Answer to Question #158244 in Classical Mechanics for Jay mishra

Question #158244

Four point masses of mass each of 1 kg are connected by a string which forms a square of diagonal 0.707 m . If square is placed on rotating table rotating with 5 rotation per second then what is the tension in string ?


1
Expert's answer
2021-01-25T13:56:04-0500

Answer

Given diagonal =0.707 meter

Lets take length of square is a meter diagonal will be

2\sqrt{2} a meter


2a\sqrt{2}a =0.707 meter

a=0.5 meter


Rotation is w=5 rps

=5×2π=10πrad/s

We all know that

Radius for revolution = half of diagonal

=a2=\frac{a}{\sqrt{2}}

So we can write

2Tcos45°=mw2r2T\cos 45^°=mw^2r

Putting value of m, w, r then the tension

T=246.8N


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