0 votes
in Physics by (71.7k points)

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 cranes consume the same or different amounts of fuel ? What is the power supplied by each crane ? Neglect Power dissipation against friction.

1 Answer

+1 vote
by (69.9k points)
selected by
Best answer

t1 = 1 min = 60 s, t2 = 2 min = 120 s 

W = Fs = mgs = 5·88 × 105

As both cranes do same amount of work so both consume same amount of fuel.

∴ P1 = 9800 W & P2 = 4900 W.

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.