Advertisements
Advertisements
Question
The S.I. unit of work is
Options
second
metre
joule
newton
Solution
joule
APPEARS IN
RELATED QUESTIONS
A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (see the given figure). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
Work done by a boy depends on the time in which he does work.
The S.I. unit of energy is .............
What are the two kinds of mechanical energy?
Differentiate between energy and power.
The power of a motor is 40 kW. At what speed can the motor raise a load of 20,000 N?
Write the formula for work done on a body when the body moves at an angle to the direction of force. Give the meaning of each symbol used.
A man lifts a mass of 10 kg from the floor to a shelf 4 meter high. If g = 10 ms-2, what is the work done?
Can work done be zero even if force acts on the body?
Define Translational motion.
Name the material commonly used for the manufacturing of solar cells.
Explain, why submarines are able to dive underwater as well as a sail on the surface of the water?
An electric motor of power 100 W is used to drive the stirrer in a water bath. If 50% of the energy supplied to the motor is spent in stirring the water. Calculate the work done on the water in one minute.
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
An engine is pulling a train.
A body of mass 0.5 kg travels on straight line path with velocity v = (3x2 + 4) m/s. The net work done by the force during its displacement from x = 0 tox = 2 m is ______.
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
