Work and Energy...

Convert $$28.8  kJ$$ into kilo watt hour.

Calculate the monthly bill if a heater of 100 watt is used at the rate of rs. 1 per unit for 1 hour daily.

Commercial unit of energy is .......................

What is law of conservation of energy?

An object of mass $$40\ kg$$ is raised to a height of $$5\ m$$ above ground. If the object is allowed to fall down find its kinetic energy when it is half-way down.

A weight-lifter lifts a weight of $$2000N$$ straight up to a height of $$2.25\ m$$ in $$65$$ seconds. The weight-lifter kept holding the weight at the same height for the next $$4$$ seconds before dropping it to the floor. Find out how much work did the weight lifter do while holding the weights overhead for $$4$$ seconds ?

All types of energy that exist in the nature can be categorized as either kinetic or potential. Choose correct statement regarding the validity of above sentence.

If $$120J$$ of work is done in $$2$$ minutes by a water pump, the power of the pump is:

A car standing at the top of a hill would be an example of what type of energy?

Find out work done by a person in pushing a box with a force of $$10\ N$$ over a distance of $$4.0\ m$$ in the direction of the force?