Advertisements
Advertisements
प्रश्न
1 H.P. is equal to
पर्याय
1 W
1 J
746 J
746 W
Advertisements
उत्तर
746 W
APPEARS IN
संबंधित प्रश्न
A pump on the ground floor of a building can pump up water to fill a tank of volume 30 m3 in 15 min. If the tank is 40 m above the ground, and the efficiency of the pump is 30%, how much electric power is consumed by the pump?
The blades of a windmill sweep out a circle of area A.
- If the wind flows at a velocity v perpendicular to the circle, what is the mass of the air passing through it in time t?
- What is the kinetic energy of the air?
- Assume that the windmill converts 25% of the wind’s energy into electrical energy, and that A = 30 m2, v = 36 km/h and the density of air is 1.2 kg m–3. What is the electrical power produced?
Match the following
| column A | Column B |
| A stone at a height | power |
| A Moving ball | joule |
| Energy | work done in 1 s |
| Power | potential energy |
| Watt | kinetic energy |
It takes 20 s for a girl A to climb up the stairs while girl B takes 15 s for the same job. Compare the work done .
Differentiate between watt and watt hour.
An electric pump has 2 kW power. How much water will the pump lift every minute to a height of 10 m?
Calculate the power of a crane in watts, which lifts a mass of 100 kg to a height of 10 m in 20s.
The average work done by a human heart while it beats once is 0.5 J. Calculate the power used by heart if it beats 72 times in a minute.
Name the quantity which is measured in kW.
Name the quantity which is measured in Wh.
