The little dipper is an asterism that can be seen in spring from the northern hemisphere
a. True
b. False
Indicate whether the statement is true or false
True
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A refrigerator extracts 65 J of heat from a heat reservoir at
If the coefficient of performance of the refrigerator is 2.5, then how much work is needed to run the refrigerator?
A. 26 J B. 48 J C. 75 J D. 90 J
The principal landform resulting from a stream's erosive power is its ______________-shaped valley
a. V b. W c. M d. I
Why do nocturnal animals usually have large pupils in their eyes? How is that related to the way astronomical telescopes work?
What will be an ideal response?
Fiber optic cable is in the form of a cylinder of fiber with index of refraction 1.67 and cladding around the outside of index of refraction 1.45. What is the maximum angle for light rays inside the fiber with respect to the cable’s axis for which the light will be fully transmitted thanks to total internal reflection?
A. 30o B. 60o C. 41o D. 49o