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प्रश्न
In the following case write yes, if the work is being done and no if no work is being done.
A boy climbing up a staircase.
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उत्तर
Yes.
संबंधित प्रश्न
When does a force perform work?
Give reasons for the following. No work is done if a man is pushing against a wall.
A boy weighing 25 kgf climbs up from the first floor at height 3 m above the ground to the third floor at height 9m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg -1)
A car is being driven by a force of 2.5 ✕ 1010 N. Travelling at a constant speed of 5 m/s, it takes 2 minutes to reach a certain place. Calculate the work done.
Give two examples of couple actions in our daily life.
A girl of mass 50 kg runs up a flight of 40 steps in 20 seconds. If each step in 20 cm high, calculate the power developed by the girl. (g= 10 ms-2).
Fill in the boxe to show the corresponding energy transformation.
A canon ball of mass 500g is fired with a speed of 15m/s-1. Find: its momentum.
A man climbs a slope and another walks same distance on level road. Which of the two expends more energy and why?
What should be the characteristic of a source of energy?
