If we have a new moon today, when we will have the next full moon?
A) in about two weeks
B) in about one week
C) in about a month
D) in about six months
A) in about two weeks
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When examining a spectrum of a particular galaxy, an astronomer notices that thespectral lines are shifted toward shorter wavelengths. What does this mean?
a) the element Helium is present in that galaxy b) the galaxy is moving away from us c) the galaxy is very likely to be one of the nearest galaxies to the MilkyWay d) the entire Universe is contracting e) the galaxy is rotating very rapidly
A machinist needs to remove a tight fitting pin of material A from a hole in a block made of material B. The machinist heats both the pin and and the block to the same high temperature and removes the pin easily
What statement relates the coefficient of thermal expansion of material A to that of material B? A) Material B has a greater coefficient of expansion than does material A. B) The situation is not possible, heating block B will shrink the hole in the material as the material expands with increasing temperature. C) Material B has the same coefficient of expansion as does material A. D) Material B has a negative coefficient of expansion and A has a positive coefficient of expansion. E) Material A has a greater coefficient of expansion than does material B.
A heat engine has an efficiency of 35.0% and receives 150 J of heat per cycle
(a) How much work does it do in each cycle? (b) How much heat does it "waste" in each cycle?
From laboratory measurements, we know that a particular spectral line formed by hydrogen appears at a wavelength of 121.6 nanometers (nm). The spectrum of a particular star shows the same hydrogen line appearing at a wavelength of 121.8 nm. What can we conclude?
A) The star is moving toward us. B) The star is moving away from us. C) The star is getting hotter. D) The star is getting colder. E) The "star" actually is a planet.