For uniform circular motion does the direction of the centripetal force depend on the sense of rotation (i.e., clockwise or anti-clockwise)?

A block moves with uniform circular motion because a cord tied to the block is anchored at the centre of a circle. Is the power of the force exerted on the block by the cord positive, negative or zero?

One often comes across the following kind of statement concerning circular motion. A particle moving uniformly along a circle experiences a force directed towards the centre and an equal and opposite force directed away from the centre. The two forces together keep the particle in equilibrium. Explain, what is wrong with this statement?

What is centripetal acceleration? Find its magnitude and direction in case of circular uniform motion.

A proton enters a uniform magnetic field of intensity 1.5 T in a direction perpendicular to the field. If the K.E. of the proton is (8.5 x 10^-25 J) , find the force acting on it.