Heat is added to an ideal gas at 20.°C. If the internal energy of the gas increases by a factor of three during this process, what is the final temperature?
What will be an ideal response?
606.°C
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As a main sequence star evolves off the main sequence, the helium core is contracting while the outer envelope is _______________
Fill in the blank(s) with correct word
Why do volcanic mountain chains, such as the Andes, accompany deep trenches like the Nazca Trench off South America?
What will be an ideal response?
If two sources of slightly different frequency and different amplitudes create waves at the same time, the resulting superposition of those waves can be described as
A) a wave with an amplitude that varies from zero to an amplitude equal to the sum of individual amplitudes. This variation would occur at a frequency equal to the difference in source frequencies. B) a standing wave with an amplitude equal to the average of the amplitudes of the individual waves and a frequency equal to the average of individual frequencies. C) a wave with an amplitude that varies from an amplitude of the difference in individual amplitudes to an amplitude equal to the sum of individual amplitudes. This variation would occur at a frequency equal to the difference in source frequencies. D) a standing wave with an amplitude equal to the sum of the amplitudes of the individual waves and a frequency equal to the average of individual frequencies. E) a standing wave with an amplitude equal to the product of the amplitudes of the individual waves and a frequency equal to the sum of individual frequencies.
A solid concrete wall 4.0 m by 2.4 m and 30 cm thick, with a thermal conductivity of 1.3 W/(m ? K), separates a basement at 18°C from the ground outside at 6°C. Under steady state conditions, how much heat flows through the wall in one hour?
A) 1.8 MJ B) 1.8 kJ C) 500 J D) 5.0 MJ E) 5.0 kJ