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kingjames82
19.01.2021 •
Physics
A swimmer bounces straight up from a diving board and falls feet first into a pool. She starts with a velocity of 3.00 m/s, and her takeoff point is 1.40 m above the pool.
(a) How long are her feet in the air?
s
(b) What is her highest point above the board?
m
(c) What is her velocity when her feet hit the water?
m/s
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Ответ:
a) t= 0.92 s
b) h = 0.46 m
c) v = -6.04 m/s
Explanation:
A)
In order to find the total time that the feet are in the air, we must add two times:1) time needed to reach to the maximum height (t₁) 2) time from when starts to fall from the maximum height until her feet hit the water (t₂)In order to get t₁, we need to take into account that at her highest point, the vertical speed will be zero.Taking for granted the value for the acceleration due to gravity,g = -9.8 m/s2, we can apply the definition of acceleration, and replacing by the givens, we can find t₁ as follows:B)
As we have just found, the highest point above the board was at 0.46m above the takeoff point, so the highest point above the board is just 0.46 m.C)
In order to find the velocity when her feet hit the water, we can use the same equation (2), taking into account that v₀=0, and Δh = H= -1.86m.Solving (2) for vf, we get:Ответ:
Jupiter
explanation:
it's has the strongest gravitational pull on a satellite orbiting above its surface because gravity directly proportional to mass .
it's also the most massive planet.
Hope this helps :)