Advertisements
Advertisements
प्रश्न
Advertisements
उत्तर
If 1 joule of work is done in 1 second, the power is said to be 1 watt.
1 H.P. = 746 watt
APPEARS IN
संबंधित प्रश्न
Give reasons for the following A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work.
Explain degradation of energy by taking two examples of your daily life.
A boy throws a rubber ball vertically upwards. What type of work, positive or negative, is done : by the force applied by the boy?
(a) by the force applied by the boy?
(b) by the gravitational force of earth?
What do you mean by a kilo joule?
Give an example
Chemical energy changes to heat energy.
A block of mass 30 kg is pulled up a slope, as shown in diagram with a constant speed, by applying a force of 200 N parallel to slope.
A and B are initial and final positions of block.
(i) Calculate the work done by force in moving the block from A to B.
(ii) Calculate P.E. gained by block. [g=10ms-2]
How long should an electric motor, of power 2 H.P. operate, so as to pump 5 m3 of water from a depth of 15m. [Take g = 10 N kg−1]
________ is said to be done when a force is acting on it.
