PHYS 1210 ch 9 & 10

Which is most responsible for the ocean tides?

the moon

When the distance between two stars decreases by half, the force between them

increases to four times as much.

A "weightless" astronaut in an orbiting shuttle is

like the shuttle, pulled by Earth's gravitation.

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

mass of the building attracts us upward slightly

The reason the moon does not crash into the Earth is that the

moon has a sufficient tangential speed.

What prevents satellites such as the space shuttle from falling?

nothing, they are continually falling as they orbit the Earth.

The force of gravity acts on all apples on an apple tree. Some apples are twice as far from the ground as others. These twice-as-high apples, for the same mass, have

practically the same weight

Roll a bowling ball off the edge of a table. As it falls, its horizontal component of velocity

remains constant

After a rock thrown straight up reaches the top of its path and then falls a short distance, its acceleration is (neglect air resistance)

the same as it was at the top of its path

A stone is thrown horizontally from the top of a cliff. One second after it has left your hand, its vertical distance below the top of the cliff is

5 m

What is the force of gravity on a 500-newton woman standing on the Earth's surface?

500 N

A gun with a muzzle velocity of 100 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later?

100

A weight watcher who normally weighs 400 N stands on top of a very tall ladder so she is one Earth radius above the Earth's surface. How much would she weigh there?

100 N

A bullet fired horizontally from a rifle begins to fall

as soon as it leaves the barrel

An object is placed exactly halfway between the Earth and moon. The object will fall toward the

Earth

The amount of gravitational force that acts on the space shuttle while in orbit is

almost as much as the shuttle's weight on the Earth's surface

No force due to Earth's gravity is acting on the astronauts inside the orbiting space shuttle. This statement is

always false

Earth satellites are typically more than 100 km high so as to be above the Earth's

atmosphere

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

both forces are the same