Alex throws a ball horizontally from the top of a building that is 45.0 m high. He hopes the ball will reach a swimming pool that is at the bottom of the building, 15.0 m horizontally from the edge the building. If the ball is to reach the pool, with what initial speed must throw it with?
Question 23
23.
A ball is thrown horizontally from the top of a tall cliff. Neglecting air drag, what vertical distance has the ball fallen 5.00 seconds later?
Question 24
24.
The Essex county sheriff is trying to determine the speed of a car that slid off a small bridge on a snowy New England night and landed in a snow pile 5.92 m below the level of the road. The tire tracks in the snow show that the car landed 10.17 m measured horizontally from the bridge. How fast was the car going when it left the road?
Question 25
25.
A long jumper leaves the ground with an initial velocity of 12.888 m/s at an angle of 27.33-degrees above the horizontal. Determine the time of flight
Question 26
26.
A long jumper leaves the ground with an initial velocity of 12.888 m/s at an angle of 27.33-degrees above the horizontal.
the horizontal distance
Question 27
27.
A long jumper leaves the ground with an initial velocity of 12.888 m/s at an angle of 27.33-degrees above the horizontal.
Find the peak height of the long-jumper.
Question 28
28.
While skiing, Ellen encounters an unexpected icy bump, which she leaves horizontally at 12.37 m/s. How far out, horizontally, from her starting point will Ellen land if she drops a distance of 8.14 m in the fall?
Question 29
29.
A pool ball leaves a 0.61-meter high table with an initial horizontal velocity of 2.6 m/s. Predict the time required for the pool ball to fall to the ground.
Question 30
30.
A pool ball leaves a 0.61-meter high table with an initial horizontal velocity of 2.6 m/s. Predict the horizontal distance between the table's edge and the ball's landing location.
Question 31
31.
A ship fires its guns with a speed of 426.5 m/s at an angle of 40.35º with the horizontal. Find the range.
Question 32
32.
A ship fires its guns with a speed of 426.5 m/s at an angle of 40.35º with the horizontal. Find the maximum altitude.
Question 33
33.
A person kicks a rock off a cliff horizontally with a speed of 26.5 m/s. It takes 8.79 seconds to hit the ground, find:
a. height of the cliff
Question 34
34.
A person kicks a rock off a cliff horizontally with a speed of 26.5 m/s. It takes 8.79 seconds to hit the ground, find:
b. final vertical velocity
Question 35
35.
A person kicks a rock off a cliff horizontally with a speed of 26.5 m/s. It takes 8.79 seconds to hit the ground, find:
c. range
Question 36
36.
Essay--Answer the essay question in the space provided. Use the following FCA’s:
1. Answer should contain at least two complete sentences and a picture.
2. Use science terminology in chapter 5.
3. Site specific examples from your notes, real-world, or book in your explanation.
Figure below shows two balls released simultaneously from a mechanism that allows one ball to drop freely while the other is projected horizontally. Explain why the balls fall farther and farther each successive time interval. Explain why the projected ball has the same vertical location as the falling ball.
A vector is a quantity that has
time and direction.
magnitude and time.
magnitude and direction.
Which of the following would NOT be considered a projectile?
All of the choices are projectiles.
A cannonball thrown through the air
A cannonball rolling down a slope
A cannonball rolling off the edge of a table
A cannonball thrown straight up
The horizontal component of a projectile's velocity is independent of
the vertical component of its velocity.
time.
the range of the projectile.
In the absence of air friction, the vertical component of a projectile's velocity doesn't change as the projectile moves.
sometimes true
always false
always true
not enough information
In the absence of air friction, the horizontal component of a projectile's velocity doesn't change as the projectile moves.
sometimes true
always false
not enough information
always true
A ball thrown in the air will never go as far as physics ideally would predict because
ideally the ball would never land.
gravity is acting upward.
one can never throw the ball fast enough.
all of the choices.
air friction slows the ball.
A ball is thrown into the air at some angle. At the very top of the ball's path, its velocity is
entirely vertical.
entirely horizontal.
both vertical and horizontal.
There's not enough information given to determine.
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?
The dropped ball.
Neither. They both hit the ground at the same time.
The horizontally thrown ball.
In the absence of air resistance, the angle at which a thrown ball will go the farthest is
60 degrees
45 degrees
75 degrees
15 degrees
90 degrees
30 degrees
At what part of a path does a projectile have minimum speed?
When it returns to the ground
Halfway to the top
At the top of its path
When it is thrown
There's not enough information to say.
A cannonball is launched from the ground at an angle of 40 degrees above the horizontal and a speed of 40 m/s. Ideally (no air resistance) the ball will land on the ground with a speed of
40 m/s
50 m/s
30 m/s
-0m/s
0 m/s
A projectile launched horizontally hits the ground in 1.1 seconds. If it had been launched with a much higher speed in the same direction, it would have hit the ground (neglecting Earth's curvature and air resistance) in
1.1 seconds
less than 1.1 seconds
more than 1.1 seconds
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.
has no vertical component of speed to begin with.
is not acted on by any forces.
the net force acting on it is zero.
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
larger than g.
g upward.
0.
none of the choices
g downward.
After a rock that is thrown straight up reaches the top of its path and is starting to fall back down, its acceleration is (neglecting air resistance)
the same as when it was at the top of its path.
less than when it was at the top of its path.
greater than when it was at the top of its path.
A soccerball at some angle into the air. In the first second it moves 20 meters horizontally. Assuming it doesn't hit the ground and air resistance is negligible, how far does it move horizontally in the next second?
not enough information
less than 20 m
20 m
more than 20 m
An airplane flying into a head wind loses ground speed, and an airplane flying with the wind gains ground speed. If an airplane flies at right angles to the wind, then ground speed is
more
less
unchanged
A ball is hurled into the air at an angle of 20 degrees above the horizontal and lands on a target that is at the same level as that where the started. The will also land on the target if it is thrown at an angle of
10 degrees
60 degrees
none of the choices
70 degrees
30 degrees
A cannonball is launched horizontally from a tower. If the cannon has a barrel velocity of 80.0 m/s, where will the cannonball be 1 second later? (Neglect air resistance.)
80 m downrange
400 m downrange
40 m downrange
8 m downrange
none of these choices
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 40 degrees?
60 degrees
10 degrees
50 degrees
90 degrees
40 degrees
20 degrees
80 degrees
30 degrees
70 degrees
A cannon with a barrel velocity of 110 m/s launches a cannonball horizontally from a tower. Neglecting air resistance, how far vertically will the cannonball have fallen after 2 seconds ?