# AP (Advanced Placement) Physics(B-C): Questions 124 - 127 of 921

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## Question number: 124

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MCQ▾

### Question

A string of negligible mass connects three blocks on a level surface, as shown in the illustration. A force of is exerted on the block, and the friction force on each block is . What is the acceleration of block of mass ?

### Choices

Choice (5)Response

a.

b.

c.

d.

e.

None of the above

## Question number: 125

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MCQ▾

### Question

Three objects are shown on the grid, with the mass and coordinates of each object labeled. What are the coordinates of the center of mass of the system of the three objects?

### Choices

Choice (5)Response

a.

b.

c.

d.

e.

None of the above

## Question number: 126

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MCQ▾

### Question

A stone thrown straight upward has an acceleration that is:

### Choices

Choice (5)Response

a.

Smaller than that of a stone thrown straight downward

b.

Zero until it reaches the highest point in its path

c.

Greater than that of a stone thrown straight downward

d.

The same as that of a stone thrown straight downward

e.

All of the above

## Question number: 127

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MCQ▾

### Question

The illustration shows a pulley system designed to lift an object of mass . The system consists of a fixed pulley attached to the ceiling and a movable pulley to which the object is attached. What is the force that a person has to exert downward on the rope in order to lift the object at constant speed?

### Choices

Choice (5)Response

a.

b.

c.

d.

e.

None of the above

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