I stretch a rubber band and "plunk" it to make it vibrate in its fundamental frequency. I then stretch it to twice its length and make it vibrate in the fundamental frequency once again. This rubber band is made so that doubling its length doubles the tension and reduces the mass per unit length by a factor of 2 . The new frequency will be related to the old by a factor of:
a. 4.0.
c. 1.4.
b. 2.0.
d. 1.0.
C
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Find the number of nuclei per unit volume (n = nuclei/cm3) for lead. atomic weight = 202.7 density = 11.5 g/cm3 Avogadro's number = 6.02 × 10^23
a. 2.51 × 10^22 b. 3.42 × 10^22 c. 2.93 × 10^22 d. 2.94 × 10^23 e. 2.05 × 10^21
Which would you expect to be more viscous, a polymer made of long molecular strands or one made of short molecular strands? Why?
A) short molecular strands because of a greater density B) long molecular strands because they tend to tangle among themselves C) short molecular strands because their ends are typically polar D) long molecular strands because of a greater molecular mass
Life forms in the Precambrian included
A) trilobites. B) brachiopods. C) coelacanths. D) cyanobacteria.