Which of the following nuclear fuels does a twenty-solar-mass star NOT fuse over the course of its entire evolution?
a. hydrogen
b. carbon
c. nitrogen
d. oxygen
e. iron
e
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When observing an object, such as a space ship that is moving very quickly relative to you, the length of objects on that object will appear to be:
A) longer than when they are at rest. B) the same length as when they are at rest. C) shorter than when they are at rest. D) narrower than when they are at rest. E) wider than when they are at rest.
Color TV is produced by
A) cyan, magenta, and yellow beams of electrons merging at the screen. B) red, green, and blue beams of electrons merging at the screen. C) A single beam of electrons striking a triad of phosphors of red, green, and blue. D) A single beam of electrons striking a triad of phosphors of cyan, magenta, and yellow.
The slope of a position versus time graph gives
A) the distance traveled. B) velocity. C) acceleration. D) displacement.
A weather balloon contains 12.0 m3 of hydrogen gas when it is released from a location at which the temperature is 22°C and the pressure is 101 kPa
It rises to a location where the temperature is -30°C and the pressure is 20 kPa. If the balloon is free to expand so that the pressure of the gas inside is equal to the ambient pressure, what is the new volume of the balloon? A) 14.0 m3 B) 2.38 m3 C) 49.9 m3 D) 82.6 m3 E) 4.16 m3