A light-year is
A) about 10 trillion kilometers.
B) the time it takes light to reach the nearest star.
C) the time it takes light to travel around the Sun.
D) about 300,000 kilometers per second.
A) about 10 trillion kilometers.
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Which of these statements is true about the rotation of Earth?
a. Earth does not precess. b. Precession only applies in conditions of gravity, so Earth cannot precess. c. Earth is a slightly irregular sphere and precesses very slowly. d. Earth is a very irregular imitation of a sphere, and precesses very fast. e. Earth's North Pole has always pointed toward the star Polaris.
Thin Films: A soap bubble, when illuminated at normal incidence with light of 463 nm, appears to be especially reflective. If the index of refraction of the film is 1.35, what is the minimum thickness the soap film can be if it is surrounded by air?
Fill in the blank(s) with the appropriate word(s).
The molecular weight of carbon dioxide is 44.0 g/mol. What is the internal energy in 3.00 kg of carbon dioxide at 300 K? As an approximation, treat the carbon dioxide gas as if it was monatomic
A) 2.55 × 105 J B) 1.70 × 105 J C) 2.55 × 104 J D) 1.70 × 104 J E) 1.70 × 106 J
A 2000-kg sailboat experiences an eastward force of 3000 N by the ocean tide and a wind force against its sails of magnitude 6000 N directed toward the northwest (45° N of W). What is the magnitude and direction of the resultant acceleration?