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.A man raises a box of mass 50kg to a height of 2m in 20s, while another man raises the same box to the same height in 50s. Compare:
(i) the work done, and
(ii) the power developed by them.
A force of 50 N acts on a body and moves it a distance of 4 m on horizontal surface. Calculate the work done if the direction of force is at an angle of 60° to the horizontal surface.
Choose one or more correct alternatives.
For work to be performed, energy must be ______.
- transferred from one place to another
- concentrated
- transformed from one type to another
- destroyed
A man lifts a mass of 10 kg from the floor to a shelf 4 meter high. If g = 10 ms-2, what is the work done?
A body does 20 J of work in 10 s. What is its power?
How fast should a boy weighting 30 kg run so that his kinetic energy is 375 joule?
Why is less effort needed to lift a load over an inclined plane as compared to lifting the load directly?
Write the two main conditions are needed for work to be done?
