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A boy of mass 40 kg climbs a staircase o...

A boy of mass 40 kg climbs a staircase of 30 steps, each of 0.2 m height, in 30 s. Calculate power. `(g=9.8ms^(-2))`

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78.4 W
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KUMAR PRAKASHAN-WORK AND ENERGY -QUESTION & ANSWER (ADDITIONAL NUMERICALS FOR PRACTICE)
  1. Hetasvi, having her own mass 50 kg, climbs 20 m height along with 30 k...

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  2. 5 tubelights each of 40 W are operated by 10 hour. Calculate electrica...

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  3. A boy of mass 40 kg climbs a staircase of 30 steps, each of 0.2 m heig...

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  4. A lady pulls a bucket filled with water having mass 10kg from a well 8...

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  5. A car having mass 1000 kg is moving with speed of 36kmh^(-1). Calculat...

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  6. The pendulum shown in the figure is kept horizontal. It is released fr...

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  7. In a residence 4 tubelights each of 40W are operated daily for 5 hour ...

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  8. A rocket is moving in upward direction with the velocity v, suddenly i...

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  9. Avinash is moving with the velocity 8ms^(-1) against the frictional fo...

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  10. The power of a water pump is 2 kW. How much amount of water can it rai...

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  11. Suppose the weight of a man on the planet A is half than that on the e...

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  12. A ball is falling freely from the height 10 m. On striking the ground ...

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  13. The power of an electric iron is 1200 W. It is used daily for 30 minut...

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  14. The momentam of a light and heavy objects are same. Find the ratio of ...

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  15. Car A of mass 1000 kg moves on a horizontal straight road with speed 3...

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  16. A girl of mass 35 kg is sitting in a trolley of mass 5 kg. By applying...

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  17. Four men lift a 250 kg box to a height of 1 m and hold it without rais...

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  18. The height of 'Jog fall' in Karnataka state is 250 m high. 2000 ton wa...

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  19. A man works with the constant power 100 W. How much mass of an object ...

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  20. A car-engine of mass 150 kg spends 500 W power for 1 kg mass. How much...

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