Consider the following pairs of points: F: 0°N, 40°W G: 70°N, 60°W 0°N, 20°W 70°N, 40°W H: 20°S, 130°E J: 30°S, 170°E 20°S, 150°E 30°S, 170°W Which pair is closest together?
a. J
b. F
c. G
d. H
e. All are the same distance apart.
c
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A steam generator is a device that converts water into steam by capturing radiant heat from hot gases. Consider a 15 foot cubed steam generator, all sides made up of water tubes and a “fire ball” 6 ft. in diameter at 4000ºF at the center. If the water tubes have a surface temperature of 600ºF and an emissivity of 0.7, determine the heat transfer to the water from the combustion gases. Assume the fire ball acts as a black body.
What will be an ideal response?
Gravitational lensing is caused by ____
a. refraction of light through hot intracluster gas b. stimulated emission of light passing through dark matter c. acceleration of photons by supermassive black holes d. scattering of photons off of thin intergalactic dust e. bending of light rays due to the curvature of space-time around a mass
Standing waves are created by the interference of
A. two waves that don’t move B. two waves that move in opposite directions but create a pattern that is stationary C. a moving wave and the medium in which it travels D. light and sound waves
Refracting Telescope: A telescope has an angular magnification of 250 when used with a 20 mm eyepiece. What is the focal length of the objective lens?
A. 5.0 cm B. 25 m C. 5000 cm D. 5.0 m E. 2.5 m