1.

A particle of mass m is executing S.H.M. about a point with amplitude 10 cm. Its maximum velocity is 100 cm s^(-1). Its velocity will be 50 cm s^(-1) at a distance :

Answer»

5 CM
`5sqrt(2)` cm
`5sqrt(3)` cm
`(10)/(SQRT(2))` cm.

Solution :`v_("max")=ROMEGA`.
`100=10.oemgaimpliesomega=10" rad"//"s"`.
Now `v^(2)=OMEGA^(2)(r^(2)-y^(2))`.
`:.""2500=100(100-y^(2))`
`y^(2)=100-25=75`
`y=5sqrt(3)` cm.
Aliter. We can use the formula that at `y=(sqrt(3))/(2)r`
`v=(v_("max"))/(2)`
`:.""y=(sqrt(3))/(2)xx10=5sqrt(3)" cm"`.
So the correct choice is ( c ).


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