1.

a mass of 2kg is whirled in a horizontal circle by means of a string at an initial speed 5 r.p.m. keeping the radius constant the tension in the string is doubled. the new speed is nearly..

Answer»

Tension = Centripetal FORCE

Centripetal Force = Mass x Velocity^2 / Radius

Mass cannot CHANGE and radius is KEPT CONSTANT

So, velocity has to change

Velcoty change =2

Since its Velocity squared answer is √2 times 5 R.P.M

=5√2 R.P.M


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