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course phy 201
9/19 2:30 am
If the velocity of the object changes from 3 cm / sec to 13 cm / sec in 7 seconds, then at what average rate is the velocity changing?-Difference in velocity: 10 cm/s. time passed: 7 seconds. Average acceleration: 1.43 cm/s^2
A ball rolling from rest down a constant incline requires 4.6 seconds to roll the 54 centimeter length of the incline.
• What is its average velocity?
An object which accelerates uniformly from rest will attain a final velocity which is double its average velocity.
• What therefore is the final velocity of this ball?
• What average rate is the velocity of the ball therefore changing?
- Change in time: 4.6 seconds; change in position: 54 centimeters; Average velocity: 11.74 cm/s; Final velocity: 23.48 cm/s;
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Good so far but you haven't figured out the average rate at which the velocity of the ball is changing with respect to clock time.
The problem didn't explicitly say 'with respect to clock time', but that is implicitly understood when the only possible dependent variable is clock time.
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An automobile accelerates uniformly down a constant incline, starting from rest. It requires 14 seconds to cover a distance of 106 meters. At what average rate is the velocity of the automobile therefore changing?
-average velocity: 7.57; starting velocity: 0; final velocity: 15.14; change in velocity: 15.14; average acceleration = 15.14/14 = 1.08 m/s^2
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You got this one.
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Very good. You clearly could have gotten that last part of the first series of questions, since you got everything on the second question, so no revision is needed. However be sure to see my note.
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