Answer:
Trish
Explanation:
the work done by each girl in throwing the ball is equal to the kinetic energy acquired by the ball. The ball thrown by Jamie has for sure more kinetic energy than the ball thrown by Trish, since it travels for a longer distance (25 m against 15 m), therefore this means that Jamie did more work than Trish in throwing the ball.
Answer:
13.5 ms
Explanation:
The sound wave travels with uniform motion in both cases, so the time taken to cover a distance d is given by:
where
d is the distance to cover
v = 340 m/s is the speed of sound in air
So for the people across the newsroom,
d = 4.7 m
So the time taken is
The radio waves instead travels with uniform motion at the speed of light:
So the time taken for them is
where
d = 82 km = 82,000 m
is the distance of the people who are 82 km away. Substituting,
Therefore, the difference in time is
You would tell them that sand comes from weathered rocks that have been eroded by water over time. Since there must be rocks by the river and the water is always moving along it, the rocks must have gotten weathered and turned into sand. That's where the sand comes from.
Answer:
1.2 m/s^2
Explanation:
acceleration = change in velocity / change in time
= 6 m/s / 5 sec = 1.2 m/s^2
Longshore current brings about the transportation of sediments on the beach. Since waves usually approach the shore are an angle, the beach sand are carried up or down depending on the direction of the waves resulting in beach drift, that is, the net movement of the beach sand.