Aparticle on a string is whirled in a circle at a constant speed, in the absence of a gravitational field. a top view of the circular motion at one instant is

This is an incomplete question. The diagram and a part of the question is missing.

Explanation:

In the context, it is given that the particle tight to a string is whirled in a circular direction in a constant speed. And there is no gravitational field.

Now since the particle's speed is constant, hence the tangential acceleration is zero. The particle exhibits radial acceleration only which will act along the radius towards the center of the circle (towards the left).

Therefore the correct representation of the component of the acceleration is given below --  

the tires are rotating at 0.434 rpmlinear speed=45 m/sdiameter=0.550 mradius=0.275 mnow v= rωω= v/rω=45/0.275ω=163.6 rad/sω=163.6 rad/s (1rev/2π rad) (60s/1m)ω=1563 rpm