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Exam 1 practice problems solutions

# Exam 1 practice problems solutions - Exam#1 practice...

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Exam #1 practice problems solutions Physics 203 1. You are standing next to the Physics Lecture Hall. Your friend has climbed up unto the roof and is sitting 6.00 m above you with his legs dangling over the edge. His cell phone starts ringing (he left it with you before he climbed up). You toss him his cell but you toss it way too hard. It goes straight up passing your friend and reaches its apex (highest point) a full 3.00 m above his head. He catches it on the way down and answers the phone. It’s his mother, checking to make sure he’s not doing anything he shouldn’t be. a. Draw position, velocity, and acceleration graphs for the phone for the time interval that it was in flight. b. Predict how fast you tossed the phone (meaning, how fast it was traveling right after it left your hand). c. Predict how long the phone was in flight. d. What assumptions, if any, did you make in parts a c.? I’ll choose the origin of coordinates to be the position of the phone just as it leaves your hand, with the positive direction upward. This moment will also be the origin in time. To predict how fast I tossed the phone I’ll use the equation of kinematics that doesn’t involve time. The initial moment will be just as the phone leaves your hand and the final moment will be just as it reaches its apex. 2 2 2 2 2 2 0 2 9.8 9.00 0 13.3 f i f i i f f i v v a x x v v a x x m s m m s 0.5 1 1.5 2 t s 2 4 6 8 x m 0.5 1 1.5 2 t s -5 5 10 v m s 0.5 1 1.5 2 t s -20 -15 -10 -5 a m s 2

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