Ablock of wood supported by two concrete blocks is chopped in half by karate instructor. identify an action-reaction pair, and compare the forces exerted by each object.

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?

Give the relation of resistance of wire with its length and thickness