Question

1. From the top of a cliff overlooking a lake, a person throws two stones. The stones have identical initial speeds, but stone 1 is thrown downward at an angle below the horizontal, while stone 2 is thrown upward at the same angle above the horizontal. Neglect air resistance and decide which stone, if either, strikes the water with greater velocity (Answer conceptually)

2. A steel ball is dropped onto a very hard floor. Over and over again, the ball rebounds to its original height (assuming no energy is lost during the collision with the floor). Is the motion of the ball simple harmonic motion?(Answer conceptually)

3. In an amusement park ride , powerful magnets accelerate a car and its riders from rest to 45 m/s in a time of 7.0 sec. The combined mass of the car and riders is 5.5 x 103 kg. Find the average net force exerted on the car and the riders by the magnets. (Include equations , plug in numbers with their units and then arrive at the final answer)

Answer #1

A person throws two identical stones from the top of a 200-m
high cliff overlooking a lake. Stone 1 is thrown at an angle of
30o above the horizontal with an initial speed of 40
m/s. Stone 2 is thrown at an angle of 30o below the
horizontal with an initial speed of 40 m/s. Neglect air
resistance.
Which stone hits the water first?
Stone 1.
They hit at the same time.
Stone 2.
Which stone strikes the water with...

A physics student stands on a cliff overlooking a lake and
decides to throw a tennis ball to her friends in the water below.
She throws the tennis ball with a velocity of 22.5 m/s22.5 m/s at
an angle of 40.5∘40.5∘ above the horizontal. When the tennis ball
leaves her hand, it is 11.5 m11.5 m above the water. How far does
the tennis ball travel horizontally before it hits the water?
Neglect any effects of air resistance when calculating...

21) A person carries a 25.0-N rock through the path shown in the
figure, starting at point A and ending at point B. The total time
from A to B is 1.50 min. How much work did gravity do on the rock
between A and B?
A) 625 J
B) 20.0 J
C) 275 J
D) 75 J
E) 0 J
22) A person carries a 2.00-N pebble through the path shown in
the figure, starting at point A and...

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