Aball is thrown upward. after reaching a
maximum height, it continues falling back toward
earth. on the way down, the ball is
caught at the same height at which it was
thrown upward.
v0
hmax
if the time (up and down) the ball remains
in the air is 1.84 s, find its speed
when it caught. the acceleration of gravity
is 9.8 m/s
2
. neglect air resistance.
answer in units of m/s.

Athin plate moves between two parallel, horizontal, stationary flat surfaces at a constant velocity of v = 7.5 m/s. the two stationary surfaces are spaced 4 cm apart, and the medium between them is filled with oil whose viscosity is 0.9 n·s/m2. the part of the plate immersed in oil at any given time is 2 m long and 0.5 m wide. if the plate moves through the mid-plane between the surfaces, determine the force required to maintain this motion. what would your response be if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top surface (h1)? if the plate moves through the mid-plane between the surfaces, the force required to maintain the motion will be n. if the plate was 1 cm from the bottom surface (h2) and 3 cm from the top (h1) surface, the force required to maintain the motion would be n.

In a system, when potential energy decreases, then entropy also decreases. true false

Gasoline comes from petroleum, which is made from ancient living things. petroleum, therefore, contains a type of energy. a. heat b. nuclear c. biological d. chemical potential