07. Acord is used to lower vertically a block of mass M, a distance d at a constant downward acceleration
of g/ 4, then the work done by the cord on the block is
3Med
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Explanation:
work done by cord is = work done by tension
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Answer:
The work done by the cord on the block is - 3 Mg d/4.
Explanation:
Given: Mass = M
displacement = d
downward acceleration g/4.
To find: Work done by the cord.
Solution: Through the concept of #Pseudo Force, we know that:
Tension, T = m (g-a)
For the above case:
T = M ( g - g /4)
T = 3 Mg/4
#For work done, we know that:
W = F s cos∅
W = 3 Mg/4 × d × cos 180°
[∵ T = F = 3 Mg/4 and ∅ = 180° for the cord is descending straightly]
W = - 3 Mg d/4
Hence, the work done by the cord on the block is - 3 Mg d/4.
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