Physics I – Exam 1 – Fall 2002
Physics I – Exam 1 – Fall 2006
Answer Key
Part A – 1: C, 2: D, 3: G, 4: C, 5: A, 6: A 4 pts each.
Give credit for 6 if it agrees with 5 even if 5 is wrong.
B-1 20 Points
The key to this problem is the Impulse-Momentum Theorem and also Newton’s Second Law in the form of Equation 11. There are 3 sections to the curve (or two counting the upward and downward part on the right as one), each a section of a parabola.
Looking For
curves are sections of parabolas.
maximum at t = 4 sec.
maximum value = 2 kg m/s.
value at t = 2 sec is half the maximum value (whatever it was).
symmetric curve around t = 4 sec for the interval (2,6) seconds.
[pic]
B-2 24 Points
This problem is an application of conservation of momentum, equations 44x and 44y.
The total momentum in the X direction is +1.2 kg m/s and in the Y direction is 0.
Looking For
trying to use conservation of momentum in some form, right or wrong.
using conservation of momentum separately in X and Y directions.
VBx flat where VAx is flat and a sloped line where VAx is a sloped line.
VBx final value = 3 m/s.
VBy flat where VAy is flat and a sloped line where VAy is a sloped line.
VBy final value = –1 m/s.
Part C
Must show work to receive credit.
C-1 32 points
Step 1: X and Y components of initial velocity: [pic]
[pic]
Step 2: Find time to reach impact point using X equation (no acceleration):
[pic] seconds after the target drops.
Step 3: Find Y posiitons of target and cannonball at the time of impact:
[pic]
[pic]
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[pic]
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