The mass of Mars, 6.40 × 1023 kg, is about one-tenth that of the Earth, and its radius, 3395 km, is about half that of Earth. What is the mean density of Mars?
What will be an ideal response?
3.90 × 1012 kg/ km3
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According to Mathiessen’s rule, the electrical resistivity of a metal is the _________of electrical resistivity of 0, 1, 2, and 3-dimensional defects and thermal vibrations.
Fill in the blank(s) with the appropriate word(s).
The diagram shows a plot of the temperature of the sun as a function of distance above the bottom of the photosphere. At what distance above the bottom of the photosphere is the temperature of the sun the smallest?
a. 1000 km
b. 2300 km
c. 2500 km to 4000 km
d. 500 km
e. a and c
Which of the following is true of Phobos?
A) It is bigger than Mars. B) It is almost certainly a captured asteroid. C) Its gravitational acceleration is equivalent to that of Earth. D) Its atmosphere is completely made of nitrogen.
A thin copper rod that is 1.0 m long and has a mass of 0.050 kg is in a magnetic field of 0.10 T. What minimum current in the rod is needed in order for the magnetic force to cancel the weight of the rod?
A) 1.2 A B) 2.5 A C) 4.9 A D) 7.6 A E) 9.8 A