If john glenn weighed 640n on earths surface i how much, Ask an Expert

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Q. On an air track, a cart oscillates between the 12 cm mark and the 78 cm mark, completing 11 oscillations in 2 minutes. Find the (1) frequency, (2) period, (3) amplitude, (4) maximum speed and (5) maximum acceleration of the cart.

Q. If John Glenn weighed 640N on Earth's surface, i) how much would he have weighed if his Mercury spacecraft had (hypothetically) remained at twice distance from the center of the Earth? ii) Why is it said that an astronaut is never truly weightless?

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