Problem 1

Where do you weigh more--at the bottom of Death Valley or atop one of the peaks of the sierra Nevada? Detend your answer.

You weigh more on the summit, because the higher you go, the harder you al

You weigh more in Death valley because more atmosphere pushes down on you

You weigh more in Death Valley because you are closer to the center of Eart

You weigh more on the summit because the air buoys you up less

Problem 2

How could your weight be greater than ma? How could your weight be zero? Give example.

Your weight is greater than mg when you are accelerating upward. Your weight is zero when you are in free fall

Your weight is greater than mg when you are accelerating downward. Your weight is zero when you are in free fall.

Your weight is greater than mg when you are on top of a mountain. Your weight Is zero when you are in free fal

Your weight is greater than mg when you are in free fall

Your weight is zero when you are accelerating upward

Problem 3

Which has the higher tides: spring tides or neap tides? Why?

Spring tides are higher, because the tides from the Moon and Sun partially cancel

Spring tides are higher, because the tides from the Moon and Sun add together.

Neap tides are higher, because the tides from the Moon and Sun add together.

Neap tides are higher, because the tides from the Moon and Sun partially cancel.

Problem 4

Why are all tides greatest at the time of a full Moon or new Moon?

At full Moon and new Moon, the tides from the Moon and the Sun add because they are in line with Earth.

At full Moon and new Moon, the tides from the Moon and the Sun partially cancel because they are in line with Earth.

At full Moon and new Moon, the tides from the Moon and the Sun partially cancel because they make a right angle with Earth.

At full Moon and new Moon, the tides from the Moon and the Sun add because they make a right angle with Earth.

Problem 5

What is a gravitational field and how can its strength be measured

It is a force field on a body with mass, with direction and magnitude equal to the inverse square of to test mass

It is a force field on any body with mass. Its strength is the force per unit mass on a test mas

It is a force field in empty space with direction and magnitude equal to the inverse square of the mass of a test mass

Its force field with direction and magnitude at every point in space. Its strength is the force on a test mass

Problem 6

What is the magnitude of the gravitational field at Earth's center?

2g N/kg

Zero N/kg

g/2 N/kg

g N/kg

Problem 7

Why is a black hole invisible?

A black hole is made of matter that absorbs all wavelengths of light.

A black hole is surrounded by an opaque cloud of dust.

The escape velocity of the black hole is greater than the speed of light

A black hole is a black dwarf star

Problem 8

Calculate the force of Earth's gravity on a 1.0-kg mass at Earth's surface. The mass of Earth is 6.0 x1024 kg and its radius is 6.4 x106 m. Does the result surprise you?

Express your answer with the appropriate units.

Problem 9

Calculate the force of gravity on a 1kg mass if it were 3.2 106 m above Earth's surface (that is it were one and a half Earth radii from Earth's center).

Express your answer to two significant figures and include the appropriate units

Problem 10

If the Moon pulls Earth as strongly as Earth pulls the Moon, why doesn't Earth rotate around the Moon, or why don't both rotate around a point midway between them?

Problem 11

What would be the path of the Moon if somehow all gravitational forces on it vanished to zero?

Problem 12

Is the acceleration due to gravity more or less atop Mt. Everest than at sea level? Defend your

Problem 13

Calculate the force of gravity a newborn baby (mass 2.7 kg) and the planet Mars (mass 6.41023kg) exert on each other when Mars is at its closest to Earth (distance 5.61010 m).

Problem 14

Find the change in the force of gravity between two planets when the distance between them is decreased by 16

Problem 15

Is there change in the force of gravity between two objects when their masses are doubled and the distance between them is also doubled?

yes

no

Problem 16

Find the change in the gravitational force between two planets if the masses of both planets

are doubled but the distance between them stays the same