Physics: ch. 9

The direction of a gravitational field is

A. in the same direction as the gravitational attraction

If the radius of the Earth somehow decreased with no change in mass, your weight would

A. increase

Which is most responsible for the oceans tides?

A. the moon

Inside a freely falling elevator, there would be no

B. apparent weight for you

Newton discovered

B. that gravity is universal

Which produces a greater tidal effect in your body, the moon or a 1-kg melon held above your head?

B. the melon

Which pulls on the oceans of the earth with greater force?

B. the sun

What is the force of gravity on a 500-newton woman standing on the earth's surface?

C. 500 N

The reason the moon does not crash into the Earth is that the

C. moon has a sufficient tangential speed

If the sun somehow became twice as massive as your weight as normally measured here on earth would

C. not changed

When a star collapses to form a black hole, its mass

C. remains the same

A black hole is

C. simply remains of a giant start that has undergone gravitational collapse

The origin of any micro tides in the human body is most likely the

C. the earth

Tidal forces in general are the result of

C. unequal forces acting on different parts of a body

When the distance between two stars decreased by half, the force between them

D. increases to four times as much