Advertisements
Advertisements
Question
Is work done a scalar or a vector physical quantity?
Advertisements
Solution
Work is a scalar quantity because it is a measure of transfer of energy without indicating any direction.
APPEARS IN
RELATED QUESTIONS
A weight lifter lifted a load of 200 kgf to a height of 2.5 m in 5 s. Calculate:
- the work done, and
- the power developed by him. Take g = 10 N kg-1
The velocity of a car increases from 54 km/hr to 72 km/hr. How much is the work done if the mass of the car is 1500 kg?
A body does 20 J of work in 10 s. What is its power?
In the following case write yes, if the work is being done and no if no work is being done.
A coolie standing with a heavy load on his head
How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m3 of water from a depth of 15m. [Take g = 10 N kg−1]
Look at the activity below. Reason out whether or not work is done in the light of your understanding of the term ‘work’.
Suma is swimming in a pond.
What is power? How do you differentiate kilowatt from kilowatt-hour? The Jog Falls in Karnataka state are nearly 20 m high. 2000 tonnes of waterfalls from it in a minute. Calculate the equivalent power if all this energy can be utilized? (g = 10 m s–2)
State whether work is done or not, by writing yes or no, in the following case:
A man pushes a wall.
