AP (Advanced Placement) Physics(B-C): Questions 75 - 77 of 920

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Question number: 75

» Gravitation and Circular Motion

MCQ▾

Question

A ball is whirled in a vertical circular path at a constant speed of . When the ball is at the bottom of the path, the string is cut. The ball will subsequently:

Choices

Choice (5) Response

a.

take a parabolic path to the floor and hit the floor at

b.

drop vertically to the floor and hit the floor at a speed greater than

c.

take a parabolic path to the floor and hit the floor at a speed greater than

d.

drop vertically to the floor and hit the floor at a speed less than

e.

None of the above

Question number: 76

» Electrostatics

MCQ▾

Question

The electrostatic force between two charged objects is . If the objects are moved four times as far as before, what is the new force?

Choices

Choice (5) Response

a.

b.

c.

d.

e.

Question does not provide sufficient data or is vague

Question number: 77

» Force and Newton's Law of Motion

MCQ▾

Question

Which of the following statements is true regarding the coefficient of friction between an object and a level surface?

Choices

Choice (5) Response

a.

As the object moves across the surface, the coefficient of friction decreases as the object slows down.

b.

If the object is stationary the coefficient of friction is generally less than . And if the object is moving and more than .

c.

The coefficient of friction is generally less if the object rolls than if the object slides across the surface.

d.

The coefficient of static friction is generally less than the coefficient of kinetic friction.

e.

None of the above

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