A car of mass 2000 kg is lifted up a distance of 30 m by a crane in 1 min. A second crane does the same job in 2 min Do the crunes consume the same or diferent amounts of fuel What is the power supplied by cacheranu? Negleat Power dissipation against friction.

Explanation

`t-(1)=1min=60s, t_(2)=2min=120s`
`W=Fs=mgs=5.88xx105J`
As both cranes do same amount of work so both consume same amount of fuel.
`p_(1)=W/t_(1)andp_(2)=W/t_(2)`
`p_(1)=9800W and p_(2)=4900W`