Four resistors are connected in parallel: the resistance values are 4-ohms, 8-ohms,12-ohms, and 16-ohms: they are connected across a 120-volt DC supply: Find the total circuit resistance.
Answer:
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The triple alpha process
a. controls the pulsations in Cepheid variable stars. b. is the nuclear fusion of hydrogen to helium in massive stars. c. is the process that produces the neutrinos we receive from the sun. d. requires a temperature of about 5,000,000 K to operate e. occurs during helium flash.
An atom of sodium has an atomic number of 11 and a mass of 23 . How many neutrons does it have?
a. 11 b. 12 c. 23 d. 34 e. 35
What is the primary purpose of an astronomical telescope?
A) to magnify and make distant objects appear closer B) to separate light into its component colors C) to measure the intensity of light very accurately D) to access wavelengths that we cannot see visually E) to collect a lot of light and bring it to a focus
Suppose a 70. kg student were to become (be compressed into) a black hole
(a) What would be his/her Schwarzshild radius ("size" of the B.H.)? (b) How does this compare to the size of a proton?