An airplane is flying with constant speed along a horizontal circle. Is the direction of its acceleration constant?
What will be an ideal response?
No. The acceleration is directed towards the center of the circle, so the acceleration vector rotates as the body rotates.
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The Sun's path, as viewed from the equator, is highest in the sky on
A) the December solstice. B) the March and September equinoxes. C) the June solstice. D) the day when Earth is closest to the Sun.
Energy is transported from the tropics to the polar regions chiefly by
A) winds. B) ocean currents. C) interchange of carbon dioxide. D) none of the above
A fish looks up at his attacker, an eagle, who is straight above the fish – though the fish lies 15cm beneath the surface of the water and the eagle is 1.5m above the surface. How far above the fish does the eagle appear to be?
A. 2.15m B. 2.0m C. 1.65m D. 1.5m
An engine is designed to obtain energy from the temperature gradient of the ocean. What is the thermodynamic efficiency of such an engine if the temperature of the surface of the water is 59°F (15°C) and the temperature well below the surface is 41°F (5°C)?
a. 3.5% b. 67% c. 31% d. 17% e. 96%