The pressure of a gas depends on the temperature and density of the gas
Indicate whether the statement is true or false
T
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Spectroscopic and eclipse duration observations of an eclipsing binary star can enable astronomers to calculate________ of its individual stars
a. the masses b. the sizes c. the masses and sizes d. neither masses nor sizes
We should expect galaxies to collide fairly often because
a. they are large with respect to their separation distances. b. galaxies contain large amounts of neutral hydrogen. c. galaxies occur in clusters. d. they are large with respect to their separation distances and galaxies occur in clusters. e. None of the other choices are correct.
An ideal incompressible fluid flows at 12 m/s in a horizontal pipe. If the pipe widens to twice its original radius, what is the flow speed in the wider section?
A) 12 m/s B) 6.0 m/s C) 4.0 m/s D) 3.0 m/s
When a hydrogen electron is in its first excited state, its principal quantum number is
a. zero. b. 2. c. –13.60 eV. d. 1.