Respuesta :
Answer: Power developed by her is 0.32 hp
Explanation:
Work done , W= Force(F) X Displacement (d) in the direction of force
Thus work done , [tex]W=Fd=110\times 4.0 ft-lbf = 440 ft-lbf[/tex]
Now 1.0 ft-lbf = 1.355 joules of energy
Therefore , work done, W= 440x 1.355 J = 596.2 J
Average Power , [tex]P=\frac{work done(W)}{time (t)}[/tex]
=> [tex]P=\frac{596.2}{2.5} watts = 238.5 watts[/tex]
We know 746 hp = 1.0 watts
=> [tex]P=\frac{238.5}{746} hp=0.32 hp[/tex]
Thus average power developed by her is 0.32 hp
