Physics: ch. 9

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

A black hole is A. an empty region of space with a huge gravitational field. B. a small region that contains the mass of many galaxies C. simply the remains of a giant start that has undergone gravitational collapse

A. increase

If the radius of the Earth somehow decreased with no change in mass, your weight would A. increase B. not change C. decrease

C. not changed

If the sun somehow became twice as massive as your weight as normally measured here on earth would A. double B. quadruple C. not changed

B. apparent weight for you

Inside a freely falling elevator, there would be no A. gravitational force on you B. apparent weight for you C. both of these D. none of these

B. that gravity is universal

Newton discovered A. gravity B. that gravity is universal C.neither

A. in the same direction as the gravitational attraction

The direction of a gravitational field is A. in the same direction as the gravitational attraction B. Away from the center of gravity of an object C. opposite to the direction of gravitational attraction

C. the earth

The origin of any micro tides in the human body is most likely the A. sun B. moon C. earth

C. moon has a sufficient tangential speed

The reason the moon does not crash into the Earth is that the A. Earths gravitational field is weak at the moon B. gravitational pull of other planets keeps the moon up C. moon has a sufficient tangential speed D. moon has less mass than the Earth E. none of these

C. unequal forces acting on different parts of a body

Tidal forces in general are the result of A. two or more sources of gravitation B. a combination of any kind of forces acting on the body C. unequal forces acting on different parts of a body D. the inverse-square law E. unequal fluid flow

C. 500 N

What is the force of gravity on a 500-newton woman standing on the earth's surface? A. 50 N B.250 N C. 500 N D. 5000 N E. none of these

C. remains the same

When a star collapses to form a black hole, its mass A. increases B. decreases C. remains the same

D. increases to four times as much

When the distance between two stars decreased by half, the force between them A. decreases by one-quarter B. decreases by one-half C. increases to twice as much D. increases to four times as much E. stays the same

A. the moon

Which is most responsible for the oceans tides? A. the moon B. the sun C. both contribute equally

B. the melon

Which produces a greater tidal effect in your body, the moon or a 1-kg melon held above your head? A. the moon B. the melon C. not enough information is given to make a reasonable estimate

B. the sun

Which pulls on the oceans of the earth with greater force? A. the moon B. the sun C. both pull the same