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Unformatted text preview: P112 Spring 2008 Homework #2 Reading: 3.13.3, 3.5 Not all concepts will be covered in class – you are responsible for all material in the reading and in the homework problems. Problems: 1. A car with an initial velocity v brakes to a stop with constant deceleration in a time t. If the initial velocity was twice as large but the constant deceleration was half as large, the time to stop would be A. 8t B. 4t C. 2t D. t E. 0.5 t 2 . A car moving with constant acceleration covers the distance between two points 70.0 m apart in 7.00 s. Its speed as it passes the second point is 15.0m/s. What is its speed at the first point, and what is its acceleration? 3. A jet plane is flying at a constant altitude. At time t 1 =0 it has components of velocity v x =90 m/s and v y =110 m/s. At the time t 2 = 30.0 s, the components are v x =170 m/s and v y =40 m/s. a) Sketch the velocity vectors at t 1 and t 2 . How do these vectors differ? For this time interval calculate b) the components of the average acceleration; c) the magnitude and the direction of the average acceleration. 4. A car is traveling at a constant velocity with magnitude v C . At the instant that the car passes a motorcycle officer, the motorcycle accelerates from...
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This homework help was uploaded on 02/15/2008 for the course PHYS 112 taught by Professor Wheeler during the Spring '08 term at Cornell.
 Spring '08
 Wheeler
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