The Sun's average surface (photosphere) temperature is about
A) 1,000,000 K.
B) 5,800 K.
C) 1,000 K.
D) 37,000 K.
B
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How might its capture be relevant to its geological activity?
a. Even though Triton is much smaller than our Moon, Triton' surface shows evidence of relatively recent geological activity. This can be because of the tidal heating that occurred when the moon was captured. b. There is no sign of any geological activity on Triton's surface. This can be because the Triton was captured from the outer space and being much older then the solar system it already lost any noticeable features produced by geological activity. c. There is no sign of any geological activity on Triton's surface. This can be because unlike moons originally formed near the planet, captured Triton did not expirienced Neptune's gravity when it was forming, and all geological activity ended much earlier on Triton than on the other moons. d. Even though Triton is much smaller than our Moon, Triton' surface shows evidence of relatively recent geological activity. This can be because Triton originally was much closer to the Sun and was heated by the solar light until recently.
A 0.50-m long solenoid consists of 1000 turns of copper wire wound with a 4.0-cm radius. When the current in the solenoid is 18 A, the magnetic field at a point 1.0 cm from the central axis of the solenoid is
A. 0.090 mT. B. 0.36 mT. C. 23 mT. D. 36 mT. E. 45 mT.
A flatbed truck is carrying a 20-kg crate up a sloping road. The coefficient of static friction between the crate and the bed is 0.40, and the coefficient of kinetic friction is 0.30
What is the maximum angle of slope that the truck can climb at constant speed if the crate is to stay in place? A) 13° B) 0.38° C) 17° D) 68° E) 22°
Ripples in the Cosmic Microwave Background correspond to
A) matter density fluctuations. B) temperature fluctuations. C) energy fluctuations. D) fluctuations in both matter and radiation. E) imperfections in measurement techniques or equipment.