There is a main-sequence mass-luminosity relation because
a. helium fusion produces carbon.
b. stars expand when they become giants.
c. more massive stars support their larger weight by making more energy.
d. the helium flash occurs in degenerate matter.
e. all stars on the main sequence have about the same radius.
c
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Phase Angles: A 120-V rms voltage at 60 Hz is applied across an RC circuit. The rms value of the current in the circuit is 0.60 A, and it leads the voltage by 60°. What is the resistance in this circuit?
A. 100 ? B. 150 ? C. 120 ? D. 60 ? E. 200 ?
What is the average power dissipated by a resistor of resistance R = 25 ? in an LRC circuit for which the power factor is equal to 0.25 and the maximum voltage of the AC source is 8 V?
A) 0.04 W B) 0.32 W C) 0.16 W D) 0.62 W E) 0.08 W
________________ is a spacing technique that allows text to be squeezed or stretched as necessary to fit in a specific amount of space.
A. Kerning B. Primary C. Tracking D. Typography Reset Selection
The largest volcanic structures on Venus are called:
A) shield volcanoes. B) cinder cones. C) coronae. D) calderas. E) crater cones.