All of the following are true. Which of the following gives evidence that Earth's orbit is not perfectly circular?
A) The Sun's angular size changes throughout the year.
B) Earth's seasons are not of exactly equal length.
C) In North America, it is hotter in July than January.
D) Both A and C
E) Both A and B
E
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According to the planetary migration model, the jovian planets are thought to have formed:
A) in the orbit where they are now. B) further from the Sun than they are now. C) in another solar system. D) closer to the Sun than they are now. E) None of the above.
A star with a parallax of 1 second of arc is at a distance of ________ by definition
Fill in the blank(s) with correct word
A 45-mH ideal inductor is connected in series with a 60-? resistor through an ideal 15-V DC power supply and an open switch. If the switch is closed at time t = 0 s, what is the current 7.0 ms later?
A) 250 mA B) 650 mA C) 550 mA D) 280 mA E) 850 mA
The distance between the two planets is 1.6 × 106 m. How much time would the light signal take to go from one planet to the other?
A) 1.9 × 10-2 s B) 0.45 × 10-2 s C) 0.53 × 10-2 s D) 1.3 × 10-2 s E) None of the other answers is correct.