# AP (Advanced Placement) Physics(B-C): Questions 359 - 360 of 921

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## Question number: 359

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MCQ▾

### Question

When automobiles have to stop quickly, injury to occupants can be reduced by using air bags. What is the primary mechanism by which an air bag reduces injury?

### Choices

Choice (5)Response

a.

An air bag increases the time it takes to stop the person, so the force on the person is less.

b.

An air bag increases the distance over which the person comes to a stop, so the acceleration is larger.

c.

An air bag is soft, so it absorbs the force of the impact.

d.

An air bag applies a force on the person in the opposite direction from the force that the car is exerting on the person, so the net force on the person is less.

e.

None of the above

## Question number: 360

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MCQ▾

### Question

In the illustration, the smaller air-core solenoid (coil of wire) on the left is inserted into the larger air-core solenoid on the right without allowing any of the connecting wires to touch. The larger solenoid is connected to a battery, but the smaller solenoid is connected only to an ammeter to read the current in the smaller solenoid. After the smaller solenoid is inside the larger one, the current is turned on. There is a quick reading on the ammeter, but the reading goes to zero. To maintain a reading on the ammeter, which of the following actions would be effective?

### Choices

Choice (5)Response

a.

Replace the smaller solenoid with a solenoid of the same diameter but with twice as many wire turns.

b.

Reconnect the larger solenoid to an alternating current (AC) power supply.

c.

Move both solenoids to the right and keep them moving to the right at the same speed.

d.

Place an iron core inside the smaller solenoid.

e.

Question does not provide sufficient data or is vague

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