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संबंधित प्रश्न
A boy weighing 40 kgf climbs up a stair of 30 steps each 20 cm high in 4 minutes and a girl weighing 30 kgf does the same in 3 minutes. Compare:
- The work done by them.
- The power developed by them.
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
Differentiate between work and power.
What is meant by a rotatory motion? Give one example.
State the factors on which moment of force about a point depends.
A bullet fired against a window glass pane makes a hole in it without any cracks while a stone striking the same glass pane smashes it; explain with reason.
What do you understand by work? Is work a scalar or a vector quantity?
Justify the statement. “Power can be expressed as the product of force and velocity.”
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).
