Angular Acceleration

  • #1

Homework Statement



A cyclist starts from rest and pedals so that the wheels make 8.5 revolutions in the first 4.5 s. What is the angular acceleration of the wheels (assumed constant)?



Homework Equations



[tex]\alpha[/tex] = [tex]\Delta[/tex][tex]\omega[/tex]/ [tex]\Delta[/tex]t



The Attempt at a Solution



I converted 8.5 to radians and divided by 4.5. BUT I CANT GET THE RIGHT ANSWER!!
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
8
Use the formula
θ = ωο*t + 1/2*α*t^2 and find α.
 
  • #3
So, I do that and I get .839. I kept 8.5 as my theta. It still isn't right. What could I be doing wrong?
 
  • #4
rl.bhat
Homework Helper
4,433
8
No. The angular displacement θ = 2*π*n, where n is the number of revolutions per second.
 

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