Questions
Consider a large block placed on a smooth horizontal surface, with a man standing at one end of the block. The man walks to the other end, relative to the block. The distances (absolute) moved by the man and the block are:
detailed solution
Correct option is A
Let m and M be the respective masses of the person and the block, and let l be its length. Now, if x1 and x2 be the absolute displacement of the person and the block and x that of the centre of mass, then x = mx1+mx2m+M ⇒∆x = m∆x1+m∆x2m+M Since horizontal forces are absent, so ∆x = 0m∆x1+M∆x2 = 0 ⇒ m(-l)+(m+M)∆x2 = 0∆x2 = mlm+MSimilarly, ∆x1 = Mlm+MSimilar Questions
Figures I, II, III and IV depict variation of force with time. Select the figure(s) that depicts minimum impulse delivered.
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