Physics

Gravitational force between two spheres is 30N. If the magnitude of each doubles, what is the force between the two

120N

A 560N woman stands on top of a very tall ladder so she is one earth radius above earths surface. How much does she weigh

140N

If the earth had twice it's present mass, but the same radius, what would be the value of g

19.6 m/s^2

How many tides are there normally each day on a typical ocean beach

2

Suppose the gravitational force between two massive spheres is 100N. If the distance between the sphere is doubled, what is the force between masses

25 N

Gravitational force between two spheres is 70N. If distance between spheres is halved, what is the force between masses

280N

Gravitational force is 70 between two masses. If one magnitude halves, what is the force between the two

35N

Since earth is attracted to the sun, why doesn't it fall into the sun

Because it has sufficient tangential velocity

What is the object that has an enourmous density and gravitational feild near it, alters the space around it, and has an escape speed greater than the speed of light

Black hole

A very massive object A and a less massive object B move toward each other under the influence of mutual gravitation. Which force is greater

Both forces are the same

If earths mass decreased to one half it's original mass with no change in radius, then your weight would

Decrease to one half your original weight

The value of the acceleration due to gravity

Depends on the gravitational constant, the mass and radius of earth, and is different on other planets

Earth tides in which the solid surface of earth rises and falls are caused by

Different forces between the moon and opposite parts of earth

A rock and pebble will fall with the same acceleration in a gravitational field because the gravitational force on each is

Different, but the ratio is the same

A lunar eclipse happens when

Earth is bee between the moon and sun

During an eclipse of the sun, when the moon comes between the sun and earth, the ocean tide nearest the moon would be

Extra high

Jupiter has more than 300 times the mass of earth. On jupiters surface an object weighs only 3 times as much. This explanation involves jupiters

High density

If the radius of earth decreased with no change in mass, your weight would

Increase

If the mass of earth increased, with no change in radius, your weight would

Increase also

Newton hypothesized that the moon

Is a projectile, is falling around earth, is actually attracted to earth

If you were to weigh yourself in an elevator that is accelerating upward, compared to your ordinary weight you would weigh

More

When a very massive space ship lands on a hollow planets surface, the gravitational field inside the planet is

Nonzero, directed toward the spaceship

There are two main processes going on in the sun that keep the sun in existence they are gravitation and

Nuclear fusion

Ocean tides occur mainly because

Of different gravitational pulls of the moon on opposite sides of earth

If you stood atop a ladder on earth that was as tall as earths radius(so you were twice as far from the earths center) your weight on the ladder would be

One quarter the normal value

If the sun were to collapse to form a black hole, earth would

Orbit the black hole just as it orbits the sun now

When a star collapses to form a black hole, it's mass

Remains the same

The force of gravity acting on you will increase if you

Stand on a planet with a radius that is shrinking

Newton had the insight that

The earth is moving

A solar eclipse happens when

The moon is between the earth and sun

A planet has half the mass of the Earth and half the radius. Compared to its weight on earth, and Apple on this planet would weigh

Twice as much

By noticing that Uranus orbit is perturbed and by using the law of gravitation, two astronomers independently discovered

Uranus has several moons

The gravitational field strength at the center of earth is

Zero