19. How is the period of a pendulum affected when its point of suspension is (a) moved horizontally in the plane of oscilla- tion with acceleration a; (b) moved vertically upward with ac- celeration a; (c) moved vertically downward with acceleration a g? Which case, if any, applies to a pendulum mounted on a cart rolling down an inclined plane?
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Answer: When the point of suspension of a pendulum is moved horizontally, its period remains unchanged.
ANS: A
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