Physics Study Guide Answers

It took me about 35 minutes to do, so I expect the exam to take almost the entire class period.
1) 1kg m/s^2
2) 1kg m^2/s^2
4) 1580250 J = 1600000 J
5) 35.5555... m/s = 36 m/s
6) 177437.5 J = 180000 J
7) Buck: 1458 = 1460 kg m/s (should probably be negative)
Car: 41923.2 = 41900 kg m/s (should be negative if the buck is positive since the velocities are in opposite directions)
8) vfinal = 23.48..., so you slow down by 2.9 m/s (your final velocity is 3 sig figs (23.5), so when you subtract them, you keep the least precise place, the tenths place, so 2.9 only has 2 sig figs, but is still correct)
Other 4) 44.1 N
Other 5) .160714 = .161
Other 6) 1.35692 = 1.36 m/s^2
Other 7) Net force = 20.6375, Force of Friction = 23.4625 in the other direction. Coefficient of static friction = .0855047 = .0855
Other 8) 6612.245 = 6610 m
9) 73.4694 = 73.5 s
10)  .46291... = 0.463 s
11) .75917... = .759 m 
Bonus) 4.82386 = 4.82 m/s at 70.1 degrees (70.12453...) below the horizontal


Good Luck! I'll give a food reward if anyone finds a mistake I made.  Maybe a bonus point depending on how disastrous the mistake is.

Science 8 Exam Review

Eighth Grade Science Exam Review
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