1thanks everyone .............................
in the arrangement shown, the ends P & Q of an unstrecthable string move downwards with uniform speed U. pulleys A & B are fixed.
find the speed with which mass M moves upwards ?
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UP 0 DOWN 0 0 8
8 Answers
1357take the net workdone by tension as zero...
2UT+Vcosθ(2T)=0
Thus,
v=u/cosθ
1plz explain bhaiyya how net workdone by tension = zero
the mass is rising isn't it [7]
62Take the system as all the pulley and the end of the string too...
tension is an internal force.
Work done by internal forces is zero...
Take work done as
F.s on each of the points on the string...
There is zero net force at a points within the string... because the string is massless.