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?