What kind of thermal radiation does Earth emit?
A) infrared light
B) visible and ultraviolet light
C) infrared and visible light
D) infrared, visible, and ultraviolet light
E) visible light
A) infrared light
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The period T of the fundamental mode of the air in a pipe open at one end and closed at the other is equal to what multiple or fraction of the time ?t required for a sound wave to travel from one end of the tube to the other?
A. T = ?t/4 B. T = ?t/2 C. T = ?t D. T = 2?t E. T = 4?t
A motorist makes a trip of 180 miles. For the first 90 miles she drives at a constant speed of 30 mph. At what constant speed must she drive the remaining distance if her average speed for the total trip is to be 40 mph?
A) 45 mph B) 50 mph C) 52.5 mph D) 55 mph E) 60 mph
A boy kicks a football from ground level with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the horizontal component of its velocity just before it hits the ground?
A) 20 m/s B) 8.7 m/s C) 9.8 m/s D) 17 m/s E) 0 m/s
Belt and zone circulation
a. occurs on Jupiter. b. occurs on Saturn c. is caused by rising and sinking gases. d. is more obvious on Jupiter than on Saturn. e. All the above