Which of the following represent travelling wave? (1) y = A sin (15 t – 2x) (2) y = A cos (15 t) sin 2x (3) y = A sin (15 t) cos 2x (4) y = A e–x cos (15 t – 2x)

Weight at pole is 49 Newton then weight at equator? (1) 48.83 N (2) 49.17 N (3) 49.83 N (4) 49 N

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