Question 1

A 2-kg block of ice slides frictionlessly down a plane inclined at 22S1U1P1$\circ$S1S1P0 a distance of 2 m.What is the normal force on the block of ice?

Accepted Answer

A) 3.0 N 
B) 18.2 N 
C) 7.3 N 
D) 0 N 
E) 39.2 N 
A) 3.0 N 
B) 18.2 N 
C) 7.3 N 
D) 0 N 
E) 39.2 N

Question 2

Two forces are acting on an object and are shown in the diagram below.What is the net force acting on this object? Measure the direction counterclockwise from the 15 N force.

Accepted Answer

A) 21.8 N at 23.4o 
B) 24.2 N at 40.0o 
C) 5.0 N at 20.0o 
D) 24.2 N at 11.9o 
E) 25.0 N at 20.0o 
A) 21.8 N at 23.4o 
B) 24.2 N at 40.0o 
C) 5.0 N at 20.0o 
D) 24.2 N at 11.9o 
E) 25.0 N at 20.0o

Question 3

An elevator's cable can handle a tension of 95,500N.Assuming the car has a mass of 2950 kg and it is carrying a full load of passengers whose combined mass is 3750 kg,what is the minimum time required for the elevator to rise 50.0 m from rest?

Accepted Answer

A) 2.65 s 
B) 3.35 s 
C) 4.74 s 
D) 5.96 s 
A) 2.65 s 
B) 3.35 s 
C) 4.74 s 
D) 5.96 s

Question 4

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.While m2 is accelerating downward,what is the magnitude of the tension in the string (within 5% accuracy)?

Accepted Answer

A) 57 N 
B) 49 N 
C) 69 N 
D) 80 N 
E) 5 
A) 57 N 
B) 49 N 
C) 69 N 
D) 80 N 
E) 5

Question 5

Given that the gravitational acceleration on the surface of the Moon is one-sixth that on the surface of the Earth,which of the following objects has the most mass?

Accepted Answer

A) a 1-kg object on the Earth 
B) a 6-kg object on the Moon 
C) a 6-kg object on the Earth 
D) a 36-kg object on the Moon 
A) a 1-kg object on the Earth 
B) a 6-kg object on the Moon 
C) a 6-kg object on the Earth 
D) a 36-kg object on the Moon

Question 6

A 0.5-kg model helicopter initially at rest on the ground,starts to move directly up under the effect of a lift force of magnitude of 7.4 N.After 12 seconds the engine stops and the helicopter starts free fall.Ignoring air resistance,calculate the helicopter's velocity just before hitting the ground.

Accepted Answer

A) -36.7 m/s 
B) -48.4 m/s 
C) -65.5 m/s 
D) -103 m/s 
E) -116 m/s 
A) -36.7 m/s 
B) -48.4 m/s 
C) -65.5 m/s 
D) -103 m/s 
E) -116 m/s

Exam 4: Force

A 2-kg block of ice slides frictionlessly down a plane inclined at 22 ∘\circ∘ a distance of 2 m.What is the normal force on the block of ice?

Two forces are acting on an object and are shown in the diagram below.What is the net force acting on this object? Measure the direction counterclockwise from the 15 N force.

An elevator's cable can handle a tension of 95,500N.Assuming the car has a mass of 2950 kg and it is carrying a full load of passengers whose combined mass is 3750 kg,what is the minimum time required for the elevator to rise 50.0 m from rest?

Given that the gravitational acceleration on the surface of the Moon is one-sixth that on the surface of the Earth,which of the following objects has the most mass?

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A 2-kg block of ice slides frictionlessly down a plane inclined at 22^$\circ$ a distance of 2 m.What is the normal force on the block of ice?