Chapter 13-14 ~ M.C.
Escape speed from the surface of Earth is about
11.2 km/s
Suppose the gravitational force between two spheres is 70 N if the distance between the spheres is halved what is the force between the masses
140 N
Suppose the gravitational force between two masses is 70 N. If the magnitude of one of the masses halves, what is the force between the masses
35 N
The curvature of the earth is such that for every 8000 m tangent to the surface, the surface drops about
5 m
Where does a satellite in a circular orbit have the greatest kinetic energy
Anywhere - it's kinetic energy is constant
Where does a satellite in an elliptical orbit have the greatest kinetic energy
At the point closer to the planet
Since Earth is attracted to the sun, why doesn't it fall into the sun
Because it has to much mass to move toward the sun
Why did Newton think there was a force acting on the moon
Because the moon moves in a curved path
A very massive object A and a less massive object B move toward each other under the influence of mutual gravitation. Which force, if either, is greater
Both forces are the same
A supplier wants to make a profit by buying metal by weight at one altitude and selling it at the same price per pound another out too. The supplier should
Buy at a high altitude and sell at a low altitude
As a satellite is moving in orbit around the earth, the sum of the kinetic energy and potential energy everywhere is
Constant
The speed of a satellite in a circular orbit is
Constant
A planet has half the mass of the earth and half the radius. Compared to its way on earth, an apple on this planet would weigh
Half as much
Pluto takes a longer time to travel around the earth then earth takes because Pluto
Has farther to go and goes slower
If the mass of Earth increased, with no change in radius, your weight would
Increase also
Newton hypothesized that the moon
Is falling around earth
What remains constant for a satellite in an elliptical orbit
It's distance from the planet
The early bird communications satellite hovers over the same point on Earth's equator indefinitely. This is because
It's orbital period is 24 hours
Jupiter has more than 300 times the mass of arts. Yet on Jupiter's surface and object weigh only about three times as much is it what on earth. The explanation to this involves Jupiter's
Large radius
If you were to weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight you would weigh
More
The speed of a satellite in an elliptical orbit is
Not constant
There are two main processes going on in the sun that keep the sun in existence. These processes are gravitation and
Nuclear fission
Newton reason that the gravitational attraction between Earth and the Moon must be
Reduced by distance
When a star collapses to form a blackhole, it's mass
Remains the same
A projectile is fired vertically from the surface of Earth at 10 km/s the projectile will
Rise and then fall back to Earth's surface
This circular orbit of a satellite orbiting earth is characterized by a constant
Speed
The force of gravity acting on you will increase if you
Stand on the planet with a radius that is shrinking
The fastest moving planet in the solar system is
The planet nearest the sun
A period of a satellite is defined as
The time for a satellite to make one complete revolution around the earth
If you were to weigh yourself an elevator that is in freefall, compared to ordinary weight, you would weigh
Zero
The gravitational field strength at the center of the earth is
Zero
