Question 1

A Ferris wheel has diameter of 10 m and makes one revolution in 8.0 seconds.A person weighing 670 N is sitting on one of the benches attached at the rim of the wheel.What is the apparent weight (that is,the normal force exerted on her by the bench)of the person as she passes through the highest point of her motion?

Accepted Answer

The answer of A Ferris wheel has diameter of 10...

Question 2

Three objects are connected as shown in the figure.The strings and frictionless pulleys have negligible masses,and the coefficient of kinetic friction between the 2.0-kg block and the table is 0.25.What is the acceleration of the 2.0-kg block?

Accepted Answer

A)  2.5 m/  
B)  1.7 m/  
C)  3.2 m/  
D)  4.0 m/

Question 3

Which one of the following free-body diagrams best represents the free-body diagram,with correct relative force magnitudes,of a person in an elevator that is traveling upward but is gradually slowing down at a rate of  ?  f is the force of the floor on the person and  g is the force of gravity on the person.

Accepted Answer

A)   
B)   
C)   
D)   
E)

Question 4

A 6.00-kg block is in contact with a 4.00-kg block on a horizontal frictionless surface as shown in the figure.The 6.00-kg block is being pushed by a horizontal  force as shown.What is the magnitude of the force that the  block exerts on the  block?

Accepted Answer

A)  6.00 N 
B)  20.0 N 
C)  8.00 N 
D)  4.00 N 
E)  10.0 N

Question 5

A block is given a very brief push up a 20.0° frictionless incline to give it an initial speed of 12.0 m/s.
(a)How far along the surface of the plane does the block slide before coming to rest?
(b)How much time does it take to return to its starting position?

Accepted Answer

The answer of A block is given a very brief...

Question 6

A 50.0-kg block is being pulled up a 16.0° slope by a force of 250 N which is parallel to the slope.The coefficient of kinetic friction between the block and the slope is 0.200.What is the magnitude of the acceleration of the block?

Accepted Answer

A)  0.528 m/  
B)  0.158 m/  
C)  0.412 m/  
D)  0.983 m/  
E)  0.260 m/

Question 7

Two blocks are connected by a string that goes over an ideal pulley as shown in the figure.Block A has a mass of 3.00 kg and can slide over a rough plane inclined 30.0° to the horizontal.The coefficient of kinetic friction between block A and the plane is 0.400.Block B has a mass of 2.77 kg.What is the acceleration of the blocks?

Accepted Answer

A)  0.392 m/s2 
B)  1.96 m/s2 
C)  3.12 m/s2 
D)  5.35 m/s2 
E)  0.00 m/s2

Question 8

Two weights are connected by a massless wire and pulled upward with a constant speed of 1.50 m/s by a vertical pull P.The tension in the wire is T (see figure).Which one of the following relationships between T and P must be true?

Accepted Answer

A)  T > P 
B)  T = P 
C)  P + T = 125 N 
D)  P = T + 25 N 
E)  P = T + 100 N

Question 9

A 1520-N crate is to be held in place on a ramp that rises at 30.0° above the horizontal (see figure).The massless rope attached to the crate makes a 22.0° angle above the surface of the ramp.The coefficients of friction between the crate and the surface of the ramp are  and  .The pulley has no appreciable mass or friction.What is the MAXIMUM weight w that can be used to hold this crate stationary on the ramp?

Accepted Answer

The answer of A 1520-N crate is to be held...

Question 10

A 30.0-kg object experiences a drag force due to air resistance with a magnitude proportional to the square of its speed.The object falls with an acceleration of  downward when it is falling downward at  .What is its terminal speed?

Accepted Answer

A)  110 m/s 
B)  157 m/s 
C)  91.0 m/s 
D)  172 m/s 
E)  108 m/s

Question 11

Two weights are connected by a massless wire and pulled upward with a constant speed of 1.50 m/s by a vertical pull P.The tension in the wire is T (see figure).P is closest to

Accepted Answer

A)  25 N. 
B)  125 N. 
C)  187.5 N. 
D)  245 N. 
E)  1225 N.

Question 12

Kieran takes off from rest down a 50 m high,10° slope on his jet-powered skis.The skis have a thrust of 280 N parallel to the surface of the slope.The combined mass of skis and Kieran is 50 kg (the fuel mass is negligible).Kieran's speed at the bottom is 40 m/s.What is the coefficient of kinetic friction of his skis on snow?

Accepted Answer

A)  0.47 
B)  0.58 
C)  0.23 
D)  0.29

Question 13

A roadway for stunt drivers is designed for racecars moving at a speed of  .A curved section of the roadway is a circular arc of 230 m radius.The roadway is banked so that a vehicle can go around the curve with the friction force from the road equal to zero.At what angle is the roadway banked?

Accepted Answer

A)  35° 
B)  37° 
C)  33° 
D)  31° 
E)  29°

Question 14

A 615 N student standing on a scale in an elevator notices that the scale reads  .From this information,the student knows that the elevator must be moving

Accepted Answer

A)  downward. 
B)  upward. 
C)  You cannot tell if it is moving upward or downward.

Question 15

The figure shows a 100-kg block being released from rest from a height of 1.0 m.It then takes it 0.90 s to reach the floor.What is the mass m of the other block? The pulley has no appreciable mass or friction.

Accepted Answer

A)  60 kg 
B)  54 kg 
C)  48 kg 
D)  42 kg

Question 16

A ship is being pulled through a harbor at constant velocity by two tugboats as shown in the figure.The lines attached to the two tugboats have the same tension of 200,000 N.Each line makes an angle of 28.0° with the direction the ship is being towed.What is the magnitude of the drag force due to the water on the ship?

Accepted Answer

A)  177 × 105 N 
B)  1.88 × 105 N 
C)  93.9 × 104 N 
D)  zero 
E)  3.53 × 105 N

Question 17

A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle.The coefficients of static and kinetic friction between the hockey puck and the metal ramp are  and  ,respectively.The puck's initial speed is  .What vertical height does the puck reach above its starting point?

Accepted Answer

A)  130 m 
B)  270 m 
C)  200 m 
D)  66 m

Question 18

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s.The vector sum of all the forces acting on this crate must point down the ramp.

Accepted Answer

A) True 
 B)False

Question 19

A brick is resting on a rough incline as shown in the figure.The friction force acting on the brick,along the incline,is

Accepted Answer

A)  zero. 
B)  equal to the weight of the brick. 
C)  greater than the weight of the brick. 
D)  less than the weight of the brick.

Question 20

A 60.0-kg person rides in an elevator while standing on a scale.The scale reads  .The acceleration of the elevator is closest to

Accepted Answer

A)  3.13 m/s2 downward. 
B)  6.67 m/s2 downward. 
C)  zero. 
D)  9.80 m/s2 downward. 
E)  6.67 m/s2 upward.

Exam 5: Applying Newtons Laws

Three objects are connected as shown in the figure.The strings and frictionless pulleys have negligible masses,and the coefficient of kinetic friction between the 2.0-kg block and the table is 0.25.What is the acceleration of the 2.0-kg block?

A 6.00-kg block is in contact with a 4.00-kg block on a horizontal frictionless surface as shown in the figure.The 6.00-kg block is being pushed by a horizontal force as shown.What is the magnitude of the force that the block exerts on the block?

A block is given a very brief push up a 20.0° frictionless incline to give it an initial speed of 12.0 m/s. (a)How far along the surface of the plane does the block slide before coming to rest? (b)How much time does it take to return to its starting position?

A 50.0-kg block is being pulled up a 16.0° slope by a force of 250 N which is parallel to the slope.The coefficient of kinetic friction between the block and the slope is 0.200.What is the magnitude of the acceleration of the block?

Two weights are connected by a massless wire and pulled upward with a constant speed of 1.50 m/s by a vertical pull P.The tension in the wire is T (see figure) .Which one of the following relationships between T and P must be true?

A 30.0-kg object experiences a drag force due to air resistance with a magnitude proportional to the square of its speed.The object falls with an acceleration of downward when it is falling downward at .What is its terminal speed?

Two weights are connected by a massless wire and pulled upward with a constant speed of 1.50 m/s by a vertical pull P.The tension in the wire is T (see figure) .P is closest to

A roadway for stunt drivers is designed for racecars moving at a speed of .A curved section of the roadway is a circular arc of 230 m radius.The roadway is banked so that a vehicle can go around the curve with the friction force from the road equal to zero.At what angle is the roadway banked?

A 615 N student standing on a scale in an elevator notices that the scale reads .From this information,the student knows that the elevator must be moving

The figure shows a 100-kg block being released from rest from a height of 1.0 m.It then takes it 0.90 s to reach the floor.What is the mass m of the other block? The pulley has no appreciable mass or friction.

A 200 g hockey puck is launched up a metal ramp that is inclined at a 30° angle.The coefficients of static and kinetic friction between the hockey puck and the metal ramp are and ,respectively.The puck's initial speed is .What vertical height does the puck reach above its starting point?

A crate is sliding down an inclined ramp at a constant speed of 0.55 m/s.The vector sum of all the forces acting on this crate must point down the ramp.

A brick is resting on a rough incline as shown in the figure.The friction force acting on the brick,along the incline,is

A 60.0-kg person rides in an elevator while standing on a scale.The scale reads .The acceleration of the elevator is closest to