The solar constant for Earth is
A) 0.7 kW/m2.
B) 1.0 kW/m2.
C) 1.4 kW/m2.
D) more than 1.4 kW/m2.
Answer: C
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Energy Conservation With Conservative Forces: Joe and Bill throw identical balls vertically upward. Joe throws his ball with an initial speed twice as high as Bill. If there is no air resistance, the maximum height of Joe's ball will be
A. four times that of Bill's ball. B. two times that of Bill's ball. C. equal to that of Bill's ball. D. eight times that of Bill's ball. E. roughly 1.4 times that of Bill's ball.
All of the Solar System's dwarf planets are located in the Kuiper belt.
Answer the following statement true (T) or false (F)
A child throws a ball with an initial speed of 8.0 m/s at an angle of 40° above the horizontal. The ball leaves her hand 1.0 m above the ground. At what angle below the horizontal does the ball approach the ground assuming no effects of air?
A) 35° B) 42° C) 48° D) 40° E) 65°
Two loudspeakers are placed facing each other and driven by the same source at 680 Hz. A listener is positioned between the two speakers on the line separating them, thus creating a constructive interference at the listener's ear. What minimum distance would one of the speakers be moved back away from the listener to produce destructive interference at the listener's ear? (The speed of sound =
340 m/s.) a. 0.13 m c. 0.50 m b. 0.25 m d. 1.00 m