Question

A car of mass 2000kg is vertically lifted up with a constant velocity 20cms -1
by a crane. What is the power supplied by the crane and express it in H.P. (g =
10 ms-2)
​

Answer 1

Answer:

g

e

=

R

2

GM

(Gravitational acceleration of earth)

g

′

=

7R

2

GM

×4 (Gravitational acceleration of planet)

Weight on that planet W

′

=mg

′

=m×

7R

2

4GM

=

7

4

×

R

2

GMm

=

7

4

×mg=

7

4

W

=

7

4

×70=40kg