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InterviewSolution
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An autmobile moves on road with a speed of `54 km//h`. The radius of its wheel is `0.45 m` and the moment of inertia of the wheel about its axis of rotation is `3 kg m^(2)`. If the vehicle is brought to rest in `15 s`, the magnitude of average torque tansmitted by its brakes to the wheel is :A. 2.86 kg `m^(2)s^(-2)`B. 6.66 kg `m^(2)s^(-2)`C. 8.58 kg `m^(2)s^(-2)`D. 10.86 kg `m^(2)s^(-2)` |
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Answer» Correct Answer - B `V=54(km)/(h)=15m//s` `omega_(0)=(v)/(r)=(15)/(.45)(rad)/(s),omega=0` `omega=omega_(0)+alphat` `0=(15)/(.45)+alpha15` `alpha=-(15)/(.45xx15)=-(1)/(.45)(rad)/(s^(2))` `tau=I alpha=(3)/(.45)=-(300)/(45)=-6.66kgm^(2)//s^(2)` |
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