|QUIZ 1(ANSWERS)-Problems below correspond to
|CH. 1 - DISCUSSION QUESTIONS 1, 4, 7
|CH 1 - EXERCISES/PROBLEMS: 10; 11; 15; 13; 56; 26; 27.
|CH. 4 - DISCUSSION QUESTIONS 1, 2, 5, 6
|CH. 4 - EXERCISES/PROBLEMS: 1, 3, 4, 6
|CH. 1 - DISC QUESTIONS: 1, 4, 7
|1. Remember, for every scientific
hypothesis there exists an experiment such that a
"negative" result disproves it. If you don't find what
you're looking for-a "negative" result-you'd say with
confidence the hypothesis is wrong. "There exists
Extra-terrestrial humanoid life in the Universe" is not
a scientific hypothesis. If you don't find
Extra-terrestrials, it doesn't mean they don't exist-your
range of investigation could never be sufficiently large.
But as ridiculous as it sounds, " The Moon is made of
cheese" is a scientific claim assuming there
exists means to examine the Moon in sufficient detail. No
such test exists for Extra-terrestrials.
|THOUGHT PROBLEM: WHAT IS THE TANGENT FOR FOLLOWING RUN AND
RISE VALUES? Compute rise/run, rise = 120 m, run = 1 kilometer.
|4. added mass = (rise/run)*time. Think about why the mass
|7. For 3.14159...., , the number of radians in a
half-circle, what are the two lengths? Think about #2
and other dimensionless ratios.
|CH 1 - EXS/PROBS: 10; 11; 15; 13; 56; 26; 27. NOTE: FOR #10,
SEE SEC 1.4 EXAMPLES.
|11.mass = density* sphere volume w/ required
|15. Find x1 = number of seconds in 365.24 d with 5 sig. figs. Compute |x1 - x2|*100%/x1, where x2 = pi*107
and pi = 3.14159..... and % is short hand for
division. Use sig. fig. rules for
subtraction/addition, multiplication and division. Visit: http://library.thinkquest.org/10796/ch1/ch1.htm
|13;;;; 890 km = 890,000 m with 2 sig. figs, precise to the
10,000's place (in m) or 10's place (in km), a large number
with low precision. Now 10 m is precise to the 10's place.
You'd write 890 km = 890,000 m and 10
m = 0.01 km. Thus, 890 km + 0.01
km = 890.01 km = 890 km. For the given precisions, adding
10 m has no effect after rounding. PE = |x1 -
x2|/x1*100%, where x1 = 890.01 km and x2 = 890 km
and % is short hand for division. The difference is zero after rounding. See http://library.thinkquest.org/10796/ch1/ch1.htm
|52;;;. Period = 1/frequency; # cycles = frequency*time.
|26;;;. Done in class lecture notes in some
|27;;;. See section 1.8. There are three displacements. With respect
to page, the first is vertical, the second horizontal
and the third lies 45 degrees above horizontal with magnitude 3.1
km. Find Dx and Dx, x and y
components of total displacement vector-D.
Clearly Dx = 4.0 + the x-component of third
displacement and Dy = 2.6 + y-component of third
displacement. Find vector-D magnitude using the
Pythagorean Th. Tan theta = Dx|/|Dy| where theta is related
angle. In what quadrant does vector -D point?