15) At the gym, a man pulls a bar on a machine that works the muscles of the upper back. It takes him 0.5 seconds to raise 30
kilograms of weights a vertical distance of 0.5 meters,
Which of these exerts the same power output? (Estimate g as 10 m/s2.)
A)
lifting 25 kilograms a distance of 2.4 meters in 2.0 seconds
B)
lifting 45 kilograms a distance of 2.4 meters in 3.0 seconds
o
leg pressing 45 kilograms a distance of 0.5 meters in 0,5 seconds
D)
bench pressing 30 kilograms a distance of 0.5 meter in 1.5 seconds

Consider a file currently consisting of 200 blocks. assume that the file control block (and the index block in the case of indexed allocation) is already in memory. calculate how many disk i/o operations are required for contiguous, linked, and indexed (single-level) allocation strategies, for each of the conditions listed below. in the contiguous-allocation case, assume that there is not room to grow at the beginning but there is room to grow at the end. also assume that the block information to be added is stored in memory.