As a 4-10 solar mass star leaves the main sequence on its way to becoming a red supergiant, its luminosity:
A) decreases.
B) first decreases, then increases.
C) increases.
D) remains roughly constant.
E) first increases, then decreases.
D
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Answer the following statement true (T) or false (F)
According to the nuclear energy curve, would fusion or fission or neither release nuclear energy from carbon [atomic number 6], and why?
A) Neither, because all other elements have higher nuclear energies. B) Fission, because then the reaction products have lower atomic numbers and a higher nuclear energy. C) Fission, because then the reaction products have higher atomic numbers and a lower nuclear energy. D) Fusion, because then the reaction product has a higher atomic number and a lower nuclear energy. E) Fusion, because then the reaction product has a lower atomic number and a higher nuclear energy.
An automobile engine operates with an overall efficiency of 12%. How much energy is delivered as waste heat (in gallons of gasoline) for each 10 gallons of fuel burned?
a. 1.2 b. 8.8 c. 6.5 d. 4.7 e. 7.5
The universal gravitational constant G was first measured
A) before Newton's time. B) by Newton himself. C) after Newton's time.