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प्रश्न
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उत्तर
The Sl unit of power is `watt'.
If 1 joule of work is done in 1 second, Watt = `(1J)/(1S)` the power is said to be 1 watt.
संबंधित प्रश्न
The S.I. unit of power is ..........
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 |
1 H.P. is equal to
A pump raises water by spending 4×105J of energy in 10s. Find the power of the pump.
Name the physical quantity which is measured in calorie. How is it related to the S.I. unit of the quality?
An electric heater of power 3 kW is used for 10 h. How much energy does it consume? Express your answer in
- kWh,
- joule.
A bullet of mass 20 g strikes a pendulum of mass 5 kg. The centre of mass of the pendulum rises a vertical distance of 10 cm. If the bullet gets embedded into the pendulum, calculate its initial speed.
Water falls from a height of 60 m at the rate of 15 kg/s to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine? (g = 10m/s2)
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 kWh.
