# Math Help - Finding angular displacement.

1. ## Finding angular displacement.

Hello,
Need help on how to set this up and the answer, so I can study it to understand it.

A shaft whose diameter is 10 cm rotates with an angular speed of 1.00 rad / second. Calculate the angular displacement IN RADIANS, if the shaft rotates for 3.75 seconds??

I know you convert the diam which comes to 0.05 m for RADIUS
But don't know which formula to use tho??

THANKS for your help
Joanne

2. Originally Posted by bradycat
Hello,
Need help on how to set this up and the answer, so I can study it to understand it.

A shaft whose diameter is 10 cm rotates with an angular speed of 1.00 rad / second. Calculate the angular displacement IN RADIANS, if the shaft rotates for 3.75 seconds??

I know you convert the diam which comes to 0.05 m for RADIUS
But don't know which formula to use tho??

THANKS for your help
Joanne
since the shaft has no angular acceleration ...

$\Delta \theta = \omega t
$

the radius length is inconsequential in this problem.