Physics Ch. 9-10

A hunter on level ground fires a bullet at an angle of 2 degrees below the horizontal while simultaneously dropping another bullet from the level of the rifle. Which bullet will hit the ground first?

the fired one

speed that a projectile, space probe, or similar object must reach to escape the gravitational influence of the earth or another celestial body to which it is attracted

escape speed

A projectile is fired vertically from the earth's surface at kps. The projectile will...

go into circular orbit about the earth

influence that a massive body extends into the space around itself, producing a force on another massive body

gravitational field

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

greater the gravitational force between them

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

increase also

Two objects move toward each other because of gravity. As the objects get closer and closer, the acceleration of each....

increases

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

increases

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

it is not acted on by any horizontal forces

tides that occur when the moon is midway between new and full, in either direction

neap tides

What prevents satellites such as a space shuttle from falling?

nothing, they are falling continuously all around the earth

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

orbiting the earth with a 24hr period

curved path followed by a projectile under influence of gravity only

parabola

an object that moves through air or space under the influence of gravity

projectile

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

remain unchanged

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

remains constant

A rock is thrown upward at 45 degrees. As it rises, its horizontal component of velocity...

remains unchanged

projectile or small celestial body that orbits a larger celestial body

satellite

A black hole is...

simply the remains of a giant star that has undergone gravitational collapse

A satellite in a circular orbit travels at a constant...

speed

high or low tides that occur when the sun, earth, and moon are all lined up

spring tides

The planet Jupiter is about 300 times as massive as Earth, yet on its surface you would weigh only about 3 times as much. This is because....

the radius of Jupiter is 10 times the Earth's radius

The speeds of the planets about the sun depend on...

their distances from the sun

Tidal forces in general are the results of..

unequal forces acting on different parts of the body

the force that an object exerts on a supporting surface, which is often, but not always, due to the force of gravity

weight

being without a support force, as in free fall

weightless

How far must one travel to get away from the Earth's gravitational field?

you can't travel far enough

An asteroid exerts a 360 N gravitational force on a nearby spacecraft. If the spacecraft moves to a point 3 times as far from the center of the asteroid, the force will be...

40 N

A projectile is fired into the air at an angle of 50 degrees with the ground and lands on a target that is at the same level at which the projectile started. It will also land on the target if it is fired at an angle of...

40 degrees

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

5m

A gun with a muzzle velocity of 150 m/s is fired horizontally from a tower. Neglecting air resistance, how far downrange will the bullet be 1 second later?

150 m

Two projectiles are fired from the ground level at equal speeds but different angles. One is fired at an angle of 30 degrees and the other at 60 degrees. The projectile to hit the ground first will be the one fired at (neglect air resistance)

30 degrees

A law relating the intensity of an effect to the inverse square of the distance from the cause

Inverse-square law

There are no tides seen in the community swimming pool because...

all parts of it are practically the same distance from the moon

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

concentration of mass resulting from gravitational collapse, near which gravity is so intense that not even light can escape

black hole

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

The earth's gravitational field extends...

both inside and outside the Earth and throughout the entire universe

A rock is thrown upward at 45 degrees. As it rises, its vertical component of velocity...

decreases

The origin of any micro tides in the human body is most likely the...

earth

A projectile is fired vertically and is somehow able to maintain a continuous upward velocity of 8 kps will...

escape from the earth