Can someone explain this to me please?

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SUMMARY

The valid equation that requires angular measure to be expressed in radians is D: ω = Vt/r. This relationship defines angular velocity (ω) as the ratio of tangential velocity (Vt) to the radius (r) of the circular path. The discussion clarifies that Vt represents the tangential velocity of an object in circular motion, emphasizing the necessity of using radians for accurate calculations in rotational dynamics.

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  • Understanding of angular velocity and its relationship to tangential velocity
  • Knowledge of circular motion concepts
  • Familiarity with the unit conversion between degrees and radians
  • Basic grasp of kinematic equations in rotational dynamics
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  • Study the derivation of the equation ω = Vt/r in detail
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This discussion is beneficial for physics students, educators, and anyone studying rotational dynamics, particularly those seeking to deepen their understanding of angular measurements and their applications in mechanics.

gcombina
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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



I know angles can be measured in either degrees or radians

The Attempt at a Solution



angular velocity = ? divided by radius

I guess I don't understand what Vt is
 
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gcombina said:

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



I know angles can be measured in either degrees or radians

The Attempt at a Solution



angular velocity = ? divided by radius

I guess I don't understand what Vt is
How do you relate the length of an arc to the angle subtended by the arc and the radius? What should the units of each quantity be?
 
gcombina said:
I guess I don't understand what Vt is
Presumably ##V_t## will be defined in the text surrounding the problem. In this context I would imagine that it represents the tangential velocity of a rotating object at distance r from the center of rotation.
 

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