Light bends when it
A) passes a massive star.
B) passes through a gravitational field.
C) both of these
D) neither of these
Answer: C
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The second law of thermodynamics forbids a heat engine to have thermal efficiency of ______________
Fill in the blank(s) with correct word
Determine the view factors F12 and F21 for the following geometries (as shown in the figure): (a) a sphere of diameter, D, inside a cubic box of length L=D, (b) one side of a diagonal partition in a long square duct of side L, and (c) the end and side of a circular tube with a diameter equal to its length.
GIVEN
Geometrical configurations shown above
FIND
The view factors F12 and F21
SKETCH
Kepler's third law of planetary motion states, "A planet's _____ squared is proportional to its average distance from the Sun cubed."
a. radius b. diameter c. rotational speed d. orbital period e. rotational period
How fast do the fastest pulsars spin?
A: About 1200 times per second (twice as fast as a blender can go) B: About 600 times per second (fastest speed on a blender) C: About 300 times per second (half the top speed of a blender) D: About 60 times per second E: Exactly once per second, like clockwork