# prelim1_2009 - Your name _ Multiple Choice Questions 1-5:...

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Your name ________________________ 2 Multiple Choice Questions 1-5: Circle the correct answer. Question 1 (5 points) An object's position as a function of time is shown above. Indicate (by circling) all labeled time(s) at which the following are true: v x > 0: t 1 t 2 t 3 t 4 t 5 v x = 0: t 1 t 2 t 3 t 4 t 5 a x > 0: t 1 t 2 t 3 t 4 t 5 speed increasing: t 1 t 2 t 3 t 4 t 5 Question 2 (5 points) While driving in a car at 30 m/s you see a trash can 10 m to the right of the road. When you are directly opposite the can you throw an apple core straight at the can. The core's intial horizontal speed -- relative to the car -- is 20 m/s. The core lands 0.50 s later. Where does it land relative to the trash can , in unit vector notation? (The coordinate system is defined relative to the trash can as shown. i is the unit vector along x, and j is the unit vector along y.) r = (A) 10 i (B) 10 i + 30 j (C) 15 j (D) 10 i +15 j (E) 30 j (meters) x t t 1 0 0 t 2 t 3 t 4 t 5 trash can x y 10 m 30 m/s car

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3 Question 3 (5 points) Two people are attempting to break a rope, which will break if the tension in the rope exceeds 500 N. If each person can pull with a force of 300 N, they can break the rope together if: (A) They take opposite ends of the rope (one person on each end) and pull. (B) They tie one end of the rope to a wall and both pull on the other end. (C) Both (A) and (B) will work. (D) They cannot break the rope. Question 4 (5 points) Two books of mass m 1 =m and m 2 =2m are accelerated upward by a force F applied from below, as shown in (a). How does the magnitude of the force that book 2 exerts on book 1 change if the books are stacked as in (b)? F
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## This note was uploaded on 10/27/2010 for the course PHYS 2207 at Cornell University (Engineering School).

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prelim1_2009 - Your name _ Multiple Choice Questions 1-5:...

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