Power

The power required to keep the particle of mass 1kg in a circle of radius 1 m with speed 1m/s is:

A motor of vacuum cleaner has a rating of $600$ Watts. The amount of work done in one minute is?

One horsepower is equal to $200 \mathrm{watt}$.

Explain the term power in terms of energy.

A lamp consumes $1000 \mathrm{J}$ of electrical energy in $10 \mathrm{s}$. What is its power. Convert the power to watt.

A person of mass $100 \mathrm{kg}$ reaches a height in $10 \mathrm{seconds}$. Find the power used by the person ($g=10 \raisebox{1ex}{$\mathrm{m}$}\!\left/ \!\raisebox{-1ex}{${\mathrm{s}}^2$}\right.$).

A boy of mass $50 \mathrm{kg}$ runs a stair case of $45$ steps in $9 \sec$. If the height of each steps is $15 \mathrm{cm}$, find his power. (Take $\mathrm{g}=10 {\mathrm{ms}}^{-2}$).

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.

Two rifles fire the same number of bullets in a given interval of time. The second riffle fires bullets of mass twice that fired by the first, and with a velocity that is half that of the first. The ratio of their powers is : 

You have the following appliances each of 500 W running on 220 V ac.

Two heaters, each marked 1000 W, 250V are connected in series with a 250 V supply. Assuming that their resistance remains constant, their combined rate of heating will be

Five equal resistors when connected in series dissipated 5 W power. If they are connected in parallel, the power dissipated will be

Two electric bulbs A and B are designed for the same voltage. Their power ratings are PA and PB respectively with PA<PB If they are joined in series across a V-volt supply

If R1 and R2 are the filament resistances of a 200 W and a 100 w bulb respectively, both designed to run at the same voltage, then

Heat developed in an electric wire of resistance R ohm by current l ampere for a timer t second is

A 2 KW boiler used for 1 hour everyday consumes the electrical energy for the whole month of April. The number of units consumed is

What should be the power of the Motorboat if it is desired to get a steady speed of 72 km/h we know that resistance by water is of the order of 5000 N N 

When water is flowing through a pipe with a speed of$V$, then its power is proportional to