Question

please answer this question ,its really urgent

Answer 1

mass of stone = 0.25kg
r = 1.5 m
w = 40 rev/min = 80π/ min = 4π/3 rad/s

Tension = centripetal force = mrw^2
Tension = 0.25×1.5×(4π/3)^2 = 6.58N

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Max tension =200 N
centripetal force = mv^2 / r

200 = 0.25×v^2 / 1.5

v^2 = 200×1.5/0.25 = 1200

v = √1200 = 34.64 m/s

Maximum speed with which stone can be whirled is 34.64 m/s