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संबंधित प्रश्न
A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute, Calculate:
- the work done and
- power spent.
A body is provided at a point. A force of 20 N is applied at a distance of 40 cm from the pivot. Find the moment of force about the pivot.
Name the force needed for circular motion. What is the direction of the force?
Work done by a force is equal to the product of ....... and ....
State the condition when the work done by a force is negative. Explain with the help of examples.
A man raises a box of mass 50 kg to a height of 2 m in 20s, while another man raises the same box to the same height in 50s. Calculated:
- the work done, and
- the power developed by each man. Take g = 10 N kg-1.
Justify the statement. “Power can be expressed as the product of force and velocity.”
Relate 1 KWh (kilowatt hour) with joule.
A boy weighing 50 kgf climbs up from the first floor at a height of 3 m above the ground to the third floor at a height of 9 m above the ground. What will be the increase in his gravitational potential energy? (Take g = 10 N kg-1).
