A 2-mol ideal gas system undergoes an adiabatic process where it expands and does 20 J of work on its environment. How much heat is received by the system?
a. ?20 J
b. zero
c. +10 J
d. +20 J
e. ?10 J
b
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Express the following number to three significant figures: 21.25 m
What will be an ideal response?
The broad emission lines of Seyfert galaxies imply high gas speeds in the nucleus
a. True b. False Indicate whether the statement is true or false
Mort and Velma are twins, born at the same time on Earth. Velma is taken on a long trip into outer space, at a speed close to lightspeed, and returns to Earth. When she returns,
A) Mort observes that he is younger than Velma, but Velma will observe that she is younger than Mort. B) Mort and Velma observe that they have aged equally. C) Mort observes that he is older than Velma, and Velma observes that she is older than Mort. D) Mort and Velma both observe that Velma is older than Mort. E) Mort and Velma both observe that Mort is older than Velma.
This Hubble Space Telescope photo shows a planetary nebula. What is the white dot in the center (indicated by the arrow)?
A) a white dwarf B) a red giant star with a strong stellar wind C) a neutron star D) a protostar that will soon become a main-sequence star