A uniform chain of mass m and length l is lying on table with ¼ of its length hanging freely from the edge. Find the amount of work to be done in dragging the chain on the table completely. A student throws a ball vertically upwards so that its just reaches the height of window on the second floor of a dormitory. At the same time the ball is thrown upwards a student at the window drops a ball. Are the mechanical energies of the balls the same at half the height of the window?
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Explanation:
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Answered by
3
Answer:
The weight of hanging part (
3
L
) of chain is (
3
1
Mg). This weight acts at centre of gravity of the hanging part, which is at a distance of (
6
L
) from the table.
As work done =force×distance
∴W=
3
Mg
×
6
L
=
18
MgL
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