Assignment Submission For this assignment you submit answers by question parts T

Question

Assignment Submission For this assignment you submit answers by question parts The number of sutmissions remaining for each question part only changes if you submit or change the answer Assignment Scoring Your last submission is used for your score At its peak, a tornado is 70.0 m in diameter and carries 300 km/h winds. What is its angular velocity in revolutions per second? x rev/s Reading points OSCoPhyst 10 2.005 A phonograph record accelerates from rest to 47.4 rpm in 3.00 s (a) What is its angular acceleration in rad/s2? ad/s (b) How many revolutions does it go through in the process?

Explanation / Answer

1.

v = 300 x 1000 m / 3600s = 83.33 m/s

w = v /r = 83.33 / 70 = 1.19 rad/s

w (in rev /s) = 1.19/2pi rev/s = 0.19 rev/s

2. w0 = 0

wf = 47.5 x 2pi rad / 60 s = 4.96 rad/s

(A) wf = w0 + alpha t

4.96 = 0 + 3 alpha

alpha = 1.65 rad/s^2

(B) wf^2 - wi^2 = 2 alpha (2 pi rev)

rev = 4.96^2 / (4 pi 1.65)

= 1.18 rev

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