chapter 13 physics
Suppose the gravitational force between two spheres is 100 N. If the distance between the spheres is halved what is the force between the masses
400 N
Jupiter has more than 300 times the mass of Earth. Yet on Jupiter's surface an object weighs only about 3 times as much as it would on Earth. The explanation to this involves Jupiter's
Large radius
since earth is attracted to the sun, why doesn't it fall into the sun?
because it has sufficient tangential velocity
A very massive object A and a less massive object B move toward each other under the influence of gravitations. Which force, if either, is greater?
both forces are the same
Newton had the insight to see that the
force on the moon has the same nature as the force on an apple
gravitational forces are the weakest forces found in nature, because of this
gravitational forces that are easily observed involve one or more large masses
Newton realized that the moon is attracted to earth just like an apple, However the moon _______ so it will not hit the earth but will remain in orbit
has tangential velocity that prevents it from falling into Earth
A lunar month is about 28 days. If the moon were closer to earth than it is now, the lunar month would be
less than 28 days
if you weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight you would weigh
more
Consider the gravitational force between earth and a meteor in outer space. if the meteor moves so its distance from the earth's center doubles, the gravitational force on the meteor will be
one quarter
if you stood atop a ladder on earth that was as tall as earth's radius, your weight atop the ladder would be
one quarter its normal value
If the sun were to collapse to form a black hole, earth would?
orbit the black hole just as it orbits the sun now
Newton reasoned that the gravitational attraction between the earth and the moon must
reduced by distance
when a star collapses to form a black hole, its mass
remains the same
if you drop a stone into a hole drilled all the wall to the other side of earth, the stone will
speed up until it gets to the center of earth
the reason the moon doesn't fall into earth is that
the moon has a sufficiently large orbital speed
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 gravitational field strength at the center of Earth is _____
zero
if a weight scale shows that you weigh 200 kg on the surface of Earth, and then you skydive with both of your feet attached to the scale, you will read a weight of
0 kg
Suppose the gravitational force between two spheres is 30 N. If the mass of each sphere doubled, the new force between them would be
120 N
Suppose the gravitational force between the two massive spheres is 100 N. If the distance between the spheres is doubled, what is the force between the masses
25 N
Suppose the gravitational force between two masses is 70 N. If the magnitude of one of the masses halves what is the force between the masses?
35 N
which is greater, the gravitational force between Earth and the moon, or the gravitational force between the Earth and the sun?
Earth-Sun
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 ______
come up with a different plan because it has too small of an effect to make a difference
If Earth's mass decreased to one half its original mass, with no change in radius, then your weight would _______
decrease to one half of your original weight
if the radius of Earth decreased with no change in mass, your weight would
increase
If the mass of the Earth somehow increased with no change in radius, how would your weight change?
increase also
Two objects move toward each other because of gravitational attraction. As the objects get closer and closer, the force between them
increases
The gravitational force between two massive spheres
is always an attraction
