Advertisements
Advertisements
Question
Advertisements
Solution
APPEARS IN
RELATED QUESTIONS
An electron emitter must have _____________ work function and ___________ melting point.
Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.
When is the work done by a force on a body : (a) positive, (b) negative, and (c) zero?
The work done on an object does not depend on ______.
P, Q and R are three forces which act as shown in fig.
The point O lies in the same plane. Given, P = Q = R = 10N
(i) Which force has the least moment about O? Give a reason.
(ii)Which force has the greatest moment about O? Give a reason.
Complete the following sentences:
1 H.P. = ........ W.
A boy of mass m climbs up a staircase of vertical height h.
- What is the work done by the boy against the force of gravity?
- What would have been the work done if he uses a lift in climbing the same vertical height?
An electric motor pump is 60% efficient and is rated 2.5 H.P. Calculate the maximum load it can lift through a height of 10m in 8 sec. (1 H.P. = 750 W).
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
