Questions
A coin is placed at the edge of a horizontal disc rotating about a vertical axis through its axis with a uniform angular speed 2 rad. The radius of the disc is 50 cm. Find the minimum coefficient of friction between disc and coin so that the coin does not slip (g = 10 m).
detailed solution
Correct option is B
f1=μmg,friction will provide the necessary centripetal force f = mw2rf ≤ fl ⇒mw2r ≤μmgμ≥ω2rg=22×50/10010μ≥0.2Talk to our academic expert!
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Two masses of I kg and 5 kg are attached to the ends of a massless string passing over a pulley of negligible weight. The pulley itself is attached to a light spring balance as shown in figure. The masses start moving during this interval; the reading of spring balance will be:
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