The sun has a radius of
km and a rotational period of 25.38 days. What is the difference is there in the peak of the observed spectrum between light received from the approaching side of the Sun and from the receding side of the sun? Observations from the middle of the sun place the spectral peak at 480 nm.
A. 13 nm
B. 6.4 nm
C. 1.6 nm
D. 3.2 nm
B. 6.4 nm
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What is the primary reason why a star of twice the mass of the Sun is considered an unlikely candidate for finding an extraterrestrial civilization?
A. It is too hot and emits too much ultraviolet radiation. B. The star's gravity is too strong. C. Its main-sequence lifetime is too short. D. High-mass stars produce only high-mass planets.
Magnetism is due to the motion of electrons as they
A) move around the nucleus. B) spin on their axes. C) both of these D) neither of these
A 7.5-kg otter slides down a hill, starting from rest at the top. The sloping surface of the hill is 8.8 m long, and the top is 6.5 m above the base
If the speed of the otter at the bottom of the hill is 9.2 m/s, how much energy was lost to nonconservative forces on the hill?
Which characteristic of Earth explains why we have an ultraviolet-absorbing stratosphere?
A) the existence of photosynthetic life B) the existence of plate tectonics C) the moderate surface temperature D) the existence of oceans