Rotational Motion Question 191

Question: A wheel having moment of inertia 2kgm2 about its vertical axis, rotates at the rate of 60 rpm about this axis. The torque which can stop the wheel’s rotation in one minute would be

Options:

A) 1.12Nm

B) 0.83Nm

C) 0.55Nm

D) 0.21 Nm

Show Answer

Answer:

Correct Answer: D

Solution:

[d]

τ×Δt=Iω

or

τ×60=2×2×60π/60τ=0.21Nm

(f=60rpmω=2πf=2π×6060)



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