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211 (S07) Final Exam - MC alt

# 211 (S07) Final Exam - MC alt - Multiple Choice15Questions...

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Multiple Choice –  15 Questions                   x 3pts =                  Please write your answers in the space provided. # correct score 1) A rock is thrown downward from an unknown height above the ground with an initial speed of 10 m/s. It strikes the ground 3.0 s later. Determine the initial height of the rock above the ground. (Use g 10 m/s 2 .) A. 30 m B. 45 m C. 60 m D. 75 m 2) If y = 0.02 sin (30 x – 400 t ) (SI units), the velocity of the wave is A. 3/40 m/s B. 40/3 m/s C. 60 π /400 m/s D. 400/60 π m/s E. 400 m/s 3) A stunt pilot weighing 700 N performs a vertical circular dive of radius 800 m. At the bottom of the dive, the pilot has a speed of 200 m/s which at that instant is not changing. What force does the plane exert on the pilot? (Use g 10 m/s 2 .) A. 700 N up B. 2800 N up C. 3500 N up D. 4200 N up E. 4900 N up 4) A magnet is “stuck” to the metal door of a refrigerator. Which of the following forces actually keeps the magnet from sliding to the floor? A. the horizontal magnetic force by the magnet on the door. B. the horizontal magnetic force by the door on the magnet. C. the vertical gravitational force by the earth on the magnet

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211 (S07) Final Exam - MC alt - Multiple Choice15Questions...

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