# AP (Advanced Placement) Physics(B-C): Questions 283 - 286 of 921

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## Question number: 283

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MCQ▾

### Question

The speed of air moving over the top of a thin airfoil, such as an airplane wing, is , and the speed of air moving under the airfoil is . If the area of surface is approximately , what is the lift force on the airfoil due to the moving air?

(Assume the density of air is . )

### Choices

Choice (5)Response

a.

b.

c.

d.

e.

None of the above

## Question number: 284

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MCQ▾

### Question

The circuit in the diagram shows five identical lightbulbs connected to a battery. If each bulb has a resistance of , find the equivalent (total) resistance of the five bulbs.

### Choices

Choice (5)Response

a.

b.

c.

d.

e.

Question does not provide sufficient data or is vague

## Question number: 285

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MCQ▾

### Question

A metal ruler is made of a material that has a coefficient of linear expansion of . If the ruler is heated from to , by what percentage does the length of one centimeter on the ruler increase?

### Choices

Choice (5)Response

a.

Less than

b.

Between and

c.

d.

Between and

e.

None of the above

## Question number: 286

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MCQ▾

### Question

The graph displays data for a force applied to a spring. How much work is done on the spring by the applied force in extending the spring a distance of ?

### Choices

Choice (5)Response

a.

b.

The work cannot be determined without knowing the elastic constant of the spring.

c.

d.

e.

None of the above

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