The primordial nucleosynthesis was sped up by the abundance of ________ in the universe once the temperature dropped below a billion K
A) helium-3 B) hydrogen C) deuterium D) tritium E) helium
C
Physics & Space Science
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A 30.0-kg object experiences a drag force due to air resistance with a magnitude proportional to the square of its speed. The object falls with an acceleration of 4.00 m/s2 downward when it is falling downward at 70.0 m/s. What is its terminal speed?
A) 110 m/s B) 157 m/s C) 91.0 m/s D) 172 m/s E) 108 m/s
Physics & Space Science
The most harmful radiations are those that
A) kill living cells. B) damage living cells. C) don't encounter cells.
Physics & Space Science
What is the energy needed to change an He+ ion into an He++ ion? (The ionization energy of hydrogen is 13.6 eV)
a. 13.6 eV b. 54.4 eV c. 92.9 eV d. 112.4 eV
Physics & Space Science
The principal greenhouse gases are ______________ and ______________
Fill in the blank(s) with correct word
Physics & Space Science