Which of the following divisions of time cannot be changed by a human decision?
a. 60 minutes in an hour
b. 365.2422 days in a year
c. 7 days in a week
d. 24 hours in a day
b
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For the triangular micro heat pipe arrangement shown in Figure 9-41, estimate the permeability of the wick.
The relationship 
for an elliptical orbit follows from the fact that the satellite’s velocity is perpendicular to its position vector at the two extreme points and also from
A. Conservation of angular momentum. B. Conservation of energy. C. Conservation of momentum. D. Newton’s second law. E. Some other properties of ellipses. F. (The given relationship is false!)
According to conservative estimates, the end of habitability of Earth will come about
A) 3 to 4 billion years from now B) a few hundred thousand years from now C) 100 million years from now D) a billion years from now
Suppose you have three identical lightbulbs, some wire, and a battery. You connect one lightbulb to the battery and take note of its brightness. You add a second lightbulb, connecting it in series with the previous lightbulbs, and again take note of the brightness. Repeat the process with the third lightbulb, connecting it in series with the other two. As the lightbulbs are added, the individual
currents in the lightbulbs (neglect the battery’s internal resistance) 1.increases. 2.decreases. 3.remains the same. 4.Need more information.