Chapter 13-14 ~ M.C.

Pataasin ang iyong marka sa homework at exams ngayon gamit ang Quizwiz!

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


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