An astronaut goes out for a "space-walk" at a distance above the earth equal to the radius of the earth. What is her acceleration due to gravity at that point?
A) g B) g/ C) g/2 D) zero E) g/4
E
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Four waves are described by the following expressions, where distances are measured in meters and times in seconds
I y = 0.12 cos(3x - 21t) II y = 0.15 sin(6x + 42t) III y = 0.13 cos(6x + 21t) IV y = -0.23 sin(3x - 42t) Which of these waves travel in the +x direction? A) I and II B) I and III C) II and IV D) I and IV E) II and III
Consider the segment of cylindrical metal wire shown below. Assume that the drift speed of electrons is everywhere the same in the segment. Note that area B is tilted so that its nose vector makes an angle of ? < 90° with the drift velocity direction but still spans the wire’s entire cross section. How do the current density fluxes through areas A and B compare?
A. The flux through A is greater than the flux through B.
B. The flux through B is greater than the flux through A.
C. The fluxes through A and B are the same.
A friend from Europe asks what the length of a 100-yd football field would be in meters. After doing the conversion, what would you tell her?
The temperature variations of the cosmic microwave background observed by the Planck telescope agree well with our model predictions. This provides persuasive evidence in favor of what?
A) both the Big Bang and inflation B) only the Big Bang, but not inflation C) not the Big Bang, but inflation D) neither the Big Bang nor inflation