Chapter 4

A woman who normally weighs 400N 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?

100N

Consider a monkey wrench released at rest at the far edge of the solar system. Suppose that it drops to Earth by virtue of only Earth's gravity. It will strike Earth's surface with a speed of about

11km/s

The hang time of an athlete who moves horizontally 2m during a 1.25m high jump is

1s

A rock is thrown upward at 50° with respect to the horizontal. As it rises, its vertical component of velocity

decreases

The fastest moving planet in a solar system is

the planet nearest the Sun

If your mass, the mass of the Earth, and the mass of everything in the solar system were twice as much as it is now, yet everything stayed the same size, your weight on Earth would be

quadruple

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

5m

For the astronauts inside the orbiting space shuttle, there is no force of Earth's gravity acting on them. This statement is

always false

Inside a freely falling elevator, there would be no

apparent weight for you

A bullet fired from a rifle begins to fall

as soon as it leaves the barrel

A lunar month is about 28 days. If the Moon were closer to Earth than it is now, the lunar month would be

less than 28 days

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

less the gravitational force between them

Tangential velocity is velocity

parallel to the surface of the Earth

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

500N

A projectile is launched vertically at 50m/s. If air resistance is negligible, its speed upon returning to its starting point is

50m/s

The period of a satellite, the time it takes for a complete revolution, depends on the satellite's

radial distance

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

without support forces

A ball player wishes to determine pitching speed by throwing a ball horizontally from an elecation of 5m above the ground. The player sees the ball land 20m down range. What is the player's pitching speed?

20m/s

If a projectile is fired straight up at a speed of 10m/s, the total time to return to its starting position is about

2s

Two projectiles are fired at equal speeds but different angles. One is fired at an angle of 30° and the other at 60°. The projectile to hit the ground first will be the one fired at

30°

A projectile is thrown into the air at an angle of 50° and lands on a target that is at the same level the projectile started. It will also land on the target if it is thrown at an angle of

40°

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

Earth

A bullet fired horizontally hits the ground in 0.5s. ILf it had been fired with twice the speed in the same direction, it would have hit the ground in

0.5s

The space shuttle orbits at altitudes greater than 150km so as to be above Earth's

atmosphere

The force of gravity does work on a satellite whit it is in

elliptical orbit

When the distance between two stars is decreased by half, the force between them

increases to four times as much