Aliasing HW

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Hey /sci/

I'm having trouble with my homework and hoped you could help. I just learned about aliasing yesterday and not sure how to go about this solving these problems. any assistance would be greatly appreciated

Compute the temporal sampling rate (samples/second) needed to make an 8-spoked wheel appear stationary if it were rotating at 80 revolutions/minute

Determine a second temporal sampling rate for the above example that would accomplish the same result. What is a general rule we can extract about predicting the temporal sampling rates that would result in perceiving a rotating wheel as standing still?

Compute the temporal sampling rate needed to make a 5-spoked wheel appear to move backwards at 3 revolutions/minute when it is actually rotating forwards at 100 revolutions/minute.