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RICHA PANDEY

· started a discussion

· 1 Months ago

zero kaise ? (Question: 298763.0 )

answer 0 kaise aayega,detail me btana chahiye apko.

Question:

A sphere of mass m is tied to one end of a string of length  and roated through the other end along a horizontal circular path with speed v. The work done in half horizontal circle is :-

Options:
A)

Zero

B)

mv2l    2πl

C)

 

mv2l    πl

D)

 

mv2l   l

Solution:

Ans: (a) Zero

MANISH PANDEY

· commented

· 1 Months ago

W=F.d.cos(theta) as we know direction of force always tangnential means 90 degree so cos(90degree)= 0
so work done =0
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