Center of Mass: Consider the sun and its largest planet Jupiter. On the line joining them, how far from the center of the sun is their center mass? Is it within or outside the sun? (Jupiter-sun distance is 778 × 106 km, diameter of the sun is 1.4 × 106 km, the sun is 1000 times as massive as Jupiter)
What will be an ideal response?
0.78 × 106 km from the center of the sun, just outside the solar surface
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A) Pluto B) Neptune C) an asteroid in the asteroid belt D) a comet in the Kuiper belt E) a comet in the Oort cloud
For electric power that costs 10 cents per kilowatt hour, the cost of operating a 110-V heater that uses 20 A for 10 hours is
A) $0.22. B) $0.55. C) $2.20. D) $5.50. E) none of the above
When photon absorption occurs in a hydrogen
atom, the principal quantum number of the electron must a) decrease. b) remain the same. c) increase. d) become identical to that of a ground state electron. •
When light travels from air into water, what happens to the speed of the wave?
A. Nothing, the speed of light is always constant. B. It depends on the angle of the light. C. The speed increases. D. The speed decreases.