Which of the following point towards the center of the circle in uniform circular motion?

(a) velocity, acceleration.
(b) acceleration.
(c) velocity, net force.
(d) velocity, acceleration, net force.
(e) acceleration, net force.

E) Acceleration, net force

Explanation: In order to explain this problem we have to consirer that the uniform circulat motion has constant angular velocity (ω) and the vector velocity is changed its direction for any point that cover the circle but its modulus is contant and its value is v=ω*R.  In order to ensure these conditions, the net force also the accelaration called centripetal must point to the center of the circular trajectory.

co2reflects heat radiation back to earth buning coal and oil emits co2 globe warms

it is a negative acceleration