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A body of mass 1 kg starts moving from rest at t= 0, in a circular path of radius 8 m. Its kinetic energy varies as a function of time as : K.E. = 2t2 Joules, where t is in seconds. ThenA tangential acceleration = 4 m/s2(B) power of all forces at t = 2 sec is 8 watt(C) first round is completed in 2 sec.(D) tangential force at t = 2 sec is 4 newton. |
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Answer» body of mass 1 kg STARTS moving from rest at t= 0, in a circular path of radius 8 m. Its kinetic energy VARIES as a function of time as : K.E. = 2t² J.To find:Correct Option among the above ?Calculation:So, TANGENTIAL acceleration will ALWAYS be 2 m/s².So, first round is completed in 4√π SEC. |
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