Help me please. Radian (question 15)

  • Thread starter gcombina
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  • #1
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Homework Statement


Which equation is valid only when the angular measure is expressed in radians?

a) α = Δθ / Δt

b) ω= Δω / Δt

c) ω^2 = ωo^2 + 2αθ

d) ω = Vt/r (here T is a subscript)

e) θ = 1/2αt^2 + ωαt

Answer is D but why??



Homework Equations




The Attempt at a Solution


a) α = Δθ / Δt

Can we please go over each option?

OK looking at option a, it does give me an alpha so I don't know what to think of this. Then it says (Alpha = Change of angle/change in time). This seems to be the formula for "angular velocity" but what is alpha? can we go over this first? what is alpha?
 

Answers and Replies

  • #2
haruspex
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a) and b) are typos. a) should be "##\omega=##" and b) should be "##\alpha=##". ##\alpha## is angular acceleration.
Does the answer make sense now?
 

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