HW for tonight: Read p. 8-14, do PROBLEMS (not questions) 15, 17, 20, 26, 33.
Solutions:
15. You should do this for your own height, but Mr. Weinberg is 5'7", or 67 inches. This works out to 1.702 meters.
17.
a) 3.9 x 10-9 inches
b) Conversion factor is that 1 atom = 1.0 x 10-10 meters. You then use the 1 cm length given to find how many atoms there are. Answer: 108 atoms.
20. 7.3% longer
26. There are many correct answers! Here's a reasonable way to go about it.
Say your heart beats 64 beats per minute, and that the average time a person lives is around 75 years. 64 beats/min * (60 min/hr)*(24 hr/ 1 day) * (365 days/year)*(75 years/lifetime) = 2.523 x 109 beats per lifetime.
33.
a) 31,536,000 seconds/year
b) 3.154 x 1016 nanoseconds
c) 3.171 x 10-8 years
WP1. units of A: m/s4
Subscribe to:
Post Comments (Atom)
1 comment:
for the wp1... the exponent for the seconds is incorrect
just saw it while i was reading it
Post a Comment