MCQ
Newton's third law of motion can be used to explain:
- AWhy the passengers in a bus tend to fall backward when its starts suddenly
- BSwimming of a man
- CMotion of a rocket
- DBoth (B) and (C)
Explanation:
A man applies a force on water in the backward direction while swimming and according to Newton's third law, the water pushes the man with equal force in the forward direction and thus the man swims forwards.
Similarly, during the motion of a rocket, the gases exhausted in the backward direction gives a finite thrust to the rocket in the forward direction and thus helps it to move forwards.
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An object is put in three liquids having different densities, one by one. The object floats with $\frac{1}{9},\frac{2}{11}$ and $\frac{3}{7}$ parts of its volume outside the surface of liquids of densities d1, d2 and d3 respectively. Which of the following is the correct order of the densities of the three liquids ?