A high-mass star dies more violently than a low-mass star because:
A) it must always end up as a black hole.
B) it generates more heat and its core eventually collapses very suddenly.
C) it cannot fuse elements heavier than carbon.
D) gravity is weakened by its high luminosity.
E) it is most often found as part of a binary system.
B
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The energy required to accelerate a ship the mass of an ocean liner to a cruising speed of 10% of the speed of light is approximately
A) one million times the Earth's current annual energy usage B) one hundred times the Earth's current annual energy usage C) equal to the Earth's current annual energy usage D) ten times the Earth's current annual energy usage
An earthquake emits both P-waves and S-waves that travel at different speeds through the Earth. A P-wave travels at 9 000 m/s and an S-wave at 4 000 m/s. If P-waves are received at a seismic station 34.0 s before an S-wave arrives, how far is the station from the earthquake center?
a. 1.22E+5 m b. 4.90E+5 m c. 2.45E+5 m d. 9.42E+4 m e. 1.70E+5 m
Strings that have more mass on a musical instrument than others produce notes of
A) higher frequency. B) lower frequency. C) the same frequency.
Consider two containers with the same volume and temperature. Container One holds "dry" air--a mixture of nitrogen and oxygen. Container Two holds "moist" air. The "moist" air has the same ratio of nitrogen to oxygen molecules, but also contains water vapor. According to the ideal gas law, if the pressures are equal, the weight of the gas in Container One will be
a. lighter than the gas inside the second container. b. equal to the weight of the gas in the second container. c. heavier than the gas inside the second container. d. all the above are incorrect because the pressures cannot be equal.