The most common stars are
a. supergiants.
b. giants.
c. upper (more luminous) main-sequence stars.
d. white dwarfs.
e. lower (less luminous) main-sequence stars.
e
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Some stars vary in brightness. What observing technique is best for observing the details of the changes in brightness?
A) Time-monitoring because we want to track how the brightness changes with time. B) Imaging because an image will show the star getting brighter and dimmer. C) Spectroscopy because changing brightness means changing temperature. D) All of the above are equally useful in detecting variation in brightness.
Which of the following is suggested as the best explanation of the missing solar neutrinos?
a. The Sun is fusing helium but not hydrogen. b. Nuclear reactions do not produce neutrinos as fast as theory predicts. c. The Sun may contain matter we haven't yet identified. d. Neutrinos may oscillate between three different flavors. e. None of the others.
The relative humidity is 100% at the ______________ temperature
Fill in the blank(s) with correct word
A 20-N horizontal force pushes an object along a rough floor so that the object moves with a constant velocity of 6.0 m/s. How much power does this force deliver to the object?
A) 5.0 W B) 20 W C) 160 W D) 0 W E) 120 W