What happens after the helium flash in the core of a star?
A) The core quickly heats up and expands as helium fusion begins all at once throughout the core.
B) The star breaks apart in a violent explosion.
C) The core suddenly contracts because the helium disappears after being fused.
D) The core stops fusing helium.
E) The star starts to fuse helium in a shell outside the core.
A) The core quickly heats up and expands as helium fusion begins all at once throughout the core.
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Why did Copernicus hesitate to consider alternatives to the Ptolemaic Universe? a. A heliocentric Universe contradicted Christian theology at the time
b. There was no way to prove uniform circular motion. c. New star formation showed no parallax. d. Most people already believed in a heliocentric Universe. e. His mathematics could not disprove Ptolemy's epicycles, deferents and equants.
In one-dimensional motion where the direction is indicated by a plus or minus sign, the average velocity of an object has which of the following properties?
a. It is positive. c. It is zero. b. It is negative. d. It can be positive, negative, or zero.
When light from the air enters a raindrop, the light
A) slows down. B) remains at speed c. C) speeds up. D) none of the above
A parallel plate capacitor of capacitance C0 has plates of area A with separation d between them. When it is connected to a battery of voltage V0, it has charge of magnitude Q0 on its plates. The plates are pulled apart to a separation 2d while the capacitor remains connected to the battery. After the plates are 2d apart, the capacitance of the capacitor and the magnitude of the charge on the plates are what?
A.
C0, 
Q0B.
C0, Q0C.
D.
E.