question

What happens to the force of distraction between two planets when the distance between them is doubled?

answer

The force decreases to one quarter

question

Suppose you are in an elevator. As the elevator starts upward, its speed will increase. During this time when the elevator is moving upward with increasing speed, your weight will be

answer

Greater than your normal weight at rest

question

Suppose you are in an elevator that is moving upward. As the elevator nears the floor at which you will get off, its speed slows down. During this time when the elevator is moving upward with decreasing speed, your weight will be

answer

Less than your normal weight at rest

question

As you found in Part A, your weight will be greater than normal when the elevator is moving upward with increasing speed. For what other motion would your weight also be greater than your normal weight?

answer

The elevator moves downward while slowing in speed

question

If you are standing on a scale in an elevator, what exactly does the scale measure?

answer

The force you exert on the scale

question

How does the gravity in the space shuttle compare with the gravity on Earths surface?

answer

The gravity in the space shuttle is approximately equal to the gravity on the surface of the Earth

question

Why does the gravity in the space shuttle compare with the gravity on Earth the way it does?

answer

The space shuttle is about the same distance from the center of the Earth than from the surface of the Earth

question

Why do the astronauts in the space shuttle float around?

answer

The space shuttle is in free fall so the shuttle and the astronauts inside it are continuously falling toward the Earth. They thus experience apparent weightlessness.

question

Each day

answer

There are two high tides and two low tides

question

THe moons gravitational pull is

answer

Strongest on the side of Earth closest to the moon

question

Approximately how much time passes between low and high tide?

answer

6 hours

question

A high tide can occur

answer

When the moon is high overhead

question

If there were no moon would there still be tides on earth?

answer

Yes because the suns gravity still has an influence

question

How do the high tides during a full moon compare to high tides during a new moon?

answer

The high tides during a full moon are roughly the same as the high tides during the new moon

question

Which of the following lists correctly gives in increasing order, the height of the high tides that occur during particular lunar phases?

answer

(First quarter, third quarter) (New,full)

question

Einstein's theory of gravitation, compared with Newtons

answer

Eliminates the role of force

question

From the viewpoint of an observer in the orbiting rocket, what happens to time on the other rocket as it falls toward the event horizon of the black hole?

answer

Time runs increasingly slower as the rocket approaches the black hole

question

As the failing rocket plunges toward the event horizon, an observer in the orbiting rocket would see that the falling rocket

answer

Slows down as it approaches the event horizon and never actually crosses the event horizon

question

From Part B, you know that from afar we'll never see the in-failing rocket cross the event horizon, yet it will still eventually disappear from view. Why?

answer

Its light will become so redshifted that it will be undetectable

question

If you were inside the rocket that falls toward the event horizon, you would notice your own clock to be running

answer

At a constant normal rate as you approach the event horizon

question

If you were inside the rocket that falls toward the event horizon, from your own viewpoint you would

answer

Accelerate as you fall and cross the event horizon completely unhindered

question

Where does an object on an elliptical orbit experience the greatest acceleration?

answer

Where spacetime has the most curvature

question

Imagine that the sun could be turned into a black hole without changing its mass. How would Earths orbit change?

answer

Earths orbit would not change

question

Imagine that the sun gained mass without changing its radius. How would the structure of spacetime change at the distance of Earths orbit?

answer

Spacetime would become more curved at Earths orbit

question

Black holes are essentially

answer

Collapsed stars

question

Is gravitational force acting on a person who falls off a cliff?

answer

Yes

question

Is gravitational force acting on an astronaut inside an orbiting space shuttle?

answer

Yes

question

Newton discovered

answer

That gravity is universal

question

According to Newton, doubling the distance between to interacting objects

answer

Divides by 4 the gravitational force between them

question

What is the force of gravity on a 500 newton woman standing on the earths surface?

answer

500 N

question

If the mass of the earth somehow increased with no change in radius, your weight would

answer

Increase also

question

Inside a freely falling elevator, there would be no

answer

Apparent weight for you

question

The earths gravitational field extends

answer

Both inside and outside the earth and throughout the entire universe

question

A black hole

answer

Simply the remains of a giant star that has undergone gravitational collapse

question

An astroid exerts a 360 N gravitational force on a nearby spacecraft. This force is directed

answer

Toward the astroid

question

An astroid exerts a 360 N gravitational force on a nearby force on a nearby spacecraft. If the spacecraft moves to a position three times as far from the center of the asteroid, the forces will be

answer

40 N

question

An object is placed exactly halfway between the Earth and moon. The object will fall toward the

answer

Earth

question

The amount of gravitational force that acts on the space shuttle while in orbit is

answer

Almost as much as the shuttles weight on the earths surface

question

A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above the Earths surface. How much would she weight there?

answer

100 N

question

Two objects move toward each other because of gravity. As the objects get closer and close, the force between them

answer

Decreases, then increases

question

The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. These twice as high apples, for the same mass have

answer

Practically the same weight

question

Half way to the center of a completely hollow planet with a thin uniform shell, your weight would be

answer

Zero

question

Inside a freely falling runaway elevator, your

answer

Apparent weight is zero

question

No force due to earths gravity is acting on the astronauts inside the orbiting space shuttle. This statement is

answer

Always false

question

The factor most directly responsible for making a black hole invisible is its

answer

Surface escape velocity

question

When a star collapses to form a black hole, its mass

answer

Remains the same

question

How far must one travel to get away from the Earths gravitational field?

answer

Forget it, you cant travel far enough

question

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 planets surface, inhabitants, fins that the gravitational field inside the planet is

answer

Non zero, directed toward the spaceship

question

Which pulls on the oceans of the Earth with the greater force?

answer

The Sun

question

Which is most responsible for the ocean tides?

answer

The moon

question

The main reason ocean tides exist is that the pull of the moon

answer

Is greater on oceans closer to the moon and less on oceans farther from the moon

question

If the earths mass decreased to one half its original mass with no change in radius, then your weight would

answer

Decrease to one half your original weight

question

A very massive object A and a less massive object B move toward each other under the influence of gravitation. Which force, if either, is greater?

answer

Both the force on A and B

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