Physics
A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute.
Calculate:
(i) the work done, and
(ii) the power spent.
Related Questions
The power of a motor is 40 kW. At what speed can the motor raise a load of 20,000 N?
Rajan exerts a force of 150 N in pulling a cart at a constant speed of 10ms-1. Calculate the power exerted.
It takes 20 s for a person A of mass 50 kg to climb up the stairs, while another person B of same mass does the same in 15 s.
Compare the
(i) work done and
(ii) power developed by the persons A and B.
A boy of weighing 40 kgf climbs up a stair of 30 steps, each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes.
Compare :
(i) the work done by them, and
(ii) the power developed by them. Take g = 10 N kg-1.