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Unformatted text preview: Exam II Review Concept Questions 1. An elevator is going up at a constant speed. Near the top floor, it starts to slow to a stop. During the period that it is slowing down, its acceleration is A) downward B) upward. C) in some other direction. Answer: downward (Can you draw the v1 – v2 – ∆ v diagram?) 2. Consider the vectors V 1 and V 2 shown. What is the direction of ∆ V = V 2 V 1 , V 1 + ∆ V = V 2 Answer: B) down 3. Consider the vector Which equation is correct? A) A x = +A cos θ B) A x = –A cos θ C) A x = +A sin θ D) A x = –A sin θ Answer: A x = –A sin θ 4. A projectile is fired at an initial speed of v o at an angle of θ above the horizontal. Which of the following expressions could possibly be the correct expression for the range of the projectile? (Hint) check the units). Answer: C) only this expression has the units of distance 5. A plane in horizontal flight moving at constant velocity drops a heavy package while approaching the border of a kingdom. Which crosses the border first? (As usual, assume that air resistance is negligible.) A) the plane B) the package C) both cross at the same instant Answer: Both cross at the same instant. 6. A boy of mass M = 50 kg pushes on a baby carriage of mass M/5 = 10 kg. The magnitude of the force on the carriage from the boy is F onCarriage . The magnitude of the force on the boy from the carriage handle is F onBoy . How do the magnitudes of the forces compare?...
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 Fall '06
 DUBSON
 Physics, Acceleration, Force, left end

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