Question 29: Laws of Motion

Question

With what minimum acceleration can a fireman slide down a rope while breaking strength of the rope is $$\frac{2}{3}$$ of the weight?

Accepted Answer

If a man slides down with some acceleration, then its apparent weight decreases. For critical condition, rope can bear only $$\frac{2}{3}$$ of his weight. If a is the minimum acceleration, then tension in the rope
$$=m(g-a)=$$ breaking strength
$$\Rightarrow m(g-a)=\frac{2}{3}mg$$
$$\Rightarrow a=g-\frac{2g}{3}=\frac{g}{3}$$

Answer

$$\frac{2}{3}$$ g

Answer

g

Answer

$$\frac{1}{3}$$ g

Answer

zero

Laws of Motion

With what minimum acceleration can a fireman slide down a rope while breaking strength of the rope is $\frac{2}{3}$ of the weight?

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