A tuning fork has a frequency of 400 Hz and hence a period of 2.50 × 10^-3 s. If the tuning fork is in an inertial frame of reference moving by the observer at speed of 0.680c, what is the frequency of the fork as measured by the observer? (Assume that measurements are strictly by optical means and that the speed of sound waves in air is not pertinent here.)
a. 454 Hz
c. 605 Hz
b. 293 Hz
d. 265 Hz
B
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Pure water is classified as
A. an insulator. B. a conductor. C. a semiconductor. D. all of these choices are correct E. none of these choices are correct
An object of mass m is hanging by a string from the roof of an elevator. The elevator is moving up at a constant speed. What is the tension in the string?
A. greater than mg B. less than mg C. equal to mg D. depends on the speed of the elevator
The critical temperature for nucleosynthesis to begin was the:
A) triple alpha reaction at 100 million K. B) deuterium bottleneck at about 900 million K. C) proton-proton cycle at 10 million K. D) iron production at 10 billion K. E) formation of lithium at 50 million K.
Briefly describe the modern theory of how our Moon formed
What will be an ideal response?