How many times faster does sound travel through iron rails than through air at 20.°C?
A) 12.8
B) 13.1
C) 12.2
D) 13.6
E) 13.9
B
You might also like to view...
What is the "raisin cake analogy" to the expanding universe intended to explain?
A) That as a raisin cake expands, every raisin moves away from every other raisin, just as galaxies move away from each other in an expanding universe. B) That raisins, like galaxies, expand in size as the cake or universe expands. C) That from within the raisin cake, you would see other raisins moving away from you only if you were on the central raisin, just as you see galaxies moving away only if you are in the center of the universe. D) That the universe heats up as it expands, just as the raisin cake heats up as it bakes.
If the half-life of an element is big, that means that
A. it decays faster than one with a small half-life B. it decays slower than one with a small half-life C. it belongs to a very heavy element D. it emits lots of neutrons when it decays
Second Law of Thermodynamics: Which one of the following is a true statement?
A. The second law of thermodynamics is a consequence of the first law of thermodynamics. B. It is possible for heat to flow spontaneously from a hot body to a cold one or from a cold one to a hot one, depending on whether or not the process is reversible or irreversible. C. It is not possible to convert work entirely into heat. D. It is impossible to transfer heat from a cooler to a hotter body. E. All of these statements are false.
Gravitational potential energy is equal to the ______________ of an object times its height
Fill in the blank(s) with correct word