I asked my buddy this question the other day. Couldn't believe just how IDIOTIC his response was!!!
The weight of the suspended mass (M) provides the central force that maintains the circular motion of the puck.
Centripetal force = mv²/r where m = mass of puck and r the radius of motion, v is the tangential speed.
Mg = mv²/r
Magnitude of force = Mg = 1.9 X 9.81 = 18.64 N
(b) mv²/r = 18.64
v² = 18.64r/m
= (18.64 X 1.1) / 0.028
= 732.29
v = √732.91
= 27.1
Linear speed of puck is 27.1 m/s.
Well he guessed 24.5!!!!!
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