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BITSAT 2017

Exam: BITSAT
Year: 2017
Subject: Physics
Chapter: Laws of Motion

BITSAT 2017 · Physics · Laws of Motion

Two blocks A and B are placed one over the other on a smooth...

Two blocks $A$ and $B$ are placed one over the other on a smooth horizontal surface. The maximum horizontal force that can be applied on lower block $A$ , so that $A$ and $B$ move without separation is $49N$ . The coefficient of friction between $A$ and $B$ is

Two blocks A and B are placed one over the other on a smooth horizontal surface. The maximum horizontal force that can

Options

A $0. 2$
B $0. 3$
C $0. 5$
D $0. 8$

Correct answer

C. $0. 5$

Step-by-step solution

Equation of motion of lower block is

$F = \mu\left({M}_{A} + {M}_{B}\right) \cdot g$

$\mu = \dfrac{F}{\left({M}_{A} + {M}_{B}\right)g}$

$= \dfrac{49}{10 \times 9. 8} = \dfrac{1}{2} = 0. 5$

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