5. A boy swings a brick (mass 3kg) around his head in a circular motion with a radius of 4 metres on a piece of string whose breaking strength is 300N. How fast should he swing the brick (in rpm) just before the string breaks?
Added by Victor Manuel E.
Step 1
This can be found using the formula for centripetal force: \[ F = \frac{mv^2}{r} \] where F = tension force in the string m = mass of the brick (3kg) v = velocity of the brick r = radius of the circular motion (4m) Show more…
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