Advertisements
Advertisements
Question
State two factors on which power spent by a source depends. Explain your answer with examples.
Advertisements
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
How is the unit horsepower related to the S.I. unit of power?
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
What is meant by a rotatory motion? Give one example.
A body is provided at a point. A force of 20 N is applied at a distance of 40 cm from the pivot. Find the moment of force about the pivot.
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?
Name the force needed for circular motion. What is the direction of the force?
What is the work done when the force on the object and the displacement of the object are perpendicular to each other?
How much force is applied on a body when 150 J of work is done in displacing the body through a distance of 10 m in the direction of the force?
State the condition when the work done by a force is negative. Explain with the help of examples.
Derive a relation between the S.I. and C.G.S. unit of force.
