# AP (Advanced Placement) Physics(B-C): Questions 38 - 41 of 921

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## Question number: 38

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MCQ▾

### Question

A meter stick with a mass of balances horizontally when a pivot is placed at the middle (on the mark). When an unknown object is placed at the mark, the pivot must be moved to the mark for the system to balance (Shown in figure). What is the mass of the unknown object?

### Choices

Choice (5)Response

a.

b.

c.

d.

e.

All of the above

## Question number: 39

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MCQ▾

### Question

The moon’s mass is about one sixth that of Earth. Compared to the gravitational force that Earth exerts on the moon, the gravitational force that the moon exerts on Earth is

### Choices

Choice (5)Response

a.

twice as much

b.

one half as much

c.

the same

d.

one sixth as much

e.

All of the above

## Question number: 40

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MCQ▾

### Question

A long screwdriver is used to try open the lid of paint can. The person applies a downward force of at the handle end of the screwdriver and supports the screwdriver on the edge of the can from the screwdriver’s tip. What is the force required to lift open the paint can without the screwdriver?

### Choices

Choice (5)Response

a.

b.

c.

d.

e.

Question does not provide sufficient data or is vague

## Question number: 41

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MCQ▾

### Question

An object at the end of a string is whirled in a horizontal circle at constant speed, as in the diagram. If the mass of the object is grams and the angle is equal to , which of the following expressions allows you to solve for the tension in the string in Newton?

### Choices

Choice (5)Response

a.

b.

c.

d.

e.

Question does not provide sufficient data or is vague

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