With what minimum acceleration can a fireman slides down a rope while k breaking strength of the rope is 2 3 his weight Options: A . &nbsp23g B . &nbspg C . &nbsp13g D . &nbspZero

With what minimum acceleration can a fireman slides down a rope while k breaking

Question

With what minimum acceleration can a fireman slides down a rope while k breaking strength of the rope is

\frac{2}{3}

his weight

Options:

A . 23g

B . g

C . 13g

D . Zero

Answer: Option C
:
C
When fireman slides down, Tension in the rope T = m(g – a)
For critical condition

m (g - a) = \frac{2}{3} m g \Rightarrow m g - m a = \frac{2}{3} m g ∴ a = \frac{g}{3}

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