Thunder is caused by ____
A) the collision between two thunderstorms with opposite electrical charge
B) the rapid heating of air surrounding a lightning channel
C) the explosion that occurs when + and - charge collide and neutralize each other
D) turbulent wind motions inside the thunderstorm
B
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In order to increase the thermal resistance of a typical exterior frame wall, it is customary today to use 2 × 6 studs instead of 2 × 4 studs to allow for the placement of more insulation within the wall cavity. A typical exterior (2 × 6) frame wall of a house consists of the materials shown in Figure P5.13. Assume an inside room temperature of 68oF, an outside air temperature of 20oF, and an exposed area of 150 ft2 . Determine the heat loss through this wall.
Science is a body of knowledge that goes back to
A) humankind's beginnings. B) Greece in the seventh century B.C. C) Italy in the sixteenth century. D) the time of Galileo.
You're driving down the highway and a bug spatters on your windshield. Which undergoes the greater change in momentum?
A) the bug B) your car C) both the same
Many larger rivers in the Colorado Plateau region meander in deep, narrow canyons and have no floodplains. How could this happen?
A) Original, youthful streams continued to downcut as the land rose. B) As sea level dropped, the original youthful streams matured into old-age streams. C) As sea level rose, the original, old age streams were rejuvenated. D) Original, old age streams downcut as the land gradually rose.