This is the problem:(adsbygoogle = window.adsbygoogle || []).push({});

During a certain period of time, the angular position of a swinging door is described by θ = 4.92 + 10.7t + 1.91t2, where θ is in radians and t is in seconds. Determine the angular position, angular speed, and angular acceleration of the door at the following times.

then I'm given for part a) t=0s and part b) is t=3.07s

I know I have to use the equation for angular position s=r[tex]\theta[/tex] then derive that once for angular velocity ([tex]\omega[/tex]) then take the second derivative for angular acceleration ([tex]\alpha[/tex]). I just don't understand what the values for s and r are and where the come from within this problem. i have that [tex]\theta[/tex](0)=4.92 or .0859rad

any help or guidance is much appreciated.

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Angular Position

**Physics Forums | Science Articles, Homework Help, Discussion**