At very large distances from the Sun, its corona turns into the solar wind
Indicate whether the statement is true or false
TRUE
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The wavelengths that are most likely for communication with other civilizations are those in the water hole
Indicate whether the statement is true or false
A body on the surface of the earth weighs 400 lb. The radius of the earth is about 4,000 miles. If this same body were placed on a 4,000 mile high tower, its weight would be
a. 100 lbs b. 200 lbs c. 400 lbs d. 800 lbs e. 16,000 lbs
Two wires with the same resistance have the same diameter but different lengths. If wire 1 has length L1 and wire 2 has length L2, how do L1 and L2 compare if wire 1 is made from copper and wire 2 is made from aluminum? The resistivity of copper is 1.7 × 10^–5 ?·m and the resistivity of aluminum is 2.82 × 10^–5 ?·m
a. L1 = 1.7 L2 b. L1 = 0.60 L2 c. L1 = 2.8 L2 d. L1 = 0.36 L2
The lamps in a string of Christmas tree lights are connected in parallel. What happens if one lamp burns out? (Assume negligible resistance in the wires leading to the lamps.)
A) The brightness of the lamps will not change appreciably. B) The other lamps get brighter equally. C) The other lamps get brighter, but some get brighter than others. D) The other lamps get dimmer equally. E) The other lamps get dimmer, but some get dimmer than others.