# HW_8 - P112 Spring 2007 Homework #8 Due: Friday March 16th,...

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P112 Spring 2007 Homework #8 Due: Friday March 16th, 2007 – At lecture Reading: 6.5, 7.2-7.5, 8.1-8.3 Not all concepts will be covered in class – you are responsible for all material in the reading and in the homework problems. Warm-up Exercises: (Answer only will be marked) 1. After a winter storm a 1400-kg car going west on Buffalo Street at 35.0 km/h collides with a 2800-kg truck going south across Buffalo at 50.0 km/h. If they become coupled on collision, what are the magnitude and direction of their velocity after colliding? You can ignore forces between the vehicles and the icy road. 2. Bill is going ice skating for the first time. He has gotten himself into the middle of an ice rink and cannot figure out how to make the skates work. Every motion he makes simply slips on the ice and leaves him in the same place he started. He decides that he can get off the ice by throwing his gloves in the opposite direction. (a) Suppose he has a mass M and his gloves have a mass m. If he throws them as hard as he can away from him, and they leave his hand with a velocity v. Explain whether or not he will move. If he does move, calculate his velocity, V. (b) Discuss his motion from the point of view of the forces acting on him. (c) If the ice rink is 10 m in diameter and the skater starts in the center, estimate how long it will take him to reach the edge, assuming there is no friction at all. Mathematics Exercises: 3 . Let y= ln(x). For which values of x is y>0? For which values is 0<y<1? For which values of x is y<0? Sketch the function.

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## This note was uploaded on 03/27/2008 for the course PHYS 1112 taught by Professor Leclair,a during the Spring '07 term at Cornell University (Engineering School).

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HW_8 - P112 Spring 2007 Homework #8 Due: Friday March 16th,...

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