chapter 4 review

A dropped ball gains speed because

a gravitational force acts on it

A satellite near Earth makes a full circle in about 90 minutes. Much farther from Earth, say at the distance to the Moon, time for a full circle would be...

about 28 days

A bullet fired from a rifle begins to fall

as soon as it leaves the barrel

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

atmosphere

A ball rolls off the edge of a table at the same time another ball drops vertically from the same table. The ball to hit the floor first is the

both hit the same time

Acceleration is greater for a satellite in elliptical orbit when it is

closest to earth

An Earth satellite in an elliptical orbit travels slowest when it is

farthest from the earth

Compared with the period of satellites in orbit close to Earth, the period of satellites in orbit far from Earth is

greater

According to Newton, the greater the masses of interacting objects, the

greater the gravitational force between them

As a bowling ball that rolls off the edge of a table falls, its vertical component of motion

increases

When the distance between a pair of stars decreases by half, the force between them

increases to four times as much

According to Newton, the greater the distance between gravitationally interacting objects, the

less the gravitational force between them

At some point between Earth and the Moon, the forces due to gravity on a space traveler would be the same when this point is

nearer the moon

Communications and weather satellites always appear at the same place in the sky because these satellites are

orbiting the earth in a 24-hour period

The force of gravity on a satellite in circular orbit doesn't change its speed because the force is

perpendicular to its direction of motion.

A projectile is launched straight upward at 50 m/s. Neglecting air resistance its speed upon returning to its starting point is

50 m/s

A stone is thrown horizontally from the top of a cliff. One second after leaving your hand it drops a vertical distance of

5 m

Escape speed from Earth is

11.2 km/s

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

Earth

As a bowling ball that rolls off the edge of a table falls, its horizontal component of motion

remains constant

The circular path of a satellite orbiting Earth is characterized by a constant

speed, acceleration, and radial distance

Occupants of the International Space Station experience weightlessness due to

the absence of a support force

Escape speed for a rocket is less from

the moon

Your weight is defined to be the force

you exert against a supporting surface