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If a source is moving away from a stationary observer with half of velocity of soun The frequency observed will be :-
one-third
doubled
halved
two-third
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A molecule of mass m moving with a velocity v makes 5 elastic collisions with a wall of the container per secon The change in its momentum per second will be______
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A person, with outstretched arms, is spinning on a rotating stool. He suddenly brings his arms down to his sides. Which of the following is true about system kinetic energy K and angular momentum L ?
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