Harmonics
a. are components of a complex waveform
b. have frequencies that are integer multiples of the frequency of the complex waveform
c. are pure tones
d. have sinusoidal waveforms
e. all of the above
E
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A steel cable spanning a river is 200.000 m long when the temperature is 20.°C. What will be its length when the temperature drops to 0°C? (The coefficient of thermal expansion of steel is 12. × 10-6K-1.)
What will be an ideal response?
The inability to observe parallax of stars contributed to the ancient Greek astronomers' rejection of the idea that Earth revolves around the Sun.
Answer the following statement true (T) or false (F)
The chemical abundance of population I stars
a. indicates that they were formed before the population II stars. b. indicates that the material they formed from had been enriched with material from supernovae. c. indicates that they contain very few heavy metals compared to halo stars. d. depends on the temperature of the star. e. depends on the mass of the star.
At a carnival game, two balls, identical in mass and radius, are made of steel and of rubber. They are offered as a means of knocking over a bowling pin by throwing them at the pin. If they are thrown with the same speed and hit the same spot on the bowling pin, which is more likely to knock the pin over?
A. The steel ball B. Without knowing more information this cannot be answered. C. The clay ball D. Both are equally likely since they have the same momentum