The pilot of an aircraft flies due north relative to the ground in a wind blowing 40 km/h toward the east. If his speed relative to the ground is 80 km/h, what is the speed of his airplane relative to the air?
A. 89 km/h
B. 85 km/h
C. 81 km/h
D. 76 km/h
E. 72 km/h
Answer: A
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Equal masses of hydrogen and helium gas are at the same temperature in vessels of equal volume. The atomic mass of helium is four times that of hydrogen. If the total mass of both gases is the same, the ratio of the pressure of helium (He) to that of hydrogen (H2) is
A.
.B.
.C.
D.
E.
Contrasting a M3Ib and M3V star, they differ primarily in ________ and ________
Fill in the blank(s) with correct word
Which of the following statements about the main sequence stage in the life of a star is FALSE?
a) main sequence stars are rare in the Galaxy, so we are lucky to be living around one b) different stars spend a different amounts of time (number of years) in the main sequence stage, depending on the characteristics they were born with c) during the main sequence stage, the mass of any star does not change significantly d) during the main sequence stage, energy to power the star is provided by the fusion of hydrogen e) all stars spend the majority of their lives in the main sequence stage
For an atom of hydrogen where the quantum number n = 3, how many possible independent configurations of the atom exist (consider principal quantum number n, angular momentum quantum number l, magnetic quantum number ml, and magnetic spin quantum number ms)?