Advertisements
Advertisements
Question
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 ______
Options
v
v2
v3
v4
Solution
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 v3.
APPEARS IN
RELATED QUESTIONS
Power P= ............ /time taken.
Two coolies A and B do some work in time 1 minute and 2 minute respectively. The power spent is
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 power spent by then.
Choose one or more correct alternatives.
Power is a measure of the ______.
- The rapidity with which work is done.
- Amount of energy required to perform the work.
- The slowness with which work is performed.
- Length of time.
A ball with a velocity of 5 ms−1 impinges at an angle of 60˚ with the vertical on a smooth horizontal plane. If the coefficient of restitution is 0.5, find the velocity and direction after the impact.
Calculate the power of a crane in watts, which lifts a mass of 100 kg to a height of 10 m in 20s.
Unit of power used in mechanical engineering is ______.
Name the quantity which is measured in kWh.
Name the quantity which is measured in kW.
Name the quantity which is measured in Wh.