A pen of mass $m$ is lying on a piece of paper of mass $M$ placed on a rough table. If the coefficients of friction between the pen and paper and the paper and the table are $\mu_1$ and $\mu_2$, respectively. Then, the minimum horizontal force with which the paper has to be pulled for the pen to start slipping is given by
A pen of mass $m$ is lying on a piece of paper of mass $M$ placed on a rough table. If the coefficients of friction between the pen and paper and the paper and the table are $\mu_1$ and $\mu_2$, respectively. Then, the minimum horizontal force with which the paper has to be pulled for the pen to start slipping is given by
- [KVPY 2010]
- A
$(m+M)\left(\mu_1+\mu_2\right) g$
- B
$\left(m \mu_1+M \mu_2\right) g$
- C
$\left(m \mu_1+(m+M) \mu_2\right) g$
- D
$m\left(\mu_1-\mu_2\right) g$
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A $1\,kg$ block is being pushed against a wall by a force $F = 75\,N$ as shown in the Figure. The coefficient of friction is $0.25.$ The magnitude of acceleration of the block is ........ $m/s^2$
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- [JEE MAIN 2014]
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