Among the points and circles shown on this diagram, which one(s) have varying right ascension?
A) the celestial equator and the ecliptic
B) Earth's equator and the celestial equator
C) only the celestial equator
D) the north and south celestial poles
A) the celestial equator and the ecliptic
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A 2.00 kg piece of lead at 40.0°C is placed in a very large quantity of water at 10.0°C, and thermal equilibrium is eventually reached. Calculate the entropy change of the lead that occurs during this process. The specific heat of lead is 130 J/(kg ? K)
A) -12.5 J/K B) 86.0 J/K C) -26.2 J/K D) -86.0 J/K E) -6.24 J/K
You drive your car along the highway at a constant 60 km/h and apply the brakes until the car slows to 40 km/h. If at that moment you suddenly release the brakes, the car tends to
A) momentarily regain its higher initial speed. B) continue moving at 40 km/h. C) decrease in speed if no other forces act.
_____ says that the amount of energy flowing out of the top of a layer in the star must be equal to the amount of energy coming in at the bottom, plus whatever energy is generated within the layer
A) The law of energy equilibrium B) The law of conservation of energy C) Mass-energy equivalence D) Newton's law of energy transfer
Which of the following statements about electrons is not true?
A) Electrons orbit the nucleus rather like planets orbiting the Sun. B) Within an atom, an electron can have only particular energies. C) An electron has a negative electrical charge. D) Electrons have little mass compared to protons or neutrons. E) Electrons can jump between energy levels in an atom only if they receive or give up an amount of energy equal to the difference in energy between the energy levels.