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Q. A person in an elevator is holding a 25 kg block by a cord rated to withstand a tension of 335 N. Starting from rest, the elevator begins to move upwards at a constant acceleration and the cord holding the block breaks. What was the minimum acceleration of the elevator? Assume g = 10 m/s2

Q. A subway train rounds an unbanked curve at 70 . A passenger hanging onto a strap notices that an adjacent unused strap makes an angle of 14 to the vertical. What is the radius of the turn?

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