Aball is attached to a vertical rod by two strings of equal strength (able to support much more than one of these balls) and equal length. the strings are light and do not stretch. the rod begins to rotate with its rotational speed increasing slowly, causing the ball to revolve with slowly increasing speed. which string breaks first? a. the bottom string breaks first. b. the top string breaks first. c. the strings break at the same time.

b Top string breaks first .

Explanation:

The correct answer is

b Top string breaks first .

Centrifugal force acts equally on both sides .The top string has the gravity force acting on it , in addition to the centrifugal force(Tension in the string at top position is maximum) . So more likely to break is the top string .

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach

one "light year" is the distance that light travels, through vacuum, in one julian year.   that's 365.25 days, of 24 hours each.