Advertisements
Advertisements
Question
State two factors on which power spent by a source depends. Explain your answer with examples.
Solution
A source's use of power depends on two things:
- The amount of work done by the source, and
- The time taken by the source to do the said work.
Example: Should a coolie A take one minute to raise a load to a bus roof, and another coolie B take two minutes to do the same, Both coolies accomplish the same amount of work; however, because coolie A works more quickly, the power expended by him is double that of coolie B.
APPEARS IN
RELATED QUESTIONS
The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.
Give an example when work done by the force of gravity acting on a body is zero even though the body gets displaced from its initial position.
A mechanic can open a nut by applying a force of 200 N while using a lever handle of 50 cm length. How long handle is required if he wants to open it by applying a force of only 50 N?
What is a centripetal force?
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction
State the condition when the work done by a force is negative. Explain with the help of examples.
State and define the unit of force in the S.I. system.
In the following case write yes, if the work is being done and no if no work is being done.
A man moving on the rough ground.
State two conditions for work to be done.
