An object slows down in such a way that its acceleration is constant. What can we say about the force acting on the object?

A)

there is no force acting on it

B)

the force acting on it is constant

C)

the force acting on it increases steadily

D)

the force acting on it decreases steadily

2

Suppose an object moves in a circular path at constant speed. What can be said about the force acting on it?

A)

there is no force acting on it

B)

the force acting on it must constantly vary in strength

C)

the force acting on it has constant strength

D)

the forces acting on it must act in opposite directions

3

A mass of 50 kgs is acted on by a force of 200 dynes. The motion of the object subsequently will be

A)

motion at a constant speed of 0.25 cm/sec

B)

acceleration at a rate of 4 cm/sec/sec.

C)

acceleration at a rate of 200 cm/sec/sec

D)

motion at a constant speed of 50 cm/sec

4

When a force is applied to a body with a mass of 10 kg, the acceleration of the body is 1 m/s/s. If the same force is applied to a body with a mass of 40 kg, what is the acceleration of the body?

A)

0.25 m/s/s

B)

1 m/s/s

C)

4 m/s/s

D)

16 m/s/s

5

The force required to keep an object in a circular orbit is directed

A)

directly away from the center of the circle

B)

in the direction in which the object is moving

C)

in the direction opposite to that in which the object is moving

D)

toward the center of the circle

6

If the masses of the sun and Earth each were tripled, the force of gravity between them would

A)

remain the same

B)

triple

C)

becomes 6 times as large

D)

becomes 9 times as large

7

Suppose there is a planetary system in which a planet with an average distance of 6 AU from the star has an orbital period of 3 years. What is the mass of the star?

A)

2 solar masses

B)

8 solar masses

C)

18 solar masses

D)

24 solar masses

8

A comet has a speed which is slightly smaller than escape velocity. What path around the sun will the comet follow?

A)

a circle

B)

an ellipse

C)

a parabola

D)

a hyperbola

9

Why does the Earth have a tidal bulge on the side of the Earth which is opposite the moon?

A)

lunar gravity is weakest there

B)

there is another object pulling on the Earth in that direction

C)

the Earth rotates fastest on that side

D)

that is where the moon's repulsive force is strongest

10

As a consequence of tides

A)

the day is lengthening, the month growing shorter

B)

the day is lengthening, the month lengthening

C)

the day is growing shorter, the month lengthening

D)

the day is growing shorter, the month growing shorter

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