Given, Power of water of pump, P=600W Efficiency of pump, η=95% Height achieved by water, h=60m Time required, t=20min=20×60s=1200s Density of water, ρ=1000kgm−3 Since, η=
Poutput
Pinput
∴Poutput =
95
100
Pinput =0.95Pinput =0.95×600=570.00W and Power (P)=
Work (W)
Time (t)
⇒ Work (W)=P×t =570×20×60=684000J and W=mgh. . . (i) where, m is mass. ∵ Density (ρ)=
Mass (m)
Volume (V)
∴m=ρV Substituting in Eq. (i), we get W=ρVgh V=