Wavy bands of light and dark minerals visible in gneiss bedrock probably formed from the
(1) cementing together of individual mineral grains
(2) cooling and crystallization of magma
(3) evaporation of an ancient ocean
(4) heat and pressure during metamorphism
Ans: (4) heat and pressure during metamorphism
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In a chiller unit R-123 evaporates at -20ºC in 1-cm-inside-diameter horizontal tubes. The inside surface temperature of the tubes is estimated as 5ºC and film boiling is assumed. Saturated liquid flows in at 20 g/s and is to leave as saturated vapor. Estimate the necessary tube length required. Use hnf = 183.4 kJ/kg and hng = 367.9 kJ/kg for R-123.
What will be an ideal response?
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How does Earth's varying distance from the Sun affect our seasons?
A) It doesn't; Earth's orbital distance plays no significant role in the seasons. B) It makes summer warmer in the Northern Hemisphere than in the Southern Hemisphere. C) It is responsible for the fact that the seasons are opposite in the Northern and Southern hemispheres. D) It causes the seasons to be more extreme than they would be if the Earth's distance from the Sun were always the same.
You need to make a sharp turn on a flat road, making a radius of curvature of 15 meters. How does the required force of static friction between your tires compare if you make the turn at 30 mph vs. 60 mph?
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