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प्रश्न
What is the SI unit of work?
उत्तर
Joule
APPEARS IN
संबंधित प्रश्न
Name a common device where a gear train is used
Power spent by a body depends on the time for which it does work.
Give reasons for the following. No work is done if a man is pushing against a wall.
State two disadvantages of producing hydroelectricity.
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.
An object is dropped from a height H. when is its
(i) P.E. maximum,
(ii) K.E. maximum,
(iii) P.E. = K.E.?
A boy pulls a box up to 10 m with a force of 5 kgf. Calculate the work done by him.
Calculate the amount of work done by a child carrying a bag of 20 kg when he moves a distance of 40 m in
(a) Vertical direction, and
(b) Horizontal direction
(a) Define power and name its unit.
(b) A girl weighting 50 kg climbs up 60 steps each of 20 cm height in 5 minutes. Calculate the power developed.
How is horse power related to the S. I. unit of power?
Define force. Is force a scalar or a vector quantity?
Define Translational motion.
What should be the characteristic of a source of energy?
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Food grains are getting dried in the sun.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
