# Rotational Kinematics Question Homework Help needed

1. Nov 15, 2006

### rmarkatos

Our sun rotates in a circular orbit about the center of the Milky Way Galaxy. The radius of the orbit is 2.2x10^20 m, and the angular speed of the sun is 1.2x10^-15 rad/s. (a) What is the tangential speed of the sun? (b) How long (in years) does it take for the sun to make one revolution around the center?

(a) for part a all i did was VT=r(w) w=omega

(b) for this part since we know the constant speed is 1.2x10^-15 rad/s and since its one revolution theta should equal 2(pi) radians so am i supposed to use w(omega)= 0(theta)/t(time)

is this correct?

2. Nov 15, 2006

### rmarkatos

thanks for the help everyone.................................