We do not know for certain whether the general trends we observe in stellar birth masses also apply to brown dwarfs. But if they do, then which of the following would be true?
A) Brown dwarfs would be responsible for most of the overall luminosity of our Milky Way Galaxy.
B) Most of the brown dwarfs in the Milky Way Galaxy would be quite young in age.
C) Brown dwarfs would outnumber all ordinary stars.
D) Brown dwarfs would be extremely rare.
C
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Equilibrium: A push of magnitude P acts on a box of weight W as shown in the figure. The push is directed at an angle ? below the horizontal, and the box remains a rest. The box rests on a horizontal surface that has some friction with the box. The friction force on the box due to the floor is equal to
A. P sin ?. B. P cos ?. C. 0. D. P cos ? + W. E. P + W.
Which planet has the most extreme seasons?
A. Jupiter B. Saturn C. Mercury D. Venus E. Uranus
Suppose you know the frequency of a photon and the speed of light. What else can you determine about the photon?
A) its temperature B) the chemical composition of the object that emitted it C) its wavelength and energy D) its acceleration
In a diffraction grating experiment, light of 600 nm wavelength produces a first-order maximum 0.350 mm from the central maximum on a distant screen
A second monochromatic source produces a third-order maximum 0.870 mm from the central maximum when it passes through the same diffraction grating. What is the wavelength of the light from the second source? A) 479 nm B) 497 nm C) 567 nm D) 749 nm E) 794 nm