Question

a small air compressor delivers 1 lb per min of air while supplying 3 horsepower to the air. calculate the specific work, ft-lbf/lb, supplied to the air

Answer 1

1 horsepower (hp) = 550.00 foot pounds per second (ft-lb/sec)

3 horsepower = $3\times550=1650\ ft-lb/sec$

work =$power\times time$ =$1650\times60=99000\ ft-lbf$

specific work = $99000\ ft-lbf/1lb=99000ft-lbf/lb$