Gravity Practice Test

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

A. Earth

Since Earth is attracted to the sun, why doesn't it fall into the sun

A. because it has sufficient tangential velocity

The speed of a satellite in a circular orbit is

A. constant

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

A. increases

if the sun were to collapse to form a black hole (quite unlikely), Earth would

D. orbit the black hole just as it orbits the sun now

Because Earth is falling around the sun, it will eventually crash into it

False

The gravitational force of Earth on an object does not depend upon the object's mass

False

An Earth satellite is a projectile that falls around Earth instead of falling into it

True

For some massive stars, gravitational collapse doesn't stop until the density of the star becomes so enormous that even light cannot escape. Such a star becomes a black hole

True

The force on a ball decreases as the ball moves farther from Earth

True

The place in a satellite's orbit where the satellite is closest to Earth is the perigee

True

The place in a satellite's orbit where the satellite is farthest from Earth is the apogee

True

The curvature of Earth is such that for every 8000 m tangent to the surface, the surface drops about

a. 5m

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

a. remains the same

If you were to weigh yourself in an elevator that is in free fall, compared to your ordinary weight, you would weigh

a. zero

An object dropped from rest almost infinitely far from Earth falls to Earth because of Earth's gravitational field, and strikes the surface with a speed of about

b. 11 km/s

What remains constant for a satellite in elliptical orbit

b. its total energy

Minimal orbital speed about Earth is approximately 8 km/s. Minimal orbital speed about the moon would be

b. less than 8 km/s

the reason the moon does not fall into earth is that

b. the moon has a sufficiently large orbital speed

The fastest moving planet in a solar system is

b. the planet nearest the sun

Escape speed from the surface of Earth is about

c. 11.2 km/s

Where does a satellite in an elliptical orbit have the greatest kinetic energy

c. 8 km/s

The reason satellites orbit Earth at least 150 km above the surface is to

c. be above Earth's atmosphere

If you could throw a baseball horizontally at a speed of 8 km/s and if there were no air drag and nothing to stop it

c. it would orbit Earth

If you were to weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight you would weigh

c. more

The speed of a satellite in an elliptical orbit is

c. not constant

There are two main processes going on in the sun that keep the sun in existence. These processes are gravitation and

c. nuclear fusion

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

c. one quarter

A projectile is fired vertically from the surface of Earth at 10 km/s. The projectile will

c. rise and then fall back to Earth's surface

The gravitational field strength at the center of Earth is

c. zero

The orbital speed for a satellite orbiting very close to Earth's surface is

d. 8000 m/s

the gravitational force between two massive spheres

d. all of the above

A period of a satellite is defined as

d. the time for a satellite to make one complete revolution around Earth

Newton hypothesized that the moon

e. all of the above

Gravitational forces are the weakest forces found in nature. Because of this

e. gravitational forces that are easily observed involve one or more large masses


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