The angular momentum of a flywheel having a rotational inertia of 0.14 kg m 2 ab
ID: 1981202 • Letter: T
Question
The angular momentum of a flywheel having a rotational inertia of 0.14 kg m2 about its axis decreases from 3.00 to 0.8 kgm2/s in 15 s. (a) What is the average torque acting on the flywheel about its central axis during this period? (b) Assuming a uniform angular acceleration, through what angle will the flywheel have turned? (c) How much work was done on the wheel? (d) What is the average power of the flywheel, treating it as an energy source? (i.e. what is the average amount of energy lost per second during this time)
ans: a)-1.47Nm, b) 20.4 rad, c) -29.9 J, c) 19.9W
Explanation / Answer
a)average torque=change in L/t=-0.147 N-m
please check value of time again.
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