Which parts of the Sun's radiation are responsible for heating Earth's surface?
A) the radio and the ultraviolet
B) the X-ray and the gamma ray
C) the ultraviolet and the visible
D) the visible and the infrared
E) the infrared and the high energy particles
D
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Which form of electromagnetic radiation would be blocked in the stratosphere by ozone?
A) cosmic rays B) ultraviolet C) visible light D) infrared E) microwaves
A fireman is sliding down a fire pole. As he speeds up, he tightens his grip on the pole, thus increasing the vertical frictional force that the pole exerts on the fireman
When the force exerted on his hands equals the force that Earth exerts on him, what happens to the fireman? A) The fireman comes to a stop. B) The fireman descends with slower and slower speed. C) The fireman descends with a smaller but non-zero acceleration. D) The fireman continues to descend, but with constant speed. E) The acceleration of the fireman is now upward.
When ice crystals collapse at the surface of ice, the result is a
A) thin film of water. B) slippery surface. C) both of these. D) none of the above
The single most important determinant of the temperature, density, radius, luminosity, and pace of evolution of a protostar is its:
A) chemical composition. B) magnetic field. C) spin. D) mass. E) molecular composition.