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प्रश्न
How is work done by a force measured when the force is in the direction of displacement?
उत्तर
Work = Force × Displacement of the force's application point in the force's direction,
W = F × S
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.
A body is moved in a direction opposite to the direction of force acting on it. State whether the work is done by the force or work is done against the force
A satellite revolves around the earth in a circular orbit. What is the work done by the force of gravity? Give reason.
What are the S.I. and C.G.S units of work? How are they related? Establish the relationship.
A mechanic can open a nut by applying a force of 200 N while using a lever handle of 50 cm length. How long handle is required if he wants to open it by applying a force of only 50 N?
What do you mean by a centrifugal force?
1 kWh = ______ J.
A coolie carrying a load on his head and moving on a frictionless horizontal platform does no work. Explain the reason why.
A coolie carries a load of 30 kgf through a distance of 500 m in 5 minutes while another coolie B carries the same load through the same distance in 10 minutes. Compare the
(i) work done, and
(ii) power developed. (Take: g = 10md−2)
A force of 1 kgf displaces a body by a distance of 10 cm
(i) in direction of force,
(ii) normal to the force
(iii) at an angle of 60° to the direction of the force.
Calculate the amount of work done in each case. (Take: g = 9.8 ms−2 )
