The atmosphere of Mars consists mainly of ________.
A. nitrogen
B. carbon monoxide
C. carbon dioxide
D. oxygen
Answer: C
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The speed of light in a material is 1.74 × 10^8 m/s. What is the index of refraction of this material?
a. 1.72 b. 0.58 c. 1.74 d. 0.218
In the context of star clusters, which of the following statements is true of the turnoff point?
A) It is the point on the main sequence of a Hertzsprung-Russell diagram that is used to determine the luminosity class of the stars in the cluster. B) Stars at this point are considered to have just taken birth and have 90 percent of their life remaining. C) The life expectancy of the stars at this point is not equivalent to the age of the cluster. D) It is the point on the main sequence of a Hertzsprung-Russell diagram where stars evolve to the right of the H-R diagram to become giants.
Two long parallel wires are a distance d apart. The current in one wire is 10 A and the current in the other wire is 30 A. The currents are in the same direction. If the 30-A current is increased to 50 A, by what factor does the magnitude of the magnetic field midway between the wires change?
a. 2 b. 4 c. 25/9 d. 5/3
Potential energy can be defined only for non-conservative forces
Indicate whether the statement is true or false