How long does the synodic month take, and how it this observed?
What will be an ideal response?
The phase cycle of the Moon takes 29.5 days to return to exactly the same phase.
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Each of the following lists two facts. Which pair of facts can be used with Newton's version of Kepler's third law to determine the mass of the Sun?
A) Mercury is 0.387 AU from the Sun and Earth is 1 AU from the Sun. B) Earth rotates in one day and orbits the Sun in one year. C) The mass of Earth is 6 × 1024 kg and Earth orbits the Sun in one year. D) Earth is 150 million km from the Sun and orbits the Sun in one year.
An object with a rest mass of 0.456-kg is moving at 1.20 × 108 m/s. What is the magnitude of its momentum? (c = 3.00 × 108 m/s)
A) 5.57 × 107 kg ? m/s B) 5.67 × 107 kg ? m/s C) 5.97 × 107 kg ? m/s D) 5.47 × 107 kg ? m/s E) 5.87 × 107 kg ? m/s
Which of the following statements about exponential growth is/are TRUE? a. Exponential growth is characterized by its doubling time. b. Exponential growth occurs when growth in a quantity depends on how much of thequantity there was at the beginning
c. Exponential growth occurs much faster than linear growth.. d. All of the above statements are true. e. Only statements a. and b. are true.
Has Polaris always been a good "North Star"? Why or why not?
A) yes, because stars stay fixed on the celestial sphere B) no, because it is a young star which formed only a few hundred years ago C) no, because Earth's axis slowly changes the direction it points D) no, because ancient people did not know how to describe directions on Earth