course Phy201
What does the major quiz cover up to i need to take it by the end of the week and wonder how many assigments i need to finish before i will be ready to take the first major quiz
The Major Quiz is assigned on the Assignments page around Assignment 9 or 10, I believe. Check the Assignments page. I would confirm the details for you but I can't access the College's pages this evening, probably related to storms.
An automobile traveling a straight line is at point A at clock time t = 4 sec, where it is traveling at 10 m/s, to point B at clock time t = 11 sec, where it is traveling at 20.5 m/s. Point A is 75 meters from the starting point and point B is 115 meters from the starting point. What are the average velocity and the average acceleration of the automobile during the specified time? What evidence is there that the acceleration is or is not uniform?
Vavg=Total distance/total time Based on this you take Vavg=(115m-75m)/11s-4s=5.714m/s now to find acceleration=‘dv/’dt so you take (20.5m/s-10m/sec)/11s-4s=1.5m/s/s for the acceleration. The evidence to determine if this is uniform is take the Vavg 5.71m/s multiply it by 2 then add it to the starting velocity. This gives you a number of 21.428 which should equal the final velocity but it is very close so I would assume it is not uniform since it does not equal the final velocity.
Very good, except that your test for uniformity of velocity isn't correct. Close, but the final velocity would be double the average, minus the initial velocity.
The basic idea is that if the v vs. t graph is linear, then the average velocity will be equal to the average of initial and final velocities. Not so here (ave of init and final is around 15 m/s) so accel isn't uniform.