Physics Ch.9 Test
different times and different distances almost everywhere
on a given day, tides rise and fall at
140 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?
larger
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
False
the condition of weightlessness is the absence of gravity? (T or F)
is greater on oceans closer to the moon and less on oceans farther from the moon
the main reason ocean tides exist is that the pull of the moon
all parts of it are practically the same distance from the moon
we do not observe tides in a community swimming pool because
Homer Simpson
what cartoon character almost fell into a black hole during film?
forget it; you can't travel far enough
how far must one travel to get away from the Earth's gravitational field?
increase also
if the mass of the Earth somehow increased with no change in radius, your weight would
no different
if the moon were four times as massive but twice as far from Earth, high tides on Earth would be
increase
if the radius of the Earth somehow decreased with no change in mass, your weight would
not change
if the sun somehow became twice as massive, your weight as normally measured here on Earth would
speed up until it gets to the center of Earth
if you drop a stone into a hole drilled all the way to the other side of Earth, the stone will _____.
apparent weight for you
inside a freely falling elevator, there would be no
winter
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
a black hole
the remains of a giant star that has undergone gravitational collapse
australia
what continent enjoys the best surfing in December?
500 N
what is the force of gravity on a 500 newton woman standing on the Earth's surface?
neap tide
when high tides are not as high and low tides are not as low
spring tide
when the high tides are higher and the low tides are lower
the moon
which is most responsible for ocean tides?
100 N
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?
40 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
Earth
An object is placed exactly halfway between the Earth and moon. The object will fall toward the
gravity is universal
Newton discovered that
False
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
less than 28 days
a lunar moon is about 28 days. If the moon were closer to Earth than it is now, the lunar month would be
twice as much
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 _____.
buy at high altitude and sell at a low altitude
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
