## workin_daily 3 years ago Ok, this is quite a big one.. I just need to know what formulas to use for certain parts of the question: Matty the moth is on a turntable spinning at (2 3/8) rotations in 8 seconds. Bob is 11cm away from the center. A)Find the angular displacement of Bob. B)Find the angular velocity in rads per second. C)Find the distance that Bob traveled in 8 seconds. D)Find the linear velocity of Bob in cm per second.

1. workin_daily

I already have the answers, just need the formulas and/or some examples of what to do -- studying.

2. moongazer

$\omega=\theta/t$ $l=s/t$

3. moongazer

w is the angular velocity. l is the linear velocity. s is the arc length you can also make another equation for l by using those formula $s=\theta r$

4. moongazer

so l is also $l=\omega r$

5. workin_daily

Thanks for the help

6. moongazer

also do not forget to convert revolutions (rev) to radians . theta should be in radians you can convert it by multiplying to 2pi

7. workin_daily

$\theta=revs \times2\pi rads$ Correct?

8. moongazer

yes, do you know why it is correct ?

9. workin_daily

10. moongazer

correct :)

11. workin_daily

I guess i have been paying enough attention in trig haha, thanks again

12. moongazer

your'e welcome :)