Chapter 9 Conceptual Physics

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which is most responsible for earths ocean tides?

moon

If the sun became twice as massive, your attraction to the sun would double and your weight as measured on earth would

not change

newton discovered

that gravity is universal

imagine you are standing atop a ladder so tall that you are 4 earth radii from earths center. wheat is your weight at the top of the ladder, relative to your weight on the ground

1/16 as much

a weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above earth's surface. how much is her weight there

100 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

what is the force of gravity on a 500 N woman standing on earth's surface

500 N

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

both forces are the same

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

remains the same

to make a profit, a buyer purchases metal by weight at one altitude and sells it at the same price per pound at another altitude. the supplier would

buy at high altitude and sell at a low altitude

if earth's radius somehow increased with no change in mass, your weight would

decrease

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

decrease to half

on each given day and location. tides rise and fall at

different times

which is greater, the gravitational force between earth and the moon, or the force between earth and the sun?

earth -- sun

During an eclipse of the sun (when the moon and the sun are totally lined up) the high ocean tides on earth are

extra high

newton has the insight to see that the

force on the moon has the same nature as the force on an apple

according to newton, the greater the mass of interacting objects, the

greater the gravitational force between them

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

increase also

as two objects moving toward each other due to gravity get closer, the acceleration of each

increases

If the moon had twice as much mass and still orbits Earth at the same distance, ocean bulges on earth would be

larger

When you weigh yourself on a bathroom scale on a slight incline instead of a level surface, your weight reading on the scale will be

less

The force of gravity acting on you will increase if you

stand on a planet with a radius that is shrinking

the force of gravity acting on you will increase if you

stand on a planet with a shrinking radius

which pulls on the oceans of earth with a greater force

sun

if the sun were twice as massive

the pull of the earth on the sun would double the pull on earth would double *both of these*

a black hole is

the remains of a giant star that has undergone gravitational collapse

if the sun collapsed to a black hole, earth's gravitational attraction to it would be

the same

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

tidal forces in general are the result of

unequal forces acting on different parts of a body

in comparison with other fundamental forces, the universal gravitational constant G indicates that gravity is

very weak

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

winter

your weight is the force

you exert against a supporting surface

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

zero

the best time for digging clams (when the tide is extra low) is during the time of the

new or full moon

the force of gravity on you is greatest when you are standing

on earth's surface

the main reason ocean tides exist is that the moons pull is stronger

on water closer to it than on water farther away

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 toward earth becomes

one fourth

according to newton, when the distance between two interacting objects doubles, the gravitational force is

one quarter

half-way to the center of a planet of uniform density, your weight compared to that at the surface would be

one-half

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

practically the same weight

if a block is set sliding on a huge imaginary frictionless plane in contact with Earths surface, it will NOT sustain a constant speed because

a component of gravitational force

we do not observe tides in a community swimming pool because

all parts of it are practically the same distance from the moon

the force of Earth's gravity on a capsule in space increases as ti comes closer. when the capsule moves to half its distance, the force toward earth is then

four times greater

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

more

what would a person who weights 630 N on earth weight on a planet that has the same mass as earth but half its radius

2520 N

Two planets in space gravitationally attract each other. If both the masses and distances are doubled, the force between them is

does not change

You experience weightlessness

in the absence of a supporting surface in a freely falling elevator momentarily when you step off a chair *all of the answers are correct*

two objects move toward each other due to gravity. as the objects get closer and closer, the force between them

increases

When the distance between two stars decreases by one third, the force between them

increases to nine times as much


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