Homework Assignment 3 Solutions
Problem 2.33: Air-bag injuries.
During an auto accident, the vehicle's air bags deploy and slow down the passengers more gently than if they had hit the windshield or steering wheel. According to safety standards, the bags
Homework Assignment 2 Solutions
Displacement vs. Time Graphs
The motions described in each of the questions take place at an intersection on a two-lane road with a stop sign in each direction. For each motion, select the correct position versus time graph
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Problem 1) a) F=ma and the force supplied by both engines is the same. Therefore car b will have a greater acceleration and hence greater velocity 1 m into the race. b) We know work is change in kinetic energy. Also, W=force*distance. The same amount of w
Problem 7.2 In the rough area, the block decelerates and travels a distance s. We can use the equation vf2= vi2+2ax. When x =s, vf=0. We can solve for acceleration: a=-vi2/2s. We want to find the distance traveled when vf= vi/3. Using vf2= vi2+2ax, we get
Problem 1) a) W=| F| | s| cos() and =90 so W=0 b) 0<90 and so cos()>0 so that W>0 c) Here =-180 so W<0 d) =0 so W>0 e) W< 0 f) =-90 so W=0 g) cos()>0 for 0> -90 h) a. | s|=160m , | F| =18N, =0 so W=2900J b. | F| =30N, =30 so W=4200J c. | F| =12N, =-180 so
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Physics 6A Practice Final Problems
1) A locomotive engine of mass M is attached to 5 train cars, each of mass M. The engine produces a constant force that moves the train forward at acceleration a. If 3 of the cars are removed, what will be the accelerati
Physics 6A
Practice Final (Fall 2009) solutions
Prepared by Vince Zaccone For Campus Learning Assistance Services at UCSB
1. A locomotive engine of mass M is attached to 5 train cars, each of mass M. The engine produces a constant force that moves the tra
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