Question

9. A disc of moment of inertia 2kg mạis acted
upon by a constant torque of 40 Nm. If it is
initially at rest, the time taken by it to acquire
an angular velocity 100 rad s is
1) 20 s 2) 10 s 3) 5s 4) 4 s​

Answer 1

Answer:

τ=Iα (where I is the moment of inertia and α is the angular acceleration)

∴40=2×α

   α=20 radians/s²

ω=ω0+αt

100=20t

∴t=100/20=5 s

Answer 2

Answer:

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