A 200-lb block is sliding along a horizontal plane at 4 ft/s when a force P is applied on it as shown. The magnitude of P varies according to the relation P = 200t Ib where t is in sec. Fir velocity of the block 2 sec after P is applied. Neglect friction. Use Impulse-Momentum Method and draw the momenta and impulse vectors.

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Atomic diffusion in solids

In material science, diffusion can take place in solid, liquid, and gases. In solids, atomic diffusion can take place with the help of thermally activated and randomly vibrating atoms. The atomic diffusion in solids is complex and very slow in comparison to atomic diffusion in liquids and gases because the interatomic distance between the atoms is smaller in solids as compared to liquids and gases.