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.

A car of mass 2000 kg is lifted up a distance of 30 m by a crane in 1

1.	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.
Answer» SOLUTION :`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`