Exam 9: Gravity

If the moon were four times as massive but twice as far from Earth,high tides on Earth would be

A hollow spherical planet is inhabited by people who live inside it,where the gravitational field is zero.When a very massive space ship lands on the planet's surface,inhabitants find that the gravitational field inside the planet is

Inside a freely falling runaway elevator,your

Each of us weighs a tiny bit less inside the ground floor of a skyscraper than we do on the ground away from the skyscraper.The reason for this is the

When a star collapses to form a black hole,its mass

Suppose the moon had twice as much mass as it now does and still orbited the Earth at the same distance.In that case,the ocean bulges on Earth would be

Passengers in a high-flying jumbo jet feel their normal weight in flight,while passengers in the orbiting space shuttle do not.This is because passengers in the space shuttle are

Newton discovered

Which of these three produces the greatest tidal effect on you right now?

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

If the sun somehow became twice as massive,your weight as normally measured here on Earth would

Which is most responsible for the ocean tides?

When you step on a weighing scale at noon,the Earth pulls you down and the overhead sun pulls you upward.The reason the sun's pull doesn't decrease your weight at noon is because

Half way to the center of a completely hollow planet with a thin uniform shell,your weight would be

The Earth's gravitational field extends

The force of gravity acting on you will increase if you

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

A black hole is

Consider two planets in space that gravitationally attract each other.If the masses of both planets are doubled,and the distance between them is also doubled,then the force between them is

During an eclipse of the sun the high ocean tides on Earth are