physics multiple choice chapter 5

a ball is thrown straight upward at 10 m/s. ideally, the ball will return to the thrower's hand with a speed of

10 m/s

in the absence of air resistance, at what other angle will a thrown ball go the same distance as one thrown at an angle of 75 degrees

15 degrees

a cannonball is fired at some angle into the air. in the first second it moves 5 meters horizontally. assuming it doesn't hit the ground and air resistance is negligible, how far does it move horizontally in the next second?

5 meters

a baseball is hurled into the air at an angle of 30 degrees above the horizontal and lands on a target that is at the same level as that where the baseball started. the baseball will also land on the target if it is thrown at an angle of

60 degrees

a cannonball is launched horizontally from a tower. if the cannon has a barrel velocity of 60 m/s, where will the cannonball be second later?

60 m downrange

a cannon with a barrel velocity of 140 m/s launches a cannonball horizontally from a tower. neglecting air resistance, how far vertically will the cannonball have fallen after 4 seconds.

80 meters.

Which of the following would NOT be considered a projectile

a cannonball rolling down a slope

a ball thrown in the air will never go as far as physics ideally would predict because

air friction slows the ball

in the absence of air friction, the vertical component of a projectile's velocity doesn't change as the projectile moves

always false

in the absence of air friction, the horizontal component of a projectile's velocity doesn't change as the projectile moves.

always true

at what part of a path does a projectile have minimum speed?

at the top of its path

a ball is thrown into the air at some angle. at the very top of the ball's path, its velocity is

entirely horizontal

an object is dropped and falls freely to the ground with an acceleration of g. if it is thrown upward at an angle instead, its acceleration would be

g downward

a projectile is fired horizontally in a vacuum. the projectile maintains its horizontal component of speed because it

is not acted on by any horizontal forces

a projectile launched horizontally hits the ground in 0.8 seconds. if it had been launched with a much higher speed in the same direction, it would have hit the ground in

0.8 seconds

a cannonball is launched from the ground at an angle of 30 degrees above the horizontal and a speed of 30 m/s. ideally the ball will land on the ground with a speed of

30 m/s

In the absence of air resistance, the angle at which a thrown ball will go the farthest is

45 degrees

at the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height. which ball hits the ground first

neither--they both hit the ground at the same time

at the instant a ball is thrown horizontally with a large force, an identical ball is dropped from the same height. which ball hits the ground first?

neither. they both hit the ground at the same time.

after a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is

the same as when it was at the top of its path.

the horizontal component of a projectile's velocity is independent of

the vertical component of its velocity