Advertisements
Advertisements
Question
In which of the following cases is work being done:
- A boy pushing a heavy rock
- A boy climbing up the stairs
- A coolie standing with a box on his head
- A girl moving on the road.
Advertisements
Solution
work being done in the following cases
(b) A boy climbing up the stairs
(d) A girl moving on the road.
APPEARS IN
RELATED QUESTIONS
Work done by a boy depends on the time in which he does work.
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. If the value of g be 10 m/s2, the work done by the girl against the gravitational force will be :
The work done on an object does not depend on the :
Why does a spanner have a long handle?
Define 'joule'.
A body does 20 J of work in 10 s. What is its power?
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.
A is a push or a pull ______.
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)
