Advertisements
Advertisements
Question
It takes 20 s for a girl A to climb up the stairs while girl B takes 15 s for the same job. Compare the work done .
Solution
As height is the same for both girls A and B, work done is the same (irrespective of time)
∴ Work done by A : Work done by B = 1:1
APPEARS IN
RELATED QUESTIONS
A body is moving unidirectionally under the influence of a source of constant power. Its displacement in time t is proportional to ______.
The S.I. unit of power is ..........
Two coolies A and B do some work in time 1 minute and 2 minute respectively. The power spent is
A pump raises water by spending 4×105J of energy in 10s. Find the power of the pump.
A wind-powered generator converts wind energy into electric energy. Assume that the generator converts a fixed fraction of the wind energy intercepted by its blades into electrical energy. For wind speed v, the electrical power output will be proportional to ______
Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (g = 10 m/s2)
Calculate the power of a crane in watts, which lifts a mass of 100 kg to a height of 10 m in 20s.
Sand is being dropped from a stationary dropper at a rate of 0.5 kgs-1 on a conveyor belt moving with a velocity of 5 ms-1. The power needed to keep belt moving with the same velocity will be ______.
Unit of power used in mechanical engineering is ______.
Name the quantity which is measured in eV.
