Power

A cylindrical barrel is buried vertically in the ground with its opening at the ground level. The area of cross-section of the barrel is $1 {\mathrm{m}}^2$. The depth of a barrel is $1.5 \mathrm{m}$. It is full of water. Find the work done in bailing out the water.

Find the power of the engine deployed to lift water at the rate of $5 \mathrm{liters}$ of water in one second through an average height of $10 \mathrm{m}$ from a well of depth$10 \mathrm{m}$ . Assume $10\%$ of the power of the engine is wasted.

A $60-\mathrm{watt}$ bulb is switched on $24 \mathrm{hours}$ a day and there is another $60-\mathrm{watt}$ bulb that is turned on for only $12 \mathrm{hours}$. Find the energy consumed by both the bulbs in one day. Find the energy consumed in horsepower.

_____ is the SI unit of power.

_____ is defined as the rate of doing work.

One Horsepower is $746 \mathrm{Watt}$ and a car is labelled $75 \mathrm{Hp}$. How many joules of energy does it use in one second?

If the power of a motor is $40 \mathrm{kW}$, at what speed can it raise a load of $20,000 \mathrm{N}$?

A magnetic crane raises a load of $400 \mathrm{kg}$ to a height of $10 \mathrm{m}$ in one minute. Calculate the power of the crane in kilowatts upto four decimal points. ($g = 9.8 \mathrm{m}/{\mathrm{s}}^2$)

A crane lifts a mass of $100\mathrm{ }\mathrm{kg}$ to a height of $10 \mathrm{m}$ in $20 \mathrm{s}$. The power of the crane is _____ $\mathrm{W}$.
$(\mathrm{Take} g=10 \mathrm{m} {\mathrm{s}}^{-2})$

$1 \mathrm{hp}=$______ $\mathrm{watts}$.

The SI unit of _____ is Joule per second.

(Choose from: Power/Work)

An electric heater of $1000 \mathrm{W}$ is used everyday for $70 \mathrm{minutes}$. Calculate the units of electrical energy this heater will consume in $30 \mathrm{days}$ of use. (Give the answer in $\mathrm{kWh}$)

Power is defined as rate of doing _____.

One Horsepower is $746 \mathrm{Watt}$ and a car is labelled $75 \mathrm{Hp}$. How many joules of energy does it use in one second?

An engine moves an object of $200 \mathrm{kg}$ mass to a height of  $50 \mathrm{m}$ in $10$ seconds. Find the power of the engine. ($g=10 \mathrm{m} {\mathrm{s}}^{-2}$).

It takes $1 \mathrm{minute}$ to uplift a $30 \mathrm{kg}$ object to a height of $2 \mathrm{m}$. Calculate the power used.

What is power? Write unit of the power?

Unit of power is

An electric heater is rated $1500 \mathrm{W}$. How much energy does it use in $10$ hours?

Define average power.