A basketball is thrown with a velocity of 20. m/s at an angle of 60.° above the horizontal. What is the horizontal component of its instantaneous velocity at the exact top of its trajectory? (Neglect air friction.)
A) 10. m/s
B) zero
C) 20. m/s
D) 17.3 m/s
E) 20. tan(60°) m/s
A
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A certain ideal gas has a molar specific heat at constant pressure of 7R/2. What is its molar specific heat at constant volume?
A) 5R/2 B) 3R/2 C) 8R D) 9R/2 E) 6R
The principle of superposition tells us that, if two waves cross paths,
A. the speed is the speed of the faster wave. B. the wavelength is the sum of the individual wavelengths. C. the frequency is the sum of the individual frequencies. D. the amplitude is the sum of the individual amplitudes.
Mercury's crust
A. is much thicker than Earth's or Venus's. B. is molten because it is so close to the Sun. C. has an unusually high concentration of silicate rocks. D. may have been mostly lost after a collision with a large planetesimal.
Suppose you live at latitude 40°N. Which of the following describes the path of the celestial equator through your sky?
A) It extends from due east on your horizon, to an altitude of 50° in the south, to due west on your horizon. B) It extends from due south on your horizon, to your zenith, to due north on your horizon. C) It extends from due east on your horizon, to an altitude of 40° in the south, to due west on your horizon. D) It extends from due east on your horizon, to an altitude of 40° in the north, to due west on your horizon.