Two billiard balls have velocities of 2.0 m/s and -1.0 m/s when they meet in an elastic head-on collision. What is the final velocity of the second ball after collision?
a. +2.0 m/s
c. -0.5 m/s
b. -1.0 m/s
d. +1.0 m/s
A
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Diffraction Gratings: The distance between the ruled lines on a diffraction grating is 1900 nm. The grating is illuminated at normal incidence with a parallel beam of white light in the 400 nm to 700 nm wavelength band. What is the angular width of the gap between the first order spectrum and the second order spectrum?
A. 3.3° B. 4.3° C. 5.3° D. 6.3° E. 2.3°
What would happen to Earth if we somehow moved our planet to the orbit of Venus?
A) Earth would suffer a runaway greenhouse effect and become as hot as or hotter than Venus. B) Temperatures would rise only slightly, but enough to melt the polar caps. C) The fact that we have oceans would moderate the temperature change because of moving our planet, so temperature would hardly change at all. D) Being so much closer to the Sun would almost immediately cause the surface of Earth to melt, and all our cities would then be destroyed by the hot lava.
The atmosphere of Jupiter is more than 1000 km thick. From Jupiter's surface, the Sun at noon would appear
A) white. B) faintly white. C) not at all. D) none of the above
The filament in a light bulb has a diameter of 0.050 mm and an emissivity e = 1.0. The temperature of the filament is 3000°C. How long should the filament be in order to radiate 60 W of power?
The Stefan-Boltzmann constant is 5.67 × 10-8 W/(m2?K4). A) 11 cm B) 9.4 cm C) 8.6 cm D) 7.2 cm E) 5.9 cm