What is happening inside a star while it expands into a subgiant?
A) It is fusing hydrogen into helium in the core.
B) It is fusing hydrogen into helium in a shell outside the core.
C) It is fusing helium into carbon in the core.
D) It is fusing helium into carbon in a shell outside the core.
E) It is not fusing any element; it is contracting and heating up.
B
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Phase Angles: A 50.0-mH inductor is connected in series with a 2500-? resistor in an ac circuit. What is the phase angle at 3000 Hz?
A. 20.7° B. -20.7° C. -75.9° D. 75.9° E. 90.0°
Based on current evidence, which of the following statements about gamma ray bursts is true?
A) They occur in the same types of close binary systems that produce X-ray bursts. B) All those that we have detected occurred in distant galaxies. C) They come primarily from the Milky Way's central black hole. D) All gamma ray bursts are produced by supernovae.
A car is moving down a straight, steep hill. By applying the brake, the driver is able to keep the speed of the car constant. Which of the following statements is true in this situation?
A. The net acceleration is positive. B. There is a net force on the car. C. The net acceleration is negative. D. There is no net force on the car.
A brass plate measures 30.0 cm by 40.0 cm. The coefficient of linear thermal expansion is 
If the temperature of the plate is increased by 10.0 K, then what is the increase in the area of the plate?
A. 0.350 cm2 B. 0.404 cm2 C. 0.456 cm2 D. 0.502 cm2 E. 0.555%