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 --  

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

3. dark matter

empty space could also be a simple vacuum