Posted by **Victor** on Monday, December 21, 2009 at 7:50pm.

Could someone please help me with this question. Thank you

The person makes a spin through the air, increasing the angular velocity from 3.0 to 5.0 rev/s while rotating through 1/2 revolution. How much time does this it take ?

- Physics -
**bobpursley**, Monday, December 21, 2009 at 7:55pm
wfinal^2=winitial^2+ 2*angacceleration*displacement

displacement is PI radians

Wf=2PI*5rad/sec wi= 2PI*3 rad/sec

solve for angular dcceleration,then

angacceleration= (wf-wi)/time

and solve for time.

- Physics -
**Victor**, Monday, December 21, 2009 at 8:18pm
Im lost is there anyway you can solve this question for me? I know I should try by myself but I get ridiculous answers that defently do not make sense. I know how to solve for Wf which is .5235 and Wi .314159 but then Im lost

## Answer this Question

## Related Questions

- Physics - A gymnast is performing a floor routine. In a tumbling run she spins ...
- Physics - A baton twirler tosses a baton into the air with an initial angular ...
- science- physics - A rotating wheel requires 4.17 s to rotate through 37 rev. ...
- Physics - Ans in revs. The tub of a washer goes into its spin- dry cycle, ...
- physics - (a) Calculate the angular momentum of an ice skater spinning at 6.00 ...
- Physics - . (a) Calculate the angular momentum of an ice skater spinning at 6.00...
- College Physic - The tub of a washer goes into its spin cycle, starting from ...
- physics help please - The tub of a washer goes into its spin-dry cycle, starting...
- Physics - A 60-cm-long, 500 g bar rotates in a horizontal plane on an axle that ...
- physics - The tub of a washer goes into its spin-dry cycle, starting from rest ...