A rock weighs 30 N on Earth and another rock weighs 30 N on the Moon. Which rock has the greater mass?
A) the one on Earth
B) the one on the Moon
C) They have the same mass.
D) not enough information
Answer: B
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One way astronomers deduce that the Milky Way has a disk is that they
A. see the same number of stars in all directions in the sky. B. see far more stars along the band of the Milky Way than in other directions. C. see a large dark circle silhouetted against the Milky Way in the Southern Hemisphere. D. see stars arranged in a circular region around the north celestial pole. E. None of these choices is correct.
A person's near point is 25 cm, and her eye lens is 2.7 cm away from the retina. What must be the focal length of this lens for an object at the near point of the eye to focus on the retina?
A) -2.4 cm B) 3.4 cm C) 2.6 cm D) -3.4 cm E) 2.4 cm
A uniform linear charge density of 4.0 nC/m is distributed along the entire x axis. Consider a spherical (radius = 5.0 cm) surface centered on the origin. Determine the electric flux through this surface
a. 68 N / m2/C b. 62 N / m2/C c. 45 N / m2/C d. 79 N / m2/C e. 23 N / m2/C
In an article in the New York Times,(75) A. Revkin pointed out that: "In the early 1970s, when scientists first reported that CFCs could destroy ozone, some theorized that the effect would be most discernible in the highest reaches of the
atmosphere over the tropics, partly because of the abundance of sunlight." What happened when the experiments were performed? Explain how the conditions mandated this experimental result.