Semiconductor's concept in brief for learning and revision purposes for class 12 and JEE/NEET/BITSAT etc. examinations.
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Ques: A block of mass 1 kg is pushed against a rough vertical wall with a force of 20 N. coefficient of static friction being 1/4. Another horizontal force of 10 N is applied on the block in a direction parallel to the wall. Will the block move? If yes, with what acceleration? If no, find the frictional force exerted by the wall on the block. (g=10 m/s2).
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https://www.youtube.com/watch?v=FoxbRlEP5sk
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Solution of Question of Exercise from topic, "Centre of Mass, Linear momentum, Collision" of Book, Concepts of Physics by H. C. Verma.
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Ques: Two balls having masses m and 2m are fastened to two light strings of same length l (figure 9-E18). The other ends of the strings are fixed at O. The strings are kept in the same horizontal line and the system is released from rest. The collision between the balls is elastic. (a) Find the velocities of the balls just after their collision. (b) How high will the balls rise after the collision ?
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https://www.youtube.com/watch?v=YDCEm5dv7pc
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https://www.youtube.com/watch?v=khDFgQwenSU