Advertisements
Advertisements
Question
How much work is done when a body of mass m is raised to a height h above the ground?
Advertisements
Solution
We can calculate the work done against gravity in moving a body of mass (m) by a height (h) as, Work done in lifting a body = (Weight of body) (Vertical distance)
So, W = (m) (g) (h)
APPEARS IN
RELATED QUESTIONS
In each of the following a force, F is acting on an object of mass, m. The direction of displacement is from west to east, as shown by the longer arrow. Observe the diagrams carefully and state whether the work done by the force is negative, positive or zero.
Derive a relationship between S.I. and C.C.S. unit of work
A coolie does no work against the force of gravity while carrying a luggage on a road.
Work done = Force × ........................................
State two advantage of producing hydroelectricity.
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
Fill in the boxe to show the corresponding energy transformation.
How is horse power related to the S. I. unit of power?
What do you understand by the term energy? Is energy a scalar or vector? How is the energy possessed by a body measured?
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
