If ? = 24 V, at what rate is thermal energy generated in the 20-? resistor?
a.
13 W
b.
3.2 W
c.
23 W
d.
39 W
a
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In a pulsating variable star, which characteristic of the star changes dramatically with time?
A) mass B) core temperature C) luminosity D) energy-generation process E) rotation rate
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Indicate whether the statement is true or false
What can you conclude about a Type I supernova?
A) It was originally a high-mass star. B) Its spectrum will show large amounts of hydrogen. C) It was originally a low-mass star. D) Its core was mostly iron. E) The star never reached the Chandrasekhar limit.
The laws of thermodynamics can be related to the following: (i) the measurement of temperature, (ii) the lowest temperature possible, (iii) conservation of energy, and (iv) only part of heat energy available may be turned into work. Which of these involve the first and second law?
a. (i) and (ii) c. (i) and (iii) b. (ii) and (iv) d. (iii) and (iv)