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State two factors on which the work done on a body depends.
A machine raises a load of 750 N through a height of 16 m in 5 s. calculate:
- energy spent by machine,
- power at which the machine works.
A water pump raises 50 litres of water through a height of 25 m in 5 s. Calculate the power of the pump required.
(Take g = 10 N kg-1 and density of water = 1000 kg m-3)
State two advantage of producing hydroelectricity.
Choose one or more correct alternatives.
For work to be performed, energy must be ______.
- transferred from one place to another
- concentrated
- transformed from one type to another
- destroyed
How many joules are there in 1 mega joule?
State the energy changes which take place when An electric bulb glows when it is connected to a source of electric current.
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
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.
