 m/s EAST.It strikes an 1800 kg car at rest.The cars have an elastic collision and move in the EAST or WEST direction.The relative velocity between the cars after the collision is

Accepted Answer

A)  3.0 m/s WEST. 
B)  1.0 m/s EAST. 
C)  4.0 m/s EAST. 
D)  5.0 m/s EAST. 
E)  1.0 m/s WEST. 
A)  3.0 m/s WEST. 
B)  1.0 m/s EAST. 
C)  4.0 m/s EAST. 
D)  5.0 m/s EAST. 
E)  1.0 m/s WEST.

Exam 7: Linear Momentum

A 4.00 kg ball is moving at 2.00 m/s to the WEST and a 6.00 kg ball is moving at 2.00 m/s to the NORTH.The total momentum of the system is

A 4.00 kg object is moving at 5.00 m/s NORTH.It strikes a 6.00 kg object that is moving EAST at 2.00 m/s.The objects have a completely inelastic (stick together)collision.The velocity of the 6.00 kg object after the collision is

A 3.00 kg mass is located at x = 2.0 cm and y = -4.0 cm.A 3.00 kg mass is located at x = -5.0 cm and y = 2.0 cm.A 4.00 kg mass is located at x = -3.0 cm and y = -3.0 cm.Where is the location of the center of mass (x,y)?

Two ice skaters are at rest and facing each other.One skater weighs 140 lbs and the other skater weighs 180 lbs.The skaters "push off" of each other.The 140 lb skater is moving at 5.00 m/s to the EAST.What is the velocity of the 180 lb skater?

A football player leaps at 3.0 m/s toward a second football player,who is at the time of the collision moving at 0.5 m/s toward the first player.After the collision,the two players move together at 1.2 m/s.If the originally stationary player's mass is 175 kg,what is the other's mass?

A machine gun fires 60.0 gram bullets at 6 bullets a second.If the velocity of the bullets is 600 m/s,then the average force on the machine gun is

A 4.00 kg object is moving at 5.00 m/s EAST.It strikes a 5.00 kg that is moving WEST at 2.00 m/s.The objects have a one-dimensional elastic collision in the EAST-WEST direction.The velocity of the 5.00 kg object after the collision is

A 4.00 kg object is moving at 5.00 m/s NORTH.It strikes a 6.00 kg object that is moving WEST at 2.00 m/s.The objects have a completely inelastic (stick together)collision.The velocity of the 4.00 kg object after the collision is

A 4.00 kg ball is traveling at 5.00 m/s and strikes a wall.The 4.00 kg ball bounces off the wall with a velocity of 4.0 m/s.The change in momentum of the ball is

A 4.0 kg object is moving at 5.0 m/s NORTH.It strikes a 6.0 kg object at rest.The objects have an elastic collision and move in the NORTH or SOUTH direction.The velocity of the 4.0 kg object after the collision is

A pair of identical balls is connected by a massless rod,and thrown up into the air.The velocity of the center of mass is initially 17.2 m/s upward.1.0 s later,one of the balls is measured to be at rest.What is the velocity of the other ball at this time? Ignore air resistance.

A 90.0 kg person is sitting in a boat at rest with a mass of 100 kg.In the boat is a stone with a mass of 5.00 kg.The person throws the stone at 4.00 m/s horizontally in the NORTH direction.The kinetic energy of the boat and person after the throwing of the stone is

A 1200 kg car is moving at 5.0 m/s EAST.It strikes an 1800 kg car at rest.The cars have an elastic collision and move in the EAST or WEST direction.The velocity of the 1800 kg car after the collision is

A 100 kg mass is blown apart into a 90.0 kg piece and a 10.0 kg piece.After the blast,the two masses are moving apart with a relative velocity of 100 m/s.The velocity of the 10.0 kg mass after the explosion is 90.0 m/s.The total kinetic energy of the two masses after the explosion is

A 4.00 kg ball is moving at 4.0 m/s to the right and a 6.00 kg ball is moving at 3.00 m/s to the left.The total momentum of the system is

A 4.00 kg object is moving at 5.00 m/s NORTH.It strikes a 6.00 kg object that is moving WEST at 2.00 m/s.The objects have a completely inelastic (stick together)collision.The kinetic energy lost in the collision is

The units of momentum are

A 1200 kg car is moving at 5.0 m/s EAST.It strikes an 1800 kg car at rest.The cars have an elastic collision and move in the EAST or WEST direction.The relative velocity between the cars after the collision is

Introduction

Force

Acceleration and Newtons Second Law of Motion

Motion With Constant Acceleration

Circular Motion

Conservation of Energy

Torque and Angular Momentum

Fluids

Elasticity and Oscillations

Waves

Sound

Temperature and the Ideal Gas

Heat

Thermodynamics

Electric Forces and Fields

Electric Potential

Electric Current and Circuits

Magnetic Forces and Fields

Electromagnetic Induction

Alternating Current

Electromagnetic Waves

Reflection and Refraction of Light

Optical Instruments

Interference and Diffraction

Relativity

Early Quantum Physics and the Photon

Quantum Physics

Nuclear Physics

Particle Physics

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