Identify a true statement about planets
A) They are the size of the Sun.
B) They shine by reflecting sunlight.
C) There are nine planets in our Solar System.
D) There generate energy by nuclear fusion reactions.
B
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A solid cylinder of radius R = 1.0 m and mass 10 kg rotates about its axis. When its angular velocity is 10 rad/s, its angular momentum (in kg×m2/s) is
a. 50. b. 20. c. 40. d. 25. e. 70.
The magnification M = -di/do is the ratio of image to object
A) angular size. B) distance. C) focal distances. D) heights.
(Choose all that apply.) An observatory in space could in principle detect
A) visible light. B) x-rays. C) infrared light. D) ultraviolet light. E) radio waves. F) gamma rays.
A 25-L container holds ideal hydrogen (H2) gas at a gauge pressure of 0.25 atm and a temperature of 0°C
What mass of hydrogen gas is in this container? The ATOMIC mass of hydrogen is 1.0 g/mol, the ideal gas constant is R = 8.314 J/mol ? K = 0.0821 L ? atm/mol ? K, and 1.00 atm = 101 kPa. A) 1.4 g B) 2.8 g C) 4.2 g D) 5.6 g E) 6.3 g