3. Suppose a brick is suspended from a rigid support by a suitable length of cord. a.) What downward force acts on the brick? b.) If this force is the action force, what is the corresponding reaction force? 4. a.) What upward force acts on the suspended brick in Question 3? b.) If this force is the action force, what is the corresponding reaction force?

The rocks expand when there hot/warm  and contract when they are cold.

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j

Ifound this answer online hope it

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