What is the average angular velocity?

  • Thread starter saturn67
  • Start date
  • #1
saturn67
54
0
The angle through which a rotating wheel has turned in time t is given by \
theta = a t - b t^2+ c t^4, where theta is in radians and t in seconds.

What is the average angular velocity between t = 2.0 s and t =3.3 s?
If a = 9.0 rad/s, b = 16.0 rad/s^2, c = 1.6 rad/s^4

Homework Equations


d(theta)/dt = omega

omega average = change in theta / change in time

The Attempt at a Solution



omega =a-2bt+4ct^3

i got omega = 63.1 rad/s (omega =a-2bt+4ct^3 )

and 2nd time i got 19.0826 (change in theta / change in time)


both is wrong when i put on the webs

can anyone help me please
 

Answers and Replies

  • #2
moxy
41
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Since it's asking for an average, you should use the second equation you listed. I don't know how you got the answer you posted, but using the values you are given for t, find your initial and final thetas. Change in theta is final minus initial.

Write it all out...perhaps you put it into your calculator incorrectly?
 
  • #3
saturn67
54
0
change in theta / change in time

yep this work answer is 50

45-(-20) = 65/1.3 = 50

i put in 45-20 on my calc that why is wrong thank for help
 

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