What makes the North Star, Polaris special?
a) it appears very near the north celestial pole
b)it is the brightest star in the sky
c) it can be used to determine your longitude on Earth
d) it is the star directly on your northern horizon
a) it appears very near the north celestial pole
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The greenhouse effect is occurring because
a. the ozone layer is being depleted b. the amount of carbon dioxide in the atmosphere is increasing c. the ionosphere reflects low frequency radiation d. more ultraviolet radiation is penetrating the atmosphere e. none of the above
A pair of helium nuclei fused together produces
A) helium isotope. B) lithium. C) beryllium. D) carbon. E) iron.
When a wire carries high current causing it to glow, it will emit which type of spectrum?
a. line emission b. line absorption c. continuous d. monochromatic
An irreversible engine operating between the temperatures of 550 K and 300 K extracts 1.20 kJ of thermal energy from the hot reservoir and produces 0.450 kJ of work. How much entropy is created in the process?
A) 0.32 J/K B) 0.68 J/K C) 0.44 J/K D) 0.73 J/K E) 0 J/K