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  • A steel block of 10 kg rests on a horizontal floor as shown. When three iron cylinders are placed on it as shown, the block and cylinders go down with an acceleration 0.2 m/s2. The normal reaction R' by the floor if mass of the iron cylinde

A steel block of 10 kg rests on a horizontal floor as shown. When three iron cylinders are placed on it as shown, the block and cylinders go down with an acceleration 0.2 m/s2. The normal reaction R' by the floor if mass of the iron cylinders are equal and
of 20 kg each, is ______ N. \left [ \text{Take g= 10 m/s}^{2}\text{and}\; \mu _{s}= 0.2 \right ]
 
Option: 1 716
Option: 2 686
Option: 3 714  
Option: 4 684

Answers (1)

best_answer

\begin{gathered} {\left[m g+\left(m_{1}+m_{2}+m_{3}\right) g-R\right]=\left[m+m_{1}+m_{2}+m_{3}\right] a} \\ 700-R=70 \times 0.2 \\ 700-R=14 \\ R=686 \mathrm{~N} \end{gathered}

The correct option in (2).

Posted by

vishal kumar

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