Two bodies A and B are attached to the end of a string which passes over a pulley, so that they hang vertically. If the mass of the body B is 4 kg;
find mass of the body A which moves up with an acceleration of 0.5 ms
(Take g = 10 ms-2)
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Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

During the past 150 years in the united states, how did energy consumption compare to population growth