Physics Chapter 9

676 N

Saturn has a mass of 5.7 x 10^26 kg and a radius of 6.0 x 10^7 m. If it would be possible to do this, find the weight, (force of gravity), of a 65 kg person standing on the surface of Saturn.

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

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

Jupiter's radius is 10 time the Earth's radius

The planet Jupiter is about 300 times as massive as Earth, yet on its surface you would weigh only about 3 times as much. This is because

Moon has a sufficient tangential speed

The reason the moon does not crash into the Earth is that the

π

The universal gravitational constant, G, which links force to mass and distance, is similar to the familiar constant

Increases

Two objects move toward each other because of gravity. As the objects get closer and closer, the acceleration of each

Both the pull of the Earth on the sun would double. Its pull on Earth would double

If the sun were twice as massive

Accelerates upward

If you weigh yourself in an elevator, you'll weight more when the elevator

Apparent weight for you

Inside a freely falling elevator, there would be no

The same

If the sun collapsed to a black hole, the Earth's gravitational attraction to it would be

Divides by 4 the gravitational force between them

According to Newton, doubling the distance between two interacting objects

40 N

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

One-half

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

A worm hole are two black holes put together

How are black holes and worm holes related?

Stars are always in a battle with gravity

How does the phrase that "gravity always wins" relate to stars?

Forget it; you can't travel far enough

How far must one travel to get away from the Earth's gravitational field?

Doubles

If the mass of one planet is somehow doubled, the force of gravity between it and a neighboring planet

Quadruples

If the masses of two planets are each somehow doubled, the force of gravity between them

That gravity is universal

Newton discovered

Earthly and heavenly laws

Newton's most celebrated synthesis was and is of

Both inside and outside the Earth and throughout the entire universe

The Earth's gravitational field extends

Surface escape velocity

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

Masses and distance apart

The force of gravity between two planets depends on their

"G" is the gravitational constant. "g" is 10m/s^2. It is Earth's gravity

We have been using both "G" and "g" as it relates to this chapter. What do each of these have to do with gravity?

Distance and mass

What are two factors that affect gravity?

How big it is. Eventually, our sun will burn out and become a white dwarf

What factor has the greatest influence on the life and death of a star? What will be the fate of our sun?

Weight is the force of gravity. Weightlessness is the force of gravity that is not experienced. Ex. Free falling elevator

What is the difference between weight and weightlessness? Give a situation/scenario for each.

500 N

What is the force of gravity on a 500-newton woman standing on the Earth's surface?

Used around the universe. As Newton sat under a tree, an apple fell on his head

What is the significance of the word universal in Newton's law of universal gravitation? What is the supposed story/myth behind Newton's famous law?

Gravity is a distortion of space-time

What was Einstein's explanation for gravity?

It would not break away from the attraction of the Sun. It would not be pulled into the Sun. It would not become a black hole too.

What would happen to Earth if the Sun became a black hole

Less

When an elevator accelerates downward, your weight reading is

Greater

When an elevator accelerates upward, your weight reading on a scale is

Zero

When the elevator cable breaks, the elevator falls freely, so your weight reading is

Spring tides are extremely high and low tides

Why should leaders of coastal communities be concerned about ocean tides particularly spring tides?