Question

A ball of mass 50 g tied to the end of a 50 cm inextensible string is whirled around in a vertical circle. Find the tension
in the string when the ball is at the top of the circle. Take g=10m/s2

Answer 1

Question

A ball of mass $50\mathrm{g}$ tied to the end of a $50~\mathrm{cm}$ inextensible string is whirled around in a vertical circle. Find the tension in the string when the ball is at the top of the circle. Take $\mathrm{g} = 10\mathrm{m / s^2}$.

Solution

$$m = 50g = 0.05kg; \quad l = 50~cm = 0.5m; \quad g = 10m/s^2. \quad T - ?$$

Second Newton's law:

$$0 = mg - T;$$ $$T = mg = 0.05 * 10 = 0.5N.$$

Answer

$$T = 0.5N.$$

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