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