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/sci/ - Science & Math

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2146310 No.2146310 [Reply] [Original]

Help i have homework due, but i dont even know were to start on this problem.

a 50kg rider is on a moped of mass 75kg is traveling with a speed of 20m/s. each of the two wheels of the moped has a radius of 0.2m and a moment of inertia of 0.2kg*m^2.
what is the total rotational kinetic energy

>> No.2146320

well i'm not gonna solve this for you but i'll try and get you started.
first off, the mass of the rider and the bike don't matter so ignore it. convert the tangential velocity into angular velocity. rotational kinetic energy is 1/2 Iw^2 where I is moment of inertia and w is angular velocity. look up moment of inertia for a disk and you should be able to finish the rest.

>> No.2146321
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2146321

what would i have to do to entice you into answering me?

>> No.2146328

um ok ill try that brb

>> No.2146334
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2146334

>>2146320
thanks man you were a lot of help