AP (Advanced Placement) Physics(B-C): Questions 238 - 239 of 921

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Question number: 238

» Work, Energy and Power

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MCQ▾

Question

Which of the following statements is true regarding NON CONSERVATIVE FORCES?

Choices

Choice (5)Response

a.

The gravitational force is non conservative, because the path taken by an object is always in the same direction as the gravitational force exerted on the object.

b.

The gravitational force is non – conservative, because it increases on an object as the object moves closer to Earth’s center.

c.

The friction force is non conservative, because mechanical energy is converted to thermal energy.

d.

The friction force is non conservative, because work done by friction is always independent of the path taken.

e.

Question does not provide sufficient data or is vague

Question number: 239

» Thermodynamics

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MCQ▾

Question

The thermal conductivity of water is , and that of oil is , and that of oil is of alcohol . Students are designing a container to maintain a constant temperature of a beaker of boiling water inside the container. The students decide to set the beaker into a liquid bath. With which of the following actions would the students be most successful in keeping the water boiling?

Choices

Choice (5)Response

a.

Set the beaker into water at .

b.

Set the beaker into oil at .

c.

Set the beaker into alcohol at .

d.

Set the beaker into water at .

e.

All of the above

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