Astone is tied to a string and whirled around in a circle at a constant speed. is the string more likely to break when the circle is horizontal or when it is vertical?

The string is more likely to break when the circle is vertical

Explanation:

The string is more likely to break when the circle is vertical because tension in the string is the same throughout the circular motion and it is equal to mrw^2 when it is rotated in the horizontal plane while tension in the string is maximum and is given by mrw^2+mg when in the vertical plane.

d) the number of neutrons plus the number of protons