The Sun's surface, as we see it with our eyes, is called the ________
A) corona B) chromosphere C) core D) photosphere
D
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A bucket of water with total mass 23 kg is attached to a rope, which in turn is wound around a 0.050-m radius cylinder, with crank, at the top of a well. The moment of inertia of the cylinder and crank is 0.21 kgm2 . The bucket is raised to the top of the well and released to fall back into the well. What is the kinetic energy of the cylinder and crank at the instant the bucket is moving with a
speed of 6.0 m/s? a. 2.1 × 10^3 J c. 0.86 × 10^3 J b. 1.5 × 10^3 J d. 0.40 × 10^3 J
The highest energy level in an atom corresponds to n = _________
Fill in the blank(s) with correct word
Radiative energy is
A) energy carried by light. B) heat energy. C) energy from nuclear power plants. D) energy of motion.
The vast majority of stars in a newly formed star cluster are ________
A) red giants B) very high-mass, type O and B stars C) less massive than the Sun D) about the same mass as our Sun