Which is the correct order of the planets, moving from closest to the Sun to farthest from the Sun?
a. Mercury, Venus, Earth, Saturn, Mars, Jupiter, Neptune, Uranus
b. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
c. Venus, Mercury, Mars, Earth, Saturn, Jupiter, Neptune, Uranus
d. Mars, Venus, Earth, Mercury, Jupiter, Saturn, Uranus, Neptune
e. Mercury, Venus, Earth, Mars, Jupiter, Saturn, Neptune, Uranus
b
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Stars with surface temperatures near 10,000 K have the strongest hydrogen absorption lines in their spectra.
Answer the following statement true (T) or false (F)
Which of the following materials present in the solar system had the highest condensation temperatures?
A) metals B) rocks C) hydrogen and helium gases D) hydrogen compounds like water, methane, and ammonia
A cylindrical tank is assembled by welding steel sections circumferentially. Tank diameter is 1.5 m, thick- ness is 20 mm, and internal pressure is 2.0 MPa. The maximum shear stress in the heads is approximately:
(A) 19 MPa
(B) 23 MPa
(C) 33 MPa
(D) 35 MPa
Suppose we observe a source of X-rays that varies substantially in brightness over a period of a few days. What can we conclude?
A) The X-ray source is a quasar. B) The X-ray source contains a black hole with an accretion disk. C) The X-ray source is no more than a few light-days in diameter. D) The X-ray source must have a strong, rapidly varying magnetic field. E) We are seeing the rapid orbit of two stars in a binary system.