The air at the beach is the same temperature everywhere, but you feel cooler under a beach umbrella because
A. solar radiation is not heating up your skin.
B. the sand underneath you cools off more rapidly than the water vapor in the air.
C. the umbrella gets hot, which thereby cools off the air underneath it.
D. a convection cell forms under the umbrella, thereby cooling you off.
Answer: A
You might also like to view...
A Styrofoam cooler has a surface area of 2,700 cm2 and a wall thickness of 3.0 cm. Styrofoam has a coefficient of thermal conductivity of 0.01 W/m C. A 2.0 kg block of ice is placed inside the cooler that has a temperature inside of 2.0
If the heat of fusion for ice is 333.7 kJ/kg and the temperature outside is 35.0
then how long will the ice last?
A. 74 hours B. 62 hours C. 55 hours D. 42 hours E. 24 hours
Who headed the project to construct the world's first human-made nuclear reactor?
A) Edward Teller B) Leo Szilard C) Albert Einstein D) Enrico Fermi E) J. Robert Oppenheimer
Which of the following depends on the observer's frame of reference?
A) the mass of the proton B) the length of a meter stick C) the half-life of a muon D) all of the other answer choices
The term "timbre" refers to which of the following?
a. Any musical instrument made primarily of wood. b. The quality of sound from instruments due to the mixture of harmonics. c. Instruments that have valves. d. An instrument made in France.