The earth orbits the sun once a year (3.16 x 10^7 s) in a nearly circular orbit radius 1.50 x 10^11 m. With respect to the sun, determine the following.

(a) the angular speed of the earth

rad/s

(b) the tangential speed of the earth

m/s

(c) the magnitude and direction of the earth's centripetal acceleration magnitude m/s^2

i don't understand why a kinematic equation does not work for this.