An object moves in a circle at constant speed. Its tangential acceleration

a. points in the direction of the object's velocity at each instant in time.
b. points in the direction opposite the object's velocity at each instant in time.
c. is always zero.
d. points towards the center of the circle at each instant in time.

c. is always zero

Explanation:

since the speed on circular path is uniform , there is no tangential acceleration . But the radial acceleration which is also called centripetal acceleration, is not zero . It is equal to

v² / R where v is velocity on circular path and R is radius of circular path.

So option c is correct .

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this