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studentms5313
30.03.2020 •
Physics
A chain of length l and mass m lies in a pile on the floor. If its end A is raised vertically at a constant speed v, express in terms of the length y of chain that is off the floor at any given instant (a) the magnitude of the force P applied to A, (b) the reaction of the floor.
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Ответ:
Explanation:
mass per unit length = m / l
At the given instant , length of chain in air = y
mass of chain hanging in air = my / l
weight of chain = mgy / l
Let F be the force applied to pull the chain in upward direction
F - weight of chain = mass x acceleration
F - mg y / l = 0 ( acceleration is zero )
F = mg y / l
b ) Reaction of the floor = weight of chain lying on the floor
= m g - weight of chain in air
= mg - mgy / l
= mg ( 1 - y / l )
Ответ:
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