Question 1

A box slides down a frictionless inclined plane.Starting from rest,the box slides a distance of 0.73 m and reaches a speed of 2.1 m/s.What is the angle of inclination of the plane with respect to the horizontal?

Accepted Answer

A) 3.0 degrees 
B) 18 degrees 
C) 20 degrees 
D) 70 degrees 
E) 72 degrees

Question 2

The mass of an object is

Accepted Answer

A) equal to its weight on the surface of the Earth. 
B) equal to its weight in deep space. 
C) never equal to its weight. 
D) sometimes equal to its weight.

Question 3

Consider two blocks hung by a massless string from a frictionless pulley as shown in the figure.The masses of the blocks are m1=5 kg and m2=7 kg.The bottoms of the blocks are 20 meters above the top of the table.When they are released from rest,how many seconds will it take for one of the blocks to hit the table (within 5% accuracy)?

Accepted Answer

A) 2 
B) 3 
C) 4 
D) 5 
E) 6

Question 4

A 5000-kg (= 11000 lb)truck needs to make an emergency stop.The truck is traveling at a speed of 30 m/s (= 67.5 mph)when the brakes are applied.How far does the truck travel assuming that the coefficient of kinetic friction is 0.7?

Accepted Answer

A) 34 m 
B) 66 m 
C) 131 m 
D) 345 m 
E) 882 m

Question 5

A mass m1 of 4.00 kg slides on a frictionless surface.This mass is connected to another mass m2 of 1.50 kg by a massless string over a frictionless pulley.The masses are held motionless and then released.After the masses are released,what is the tension in the string?

Accepted Answer

A) 39.2 N 
B) 2.68 N 
C) 9.81 N 
D) 14.7 N 
E) 5.91 N

Question 6

A mass,m1 slides on a frictionless surface.This mass is connected to another mass m2 of 5.00 kg by a massless string over a frictionless pulley.The masses are held motionless and then released.Mass m2 accelerates downward at 4.10 m/s2.What is the mass of m1?

Accepted Answer

A) 6.96 kg 
B) 1.47 kg 
C) 17.0 kg 
D) 3.59 kg 
E) 5.00 kg

Question 7

The mass in the picture below is sliding up the incline with no external forces applied.Which diagram for the forces along the incline is correct?

Accepted Answer

A) a 
B) b 
C) c 
D) d 
E) e

Question 8

An 85.0-kg snowboarder slides down a frictionless slope inclined at an angle of 30S1U1P1$\circ$S1S1P0.What is her acceleration?

Accepted Answer

A) 1.18 m/s2 
B) 2.49 m/s2 
C) 4.91 m/s2 
D) 9.81 m/s2

Question 9

An object with mass 7.00 kg is being pushed up a rough inclined plane with a constant force F = 50.0 N.The plane makes an angle of 20.0S1U1P1$\circ$S1S1P0 with respect to the horizontal.The object is moving with constant velocity.What is the coefficient of kinetic friction between the object and the surface?

Accepted Answer

A) 0.411 
B) 0.300 
C) 0.377 
D) 0.158 
E) 0.272

Question 10

A 1.23-kg box slides up an incline plane with a speed of 8.6 m/s.If the angle of the plane with respect to the horizontal is 11 degrees and the coefficient of friction is 0.33,how long will it take for the box to come to rest?

Accepted Answer

A) 1.7 s 
B) 2.5 s 
C) 2.7 s 
D) 17 s

Question 11

Two blocks,B1 and B2 with masses of 12.0 kg and 5.60 kg,respectively,are in contact with each other on a frictionless horizontal surface.A purely horizontal force of 30.0 N is applied to B1,which in turn pushes B2 and both blocks accelerate together uniformly.The net horizontal force acting on B2 is

Accepted Answer

A) 9.55 N. 
B) 15.0 N. 
C) 20.5 N. 
D) 30.0 N. 
E) 60.0 N.

Question 12

A skydiver of mass 90.0 kg (including outfit and equipment)floats down suspended from his parachute,having reached terminal speed,8.35 m/s.The area of his parachute is 40.0 m2 and the density of air is 1.15 kg/m3.The drag coefficient is

Accepted Answer

A) 0.490. 
B) 0.521. 
C) 0.533. 
D) 0.551. 
E) 0.560.

Question 13

A skydiver of mass 90.0 kg (including outfit and equipment)floats down suspended from his parachute,having reached terminal speed of 12.3 m/s.The drag coefficient is 0.533,and the density of air is 1.15 kg/m3.The area of her parachute is

Accepted Answer

A) 40.0 m2. 
B) 38.0 m2. 
C) 30.0 m2. 
D) 23.0 m2. 
E) 19.0 m2.

Question 14

A box with a mass of 10 kg is sliding along the top of a rough,horizontal table at a speed of 30 m/s.The friction between the box and the table brings the box to rest in a time of 6.0 s.What is the coefficient of friction between the box and the table?

Accepted Answer

A) 0.20 
B) 0.31 
C) 0.51 
D) 1.0 
E) 2.0

Question 15

An object of mass m is at rest on a horizontal surface,and the coefficient of static friction is  and kinetic friction  .If a force F is applied to the object as shown and it remains at rest,then it must be true that

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 16

A 2.0-kg object,initially at rest at the origin of x-y coordinate system,is subjected to two forces,Fx in the positive x-direction,and Fy in the positive y-direction,whose time-varying magnitudes are shown in graphs below.What is the direction in which the object is travelling at t = 2 s?

Accepted Answer

A) 24.6º 
B) 36.6º 
C) 72.6º 
D) 81.6º 
E) 57.6º

Question 17

An elevator,with a total mass of 454 kg,accelerates downward at 3.51 m/s2.During this time,the tension in the elevator cable is

Accepted Answer

A) 1594 N. 
B) 2426 N. 
C) 2860 N. 
D) 3354 N. 
E) 4454 N.

Question 18

A sign (mass = 5.6 kg)is hanging from the ceiling on two threads of equal length,which make an angle of 79S1U1P1$\circ$S1S1P0 with each other.What is the tension in each thread?

Accepted Answer

A) 35.7 N 
B) 37.9 N 
C) 40.0 N 
D) 42.3 N 
E) 47.2 N

Question 19

A block slides down a frictionless incline and then flies into the air as shown.

Accepted Answer

A) The magnitude of the acceleration is the same during the entire motion including while it is in the air. 
B) The acceleration changes sign when the block leaves the incline. 
C) The magnitude of the acceleration is a maximum just after the block leaves the incline and then decreases. 
D) The magnitude of the acceleration is a maximum just after the block leaves the incline and then increases. 
E) The magnitude of the acceleration is a maximum just after the block leaves the incline and then stays constant.

Question 20

In order to straighten a crooked tree,a rope is attached horizontally from the top of the tree to a nearby building.A force of 600 N is applied downward at the center of rope.The angle between this downward force and the rope going to the tree is 95 degrees,which is the same as the angle between the downward force and the rope going to the building.The tension in the rope going to the tree is

Accepted Answer

A) 300 N. 
B) 600 N. 
C) 1200 N. 
D) 3442 N. 
E) 3658 N.

Exam 4: Force

A box slides down a frictionless inclined plane.Starting from rest,the box slides a distance of 0.73 m and reaches a speed of 2.1 m/s.What is the angle of inclination of the plane with respect to the horizontal?

The mass of an object is

A 5000-kg (= 11000 lb) truck needs to make an emergency stop.The truck is traveling at a speed of 30 m/s (= 67.5 mph) when the brakes are applied.How far does the truck travel assuming that the coefficient of kinetic friction is 0.7?

A mass m₁ of 4.00 kg slides on a frictionless surface.This mass is connected to another mass m₂ of 1.50 kg by a massless string over a frictionless pulley.The masses are held motionless and then released.After the masses are released,what is the tension in the string?

A mass,m₁ slides on a frictionless surface.This mass is connected to another mass m₂ of 5.00 kg by a massless string over a frictionless pulley.The masses are held motionless and then released.Mass m₂ accelerates downward at 4.10 m/s².What is the mass of m₁?

The mass in the picture below is sliding up the incline with no external forces applied.Which diagram for the forces along the incline is correct?

An 85.0-kg snowboarder slides down a frictionless slope inclined at an angle of 30^$\circ$.What is her acceleration?

A 1.23-kg box slides up an incline plane with a speed of 8.6 m/s.If the angle of the plane with respect to the horizontal is 11 degrees and the coefficient of friction is 0.33,how long will it take for the box to come to rest?

Two blocks,B1 and B2 with masses of 12.0 kg and 5.60 kg,respectively,are in contact with each other on a frictionless horizontal surface.A purely horizontal force of 30.0 N is applied to B1,which in turn pushes B2 and both blocks accelerate together uniformly.The net horizontal force acting on B2 is

A skydiver of mass 90.0 kg (including outfit and equipment) floats down suspended from his parachute,having reached terminal speed,8.35 m/s.The area of his parachute is 40.0 m² and the density of air is 1.15 kg/m³.The drag coefficient is

A skydiver of mass 90.0 kg (including outfit and equipment) floats down suspended from his parachute,having reached terminal speed of 12.3 m/s.The drag coefficient is 0.533,and the density of air is 1.15 kg/m³.The area of her parachute is

A box with a mass of 10 kg is sliding along the top of a rough,horizontal table at a speed of 30 m/s.The friction between the box and the table brings the box to rest in a time of 6.0 s.What is the coefficient of friction between the box and the table?

An object of mass m is at rest on a horizontal surface,and the coefficient of static friction is and kinetic friction .If a force F is applied to the object as shown and it remains at rest,then it must be true that

A 2.0-kg object,initially at rest at the origin of x-y coordinate system,is subjected to two forces,F_x in the positive x-direction,and F_y in the positive y-direction,whose time-varying magnitudes are shown in graphs below.What is the direction in which the object is travelling at t = 2 s?

An elevator,with a total mass of 454 kg,accelerates downward at 3.51 m/s².During this time,the tension in the elevator cable is

A block slides down a frictionless incline and then flies into the air as shown.

Exam 4: Force

A box slides down a frictionless inclined plane.Starting from rest,the box slides a distance of 0.73 m and reaches a speed of 2.1 m/s.What is the angle of inclination of the plane with respect to the horizontal?

The mass of an object is

A 5000-kg (= 11000 lb) truck needs to make an emergency stop.The truck is traveling at a speed of 30 m/s (= 67.5 mph) when the brakes are applied.How far does the truck travel assuming that the coefficient of kinetic friction is 0.7?

A mass m1 of 4.00 kg slides on a frictionless surface.This mass is connected to another mass m2 of 1.50 kg by a massless string over a frictionless pulley.The masses are held motionless and then released.After the masses are released,what is the tension in the string?

A mass,m1 slides on a frictionless surface.This mass is connected to another mass m2 of 5.00 kg by a massless string over a frictionless pulley.The masses are held motionless and then released.Mass m2 accelerates downward at 4.10 m/s2.What is the mass of m1?

The mass in the picture below is sliding up the incline with no external forces applied.Which diagram for the forces along the incline is correct?

An 85.0-kg snowboarder slides down a frictionless slope inclined at an angle of 30 ∘\circ∘ .What is her acceleration?

A 1.23-kg box slides up an incline plane with a speed of 8.6 m/s.If the angle of the plane with respect to the horizontal is 11 degrees and the coefficient of friction is 0.33,how long will it take for the box to come to rest?

A skydiver of mass 90.0 kg (including outfit and equipment) floats down suspended from his parachute,having reached terminal speed,8.35 m/s.The area of his parachute is 40.0 m2 and the density of air is 1.15 kg/m3.The drag coefficient is

A skydiver of mass 90.0 kg (including outfit and equipment) floats down suspended from his parachute,having reached terminal speed of 12.3 m/s.The drag coefficient is 0.533,and the density of air is 1.15 kg/m3.The area of her parachute is

A box with a mass of 10 kg is sliding along the top of a rough,horizontal table at a speed of 30 m/s.The friction between the box and the table brings the box to rest in a time of 6.0 s.What is the coefficient of friction between the box and the table?

An object of mass m is at rest on a horizontal surface,and the coefficient of static friction is and kinetic friction .If a force F is applied to the object as shown and it remains at rest,then it must be true that

A 2.0-kg object,initially at rest at the origin of x-y coordinate system,is subjected to two forces,Fx in the positive x-direction,and Fy in the positive y-direction,whose time-varying magnitudes are shown in graphs below.What is the direction in which the object is travelling at t = 2 s?

An elevator,with a total mass of 454 kg,accelerates downward at 3.51 m/s2.During this time,the tension in the elevator cable is

A sign (mass = 5.6 kg) is hanging from the ceiling on two threads of equal length,which make an angle of 79 ∘\circ∘ with each other.What is the tension in each thread?

A block slides down a frictionless incline and then flies into the air as shown.

A mass m₁ of 4.00 kg slides on a frictionless surface.This mass is connected to another mass m₂ of 1.50 kg by a massless string over a frictionless pulley.The masses are held motionless and then released.After the masses are released,what is the tension in the string?

A mass,m₁ slides on a frictionless surface.This mass is connected to another mass m₂ of 5.00 kg by a massless string over a frictionless pulley.The masses are held motionless and then released.Mass m₂ accelerates downward at 4.10 m/s².What is the mass of m₁?

An 85.0-kg snowboarder slides down a frictionless slope inclined at an angle of 30^$\circ$.What is her acceleration?

A skydiver of mass 90.0 kg (including outfit and equipment) floats down suspended from his parachute,having reached terminal speed,8.35 m/s.The area of his parachute is 40.0 m² and the density of air is 1.15 kg/m³.The drag coefficient is

A skydiver of mass 90.0 kg (including outfit and equipment) floats down suspended from his parachute,having reached terminal speed of 12.3 m/s.The drag coefficient is 0.533,and the density of air is 1.15 kg/m³.The area of her parachute is

A 2.0-kg object,initially at rest at the origin of x-y coordinate system,is subjected to two forces,F_x in the positive x-direction,and F_y in the positive y-direction,whose time-varying magnitudes are shown in graphs below.What is the direction in which the object is travelling at t = 2 s?

An elevator,with a total mass of 454 kg,accelerates downward at 3.51 m/s².During this time,the tension in the elevator cable is