PHYSICS CH 9

If an object is places exactly halfway between the earth and the Moon, it would fall toward the a. Earth b. Moon c. Neither of these

a. Earth

If you drop a stone into a hole drilled all the way to the other side of Earth (neglect the molten core),the stone will a. speed up until it gets to Earths core b. slow down until it reaches earth's center c. come to an abrupt stop at Earths center d. Speed up until it reaches Earth's other side

a. Speed up until it gets to Earth's center

Earths gravitational field extends a. both inside and outside Earth and throughout the entire universe b. only above and beyond Earths surface and cancels inside the earth c. Neither of these

a. both inside and outside Earth and throughout the entire universe

According to Newton, the greater the masses of interacting objects, the a. greater the gravitational force between them b. greater the force between them by the square of the masses c. less the gravitational force between them

a. greater the gravitational force between them

The direction os gravitational field is a. in the same direction as gravitational attraction b. away from the center of gravity of an object c. opposite to the direction of gravitational attraction

a. in the same direction as gravitational attraction

The mass of earth somehow increased with no change in radius, your wight would a. increase also b. decrease c. stay the same

a. increase also

Two objects moving towards each other due to gravity get closer, the acceleration of each a. increases b. decreases c. remains constant

a. increases

If the moon had twice as much mass and still orbits earth at the same distance, ocean bulges on Earth would be a. larger b. unequal in size c. not significantly different d. smaller e. none of the above

a. larger

Which rocket would require more fuel? a. one going from the earth to the moon b. one going from the moon to the earth c. both the same

a. one going from the earth to the moon

The force of Earth's gravity on a capsule in space will lessen as it moves farther away. If the capsule moves to twice its distance, the force towards earth becomes a. one-fourth b. half c. three-quarters d. none of these

a. one-fourth

Which of these three produces the greatest tidal effect on you right now? a. the Earth b. the Sun c. the Moon

a. the Earth

In comparison with other fundamental forces, the universal gravitational constant G indicates that gravity is a. very weak b. very strong c. strong

a. very weak

A weight watcher who normally weighs 400N stands on top of a very tall ladder so she is one Earth radius above Earths surface. How much weight is there? a. 400N b. 100N c. 200N d. 0 e. none of the above

b. 100N

The planet Jupiter is about 300 times as massive as Earth, yet on its surface you would weigh only about 3 times as much because a. you are 100 times more weightless there b. Jupiters radius is about 10 times earths radius c. Jupiter is significantly farther from the Sun d. your mass is 100 times less than on Jupiter e. none of the above

b. Jupiters radius is about 10 times earths radius

Pluto is classified as a a. moon b. dwarf planet c. full-fledged planet

b. dwarf planet

Newton Disovered a. gravity b. that gravity is universal c. neither of these

b. gravity

Two objects move toward each other due to gravity. As the objects get closer and closer, the force between them a. remains constant b. increases c. decreases

b. increases

The best time for digging clams (low tide) is during the time of the a. quarter moon b. new or full moon c. half moon d. none of the above

b. new or full moon

When a star collapses to form a black hole, its mass a. decreases b. remains the same c. increases

b. remains the same

The sun collapsed to a black hole, the Earth's gravitational attraction to it would be a. less b. the same c. more

b. the same

An asteroid exerts a 360-N gravitational force on a nearby spacecraft. The 360-N force on the spacecraft is directed a. away from the asteroid b. towards the asteroid c. toward the sun

b. towards the asteroid

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. summer b. winter c. spring d. none of the above

b. winter

Rate this statement: No force due to Earth's gravity acts on astronauts inside the orbiting space station. a. sometimes true b. always true while in orbit c. always false

c. always false

A very massive object A and a less massive object B move toward each other under the influence of gravity. Which force, if either, is greater? a. the force on B b. the force on A c. both forces are the same

c. both forms are the same

The identifies of dark energy and dark mater are a. unknown at this time b. subjects of intense astronomical interest c. both of these d. neither of these

c. both of these

The origin of any micro tides in the human body is most likely the a. moon b. sun c. earth

c. earth

During an eclipse of the Sun the high ocean tides on Earth are a. not significantly different b. extra low c. extra high

c. extra high

Which is most responsible for the earth's ocean tides? a. Sun b. both c. moon

c. moon

The amount of gravitational force that acts on a space vehicle whole in Earth orbit is a. the same as the vehicles weight on earth's surface b. nearly zero c. nearly as much as the vehicles weight on earths surface.

c. nearly as much as the vehicles weight on earths surface.

A hollow spherical planet is inhabited by people who live inside it, where the gravitational field is zero. When a very massive spaceship lands on the planet's surface, inhabitants find that the gravitational field inside the planet is a. still zero b. non-zero, directed away from the spaceship c. non-zero, directed toward the spaceship

c. non-zero, directed toward the spaceship

The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. For the same mass these twice-as-high apples have a. 1/4th the weight b. 1/2th the weight c. practically the same weight

c. practically the same weight

The factor most directly responsible for making a black hole invisible is its a. color b. mass c. surface escape velocity d. size e. none of the above

c. surface escape velocity

A black hole is a. an empty region of space with a huge gravitational field b. at the center of all stars c. the remains of a giant star that has undergone gravitational collapse

c. the remains of a giant star that has undergone gravitational collapse

One side of the moon is continually facing Earth is a. a passing phenomenon b. a cosmic coincidence c. tidal lock

c. tidal lock

What is the force of gravity on a 500-N woman standing on Earth's surface? a. 5000N b. 50N c. 250N d. 500N e. none of these

d. 500N

Wobbles in the path of the uranus led to the discovery a. Mars b. Neptune c. jupiter d. all of the above e. none of the above

d. Neptune

An outcome of universal gravitation is that a. its discovery prompted other laws of nature b. prediction and discovery of planets c. planets aren't cubes with sharp corners d. all of the above

d. all of the above

You can experience weight a. standing on earths surface b. in a rotating habitat in space c. in an accelerating elevators away from earth d. all of the above

d. all of the above

You experience weightlessness a. in a freely falling elevator b. momentarily when you step off a chair c. in the absence of supporting surface d.all of the above

d. all of the above