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is the greatest 2 digits perfect square....

______ is the greatest 2 digits perfect square.
a) 1
b) 4
c) 99
d) 81

Text Solution

Verified by Experts

The correct Answer is:
A, C, D
The tension in the pendulum is maximum at the mea position and minimum on th extreme postion.
`Here `1/2mv^2-0=mgl(1-costheta)`
`v^2=2gl(1-costheta)` ……….1
`-Now, T_(ma)=mg+2mg(1-costheta)`
`[T=mg+(mv^2/l)]`
`Again T_(min)=mgcostheta`
According to question
`T_(max)=2Tmin`
`rarr mg+2mg-2mgcostheta=2mgcostheta`
`rarr 3mg=4mgcostheta`
`costheta=3/4`
`rarr thetas=cos^-1 3/4`
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