How was the true rotation rate of Venus determined? Why does this make study of the Venusian surface hard for observers on the Earth?
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Radar studies of Venus finally determined that Venus' rotation rate is 243 days, retrograde. Studies of its entire surface from Earth, using radar, is complicated by the fact that almost the same face of Venus appears pointed towards Earth when the two planets are closest.
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A solenoid of length 18 cm consists of closely spaced coils of wire wrapped tightly around a wooden core. The magnetic field strength is 2.0 mT inside the solenoid near its center when a certain current flows through the coils
If the coils of the solenoid are now pulled apart slightly, stretching it to 21 cm without appreciably changing the size of the coils, what does the magnetic field become near the center of the solenoid when the same current flows through the coils? (?0 = 4? × 10-7 T • m/A) A) 1.7 mT B) 3.4 mT C) 0.85 mT D) 2.0 mT
If the outside air pressure decreases, the reading on a tire gauge connected to a tire
a. stays the same. b. increases. c. decreases. d. can not be determined.
The solar constant is a measure of
a. the amount of solar energy reaching Earth.
b. the length of the sunspot cycle.
c. the period of rotation of the Sun's equator.
d. the average number of sunspots seen during the Maunder minimum.
e. the Sun's mass.
Explain why Uranus experiences extreme seasons
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