Heat flows into a gas in a piston and the gas performs some work on its surroundings. The amount of work done is less than the heat added. In this situation,
A. the internal energy of the gas did not change.
B. the gas experienced a phase change.
C. the internal energy of the gas decreased.
D. the internal energy of the gas increased.
E. energy is not conserved and so it cannot happen.
Answer: D
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Synchrotron radiation is produced by
a. objects with temperature below 10,000 K. b. high-velocity electrons moving through a magnetic field. c. cold hydrogen atoms in space. d. the collapsing cores of massive stars. e. a helium flash.
Gravitational Force: What is the magnitude of the gravitational force that two small 7.00-kg balls exert on each other when they are 35.0 cm apart? (G = 6.67 × 10-11 N ? m2/kg2)
Fill in the blank(s) with the appropriate word(s).
It is bright everywhere. You have been able to travel around, and it's clear that you are not inside a star. Yet your surroundings seem as bright as looking directly at the Sun
As you travel around, you notice that you cannot find a single neutral atom anywhere, nor can you find any nucleus besides those of hydrogen and helium. While it is hot (a few thousand degrees Kelvin), it is nowhere near the temperature needed for nuclear fusion. Where are you? A) You are in the planetary nebula that the Sun will form about 5 billion years from now. B) You are in an accretion disk around a supermassive black hole. C) You are in the universe more than 10100 years in the future. D) You are in the universe during its first 380,000 years. E) You are in the central regions of a quasar.
The process by which geologists construct
an organized picture of the geology of large areas and even entire continents is called? a) fossil indexing. b) correlation. c) randomization. d) time scale analysis.