physics ch 9

what is the force of gravity on a 500 N woman standing on the earth's surface?

500 N

We do not observe tides in a community swimming pool because

all parts of it are practically the same distance from the moon

Inside a freely falling elevator, there would be no

apparent weight for you

Inside a freely-falling runaway elevator, your

apparent weight is zero

the earth's gravitational field extends

both inside and outside the Earth and throughout the entire universe

If you drop a stone into a hole drilled all the way to the other side of Earth, the stone will

come to an abrupt stop at the center of earth

on a given day, tides rise and fall at

different times and different distances almost everywhere

according to newton, doubling the distance between two interacting objects

divides by 4 the gravitational force between them

An object is placed exactly halfway between the Earth and moon. The object will fall toward the

earth

how far must one travel to get away form the earth's gravitational field?

forget it, you can't travel far enough

according to newton, the greater the masses of interacting objects, the

greater the gravitational force between them

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

increase also

Two objects move toward each other due to gravity. As the objects get closer and closer, the force between them

increases

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

increases to four times as much

The main reason ocean tides exist is that the pull of the moon

is greater on oceans closer to the moon and less on oceans farther from the moon

The best time for digging clams (when the low tide is extra low) is during the time of the

new or full moon

all places on the earth would have high tides at the same instant if the

none of the above choices are correct

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

remains the same

a black hole is

simply the remains of a giant star that has undergone gravitational collapse

newton discovered

that gravity is universal

Which is most responsible for the ocean tides?

the moon

An asteroid exerts a 360-N gravitational force on a nearby spacecraft. This force is directed

toward the asteroid

Tidal forces in general are the result of

unequal forces acting on different parts of a body

The Earth is closer to the Sun in January than in July, which accounts for the fact that the highest high tides in the Northern Hemisphere occur in

winter

Half way to the center of a completely hollow planet with a thin uniform shell, your weight would be

zero