Gravity

Throw an object at an angle upward. With no gravity it will follow a straight-line path. But because of gravity, at the end of 1 s, it is

5 m below the straight line

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 m downrange

A "weightless" astronaut in on orbiting shuttle is

Like the shuttle, pulled by earth's gravitation

Acceleration is greatest for a satellite when it is at the

Perigee

A ball is thrown upwards and caught when it comes back down. Neglecting air resistance, the speed with which it is caught is

The same as the speed it had when thrown upward

A satellite near Earth makes a full circle in about 90 minutes. How long would a satellite located as far away as the Moon take to orbit Earth?

about 28 days

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

earth

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

elliptical orbit

A hunter aims a rifle at an angle of 10° above the horizontal. The hunter fires a bullet while simultaneously dropping another bullet from the side of the rifle. Which bullet hits the ground first?

the dropped one

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

increases to four times as much

Two objects move toward each other because of gravitational attraction. As the objects get closer and closer, the acceleration between them

Increases

Minimal orbit speed about Earth is about 8 km/s. Minimal orbital speed about Mercury would be

Less than 8km per second

Tangential velocity is velocity

parallel to the surface of the Earth

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

20 m

A projectile is fired horizontally in a region of no air resistance. The projectile maintains its horizontal component of speed because it

is not acted on by any horizontal forces

Minimal orbital speed about the Earth is about 8 km/s. Minimal orbital speed about the moon would be

less than 8 km/s

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

less the gravitational force between them

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

longer

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 because the

mass of the building attracts us upward slightly

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

remains unchanged

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

same

Ignoring air drag, what is the maximum speed that can be given to a horizontally moving tennis ball as it clears the net 1.25 m high to remain within the edge of the court, which is 12.0 m distant?

24.0 m/s

An Earth satellite is in an elliptical orbit. The satellite travels fastest when it is

At the perigee

Communication and weather satellites always appear at the same place in the sky. This is because these satellites are

Geosynchronous

According to newton, the greater the masses of interaction objects, the

Greater the gravitational force between them

It takes Pluto a longer time to orbit the sun than the Earth does because Pluto

Has further to go and goes slower

Two objects move toward each other due to gravity. As the objects get closer and closer, the force between them

increases