Power
Trending Questions
Q.
A woman pulls a bucket of water of total mass 5 kg from a well which is 10 m deep in 10 s. Calculate the power used by her.
Q.
Calculate the power of a pump which can lift 100 kg of water to store it in a water tank at a height of 19 m in 25 s? (Take the value of g = 10 m/s2.)
Q.
If the speed of an object doubles, its kinetic energy becomes
Q.
If a man lifts a load up with the help of a rope such that it raises a load of mass to a height of in seconds. Find the power of man. (Take ).
Q.
What is the function of the following in an electric motor?
a) Carbon brushes
b) Split rings
Q.
The unit of power is
watt per second
joule
kilojoule
watt
Q. 1kWh=1volt×1ampere×Z1000, What is the value of Z?
- 1 hour
- 1 min
- 1 sec
- None of these
Q. Assertion :The power of a pump which raises 100kg of water in 10sec to a height of 100m is 10KW. Reason: The practical unit of power is horse power.
- Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
- Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
- Assertion is correct but Reason is incorrect
- Both Assertion and Reason are incorrect