Physics chapter 12
If Earth were its present size but twice as massive , what would happen to our weight ?
double
Which is greater the gravitational force between Earth and the moon, or between Earth and the Sun ?
earth + sun
Why is it that it is so difficult to detect gravitational forces between ordinary objects ?
forces are to small or mass is too small
Suppose the gravitational force between two masses is 80 N. If the volume of each mass doubles, while everything else stays the same, what is the force between the masses ?
volume isn't in the equation
Is there a force on Earth that is directed toward the sun ?
yes, gravitational force
Consider the gravitational force between the earth and a meteor in outer space. If the meteor moves so its distance from the earth's center doubles, What happens to the gravitational force on the meteor? The gravitational force on the earth ?
1/4 as much
A 600 - N woman stands on top of a very tall ladder so she is one Earth radius above the Earth's surface. How much does she weigh ?
150 N
Suppose the gravitational force between two massive spheres is 80 N. If the distance between the spheres is doubled, what is the force between the masses ?
20 N (inverse square law)
Suppose the gravitational force between two massive spheres is 80 N. If the distance between the spheres is cut in half, what I the force between the masses ?
320 N
Suppose the gravitational force between two massive spheres is 80 N. If the magnitude of each mass doubles, what is the force between the masses ?
320 N
By noticing that Uranus's orbit is perturbed and by using the law of gravitation, two astronomers independently discovered what ?
Neptune
Because earth and moon are gravitationally attracted towards each other, will they soon collide
No because the tangential velocity
If Earth were to disappear would the moon still orbit the place where Earth was?
No it would fall because it would not have earths gravity to keep it moving
Does the force on a ball decrease as the ball moves farther from Earth ?
Yes because if U gets bigger F gets smaller
Why did Nellie Newton think there was a force acting on the moon
because the moon moves in a circular path
Since Earth is attracted to the sun, why doesn't it fall into the sun ?
because the planet has a tangential velocity
Why doesn't the moon fall into the Earth ?
because its has a sufficiency tangential velocity
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. Where should the supplier buy and where should he sell ?
buy on mountain sell on surface
If the radius of the earth decreased, with no change in mass, what would happen to your weight ?
increase
The force of attraction between two masses depends inversely on the square of the distance between the masses. Name the law?
inverse square law s
If earth's mass in decreased to 1/2 its original mass, with no change in radius, what would happen to your weight ?
it decreases 1/2 its original weight
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. Why is this ?
it has a larger radius than earth
A hollow spherical planet is inhabited by people who live inside it where the gravitational field is zero. When a very massive space ship lands on the planet surface, how does the gravitational field change within the planet ? why?
it is directed toward the spaceship
possible outcome for the universe
it will expand
If you stood atop a ladder on earth that was as tall as the earth's radius what would happen to your weight
it would be 1/4 because of inverse square law
If the mass of Earth increased , with no change in radius, what would happen to your weight
it would increase
Because Earth is "falling" around the sun, will it eventually fall into the sun?
it would only fall into the sun if its tangential velocity was zero
What did Newton hypothesize about the moon?
its a projectile falling at a fast rate around the earth
According to Newton's laws a rock and a pebble will fall at the same acceleration in a gravitational field . Explain this in terms of the mass to weight of the objects
mass : force
Compare the gravitational force between Earth and Mars, and the gravitational force between and newborn baby and the doctor who holds it.
not enough information is given
A lunar month is about 28 days. If the moon were closer to Earth than it is now, what would happen to length of the lunar month ?
shorter lunar month
In the real word, is the force of gravity on you greatest when you are standing on the earth's surface, slightly above the earth's surface, or slightly below the earth's on the earth's surface ?
slightly under your gravitational force is zero
What is the name of the component of an orbiting satellite's velocity that is parallel to Earth's surface
tangential velocity
Two objects move toward each other each other because of gravitational attraction. As the objects get closer and closer what happens to the force between them ?
the forces will be greater
Newton reasoned what relationship between gravitational attraction and the distance between objects like the Earth and the moon ?
the inverse square law
Why might we weigh a tiny bit less on the ground floor of a skyscraper than we do on the top floor ?
the mass on the building attacks you upward
Newton had an insight about the forces on the moon and an apple . What was it ?
they had the same
A very massive objects A and a less massive object B move toward each other under the influence of mutual gravitation. Which is greater, the force on A or B ?
they're the same
If you burrow deeply into a planet what will happen to the force of gravity on you ? What will happen if the planet's radius simply shrinks with you remaining on the surface
you will become less and the tone will be great
