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Question

Find the dimensions of

(a) angular speed ω

(b) angular acceleration α

(c) torque Γ and

(d) moment of interia I.

Some of the equations involving these quantities are

ω=θ2θ1t2t1,

α=ω2ω1t2t1

Γ=Fj and I=mr2.

The symbols have standard meanings.

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Solution

(a) Angular speed,

¯ω=ωi=[MLT1]

(b) Angular accelatration,

α=ωt=MLT2T

=[MLT2]

(c) Torque, τ=Fr=[MLT2]

[L]=[ML2T2]

(d) Moment of inertia

=Mr2=[M][L2]

=[ML2T]


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