Starting from rest, a spinning disk accelerates constantly to a final rotational speed, ω , in a period of time, Δ Δ t. What expression best represents the revolutions the disk has turned through? A) ω Δ Δ t /2 π B) Δ4 ω Δ t 4 π C)Δ22 ω Δ t 2 2 D) Δ ω Δ t E) 2Δ 2 π ω Δ t

the correct one is B,   θ  =    w t    [rev]

Explanation:

This is a rotational kinematics exercise

        w = w₀ + α t

        w² = w₀² + 2 α θ

indicate that part of rest whereby the initial angular velocity is zero

        w = α t       -> α = w/t

        w² = 2 α θ

we substitute

        w² = 2 (w / t) θ

         w = 2 θ / t

        θ = w t / 2

This angle is given in radians, let's reduce to revolutions = 2π rad = 1 rev

        θ = w t / 2 rad (1 rev / 2π rad)

        θ  =    w t    [rev]

when checking the answers, the correct one is B, even though he has some mistakes in his writing

b

explanation:

energy can be converted from one form to another, but it cannot be created or destroyed in ordinary chemical or physical means. do not understand what you are asking but hope this