Suppose that she pushes on the sphere tangent to its surface with a steady force of FFF = 65 NN and that the pressured water provides a frictionless support. How long will it take her to rotate the sphere one time, starting from rest?

Aliquid is an answer i hope this

Bis the

Repeated trials allow you to calculate a mean which can reduce the effect of random errors to make your results more precise.your results will also be reproducible therefore if someone else did the same experiment they'd get the same results which would make your results more reliable.