Advertisements
Advertisements
Question
A man having a box on his head, climbs up a slope and another man having an identical box walks the same distance on a levelled road.
Who does more work against the force of gravity and why?
Advertisements
Solution
Man having a box on his head who climbs up a slope does more work against the force of gravity because he has more potential energy by virtue of his position i.e., height.
As, P.E. = W.D. = F × S
= mg × h
APPEARS IN
RELATED QUESTIONS
Give the expression for mechanical advantage of an inclined plane in terms of the length of an inclined plane.
When a body moves in a circular path, how much work is done by the body? Give reason.
(Hint: The body is acted upon by the centripetal force.)
The work done by a fielder when he takes a catch in a cricket match, is negative. Explain.
How is kilowatt hour related to joule?
A man spends 7.4 KJ energy in displacing a body by 74 m in the direction in which he applies force in 2.5 s. Calculate the force applied.
Name two places in india where electricity is generated from nuclear power plants.
Work done by a force is equal to the product of ....... and ....
What do you understand by work? Is work a scalar or a vector quantity?
State the C.G.S. unit of work. How it is related to its S.I. unit?
