Work and Energy...

Water stored in a dam possesses:

There are $$5$$ tube-lights each of $$40\ W$$ in a house. These are used on an average for $$5\ hrs/day$$. In addition, there is an immersion heater of $$1500\ W$$ used on an average for $$1\ hr/day$$. The number of units of electricity that are consumed in a month of $$30\ days$$ is:

The electrical energy in kilowatt hours consumed in operating ten $$50\ W$$ bulbs for $$10\ hrs/day$$ in a month of $$30\ days$$ is

A pump delivers water at the rate of $$2400\ litres$$ in $$6\ minutes$$ over a head of $$12\ m$$. If $$g = 10 m/s^{2}$$, then its power is:

A man pushes a wall and fails to displace it. He does :

A car is accelerated on a leveled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car

A coconut fruit hanging high in a palm tree has ......... owing to its location.

A house is fitted with ten lamps of each $$60\ W$$. Each lamp burns for $$5\ hrs$$ a day on an average. The cost of consumption in a month of $$30\ days$$ at $$2. 80$$ rupees per unit is:

A rain drop of mass (1/10) gram falls vertically at constant speed under the influence of the forces of gravity and viscous drag. In falling through 100 m, the work done by gravity is

A girl is carrying a school bag of $$3\ kg$$ mass on her back and moves $$200\ m$$ on a leveled road. The work done against the gravitational force will be ($$g = 10\ m/s^{2}$$) :