Physics Ch.12 Test
A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above the Earth's surface. How much would she weigh there?
100 N
suppose the gravitational force between two spheres is 70 N. If the distance between the spheres is halved, what is the force between the masses?
140 N
An asteroid exerts a 360-N gravitational force on a nearby spacecraft. If the spacecraft moves to a point 3 times as far from the center of the asteroid, the force will be
40 N
what is the force of gravity on a 500 newton woman standing on the Earth's surface?
500 N
if the radius of the Earth somehow decreased with no change in mass, your weight would
increase
if the mass of the Earth somehow increased with no change in radius, your weight would
increase also
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
suppose the moon had twice as much mass as it no does and still orbited the earth at the same distance. In that case, the ocean bulges on Earth would be
larger
a lunar moon is about 28 days. If the moon were closer to Earth than it is now, the lunar month would be
less than 28 days
when high tides are not as high and low tides are not as low
neap tide
if the moon were four times as massive but twice as far from Earth, high tides on Earth would be
no different
if the sun somehow became twice as massive, your weight as normally measured here on Earth would
not change
if you drop a stone into a hole drilled all the way to the other side of Earth, the stone will _____.
speed up until it gets to the center of Earth
when the high tides are higher and the low tides are lower
spring tide
which is most responsible for ocean tides?
the moon
a planet has half the mass of the earth and half the radius. Compared to its weight on earth, an apple on this planet would weigh _____.
twice as much
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
what cartoon character almost fell into a black hole during film?
Homer Simpson
inside a freely falling elevator, there would be no
apparent weight for you
what continent enjoys the best surfing in December?
australia
on a given day, tides rise and fall at
different times and different distances almost everywhere
how far must one travel to get away from the Earth's gravitational field?
forget it; you can't travel far enough
Newton discovered that
gravity is universal
we do not observe tides in a community swimming pool because
all parts of it are practically the same distance from the moon
An object is placed exactly halfway between the Earth and moon. The object will fall toward the
Earth
The force of attraction between two masses depends inversely on the square of the distance between the masses. Any law that has this kind of dependence on distance is called an inverse distance law
False
the condition of weightlessness is the absence of gravity? (T or F)
False
the remains of a giant star that has undergone gravitational collapse
a black hole
a supplier wants to make a profit by buying metal by weight at one altitude and selling it at the same price per pound at another altitude. The supplier should
buy at high altitude and sell at a low altitude