In Einstein's special theory of relativity, there is one basic principle [or assumption, or law] that seems very odd to our intuitions, and that is responsible for the odd nature of Einstein's conclusions. This basic principle is
A) the idea that all motion is merely relative motion, i.e., that it is impossible to determine how fast you are moving without measuring against something outside your laboratory.
B) E = mc2.
C) the idea that mass is relative, and is larger when it is moved faster.
D) relativistic length contraction.
E) the idea that light has the same speed for all nonaccelerated observers.
E
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A) geothermal power plant B) wind turbines C) hydroelectric power plant D) All of the above. E) None of the above.
A satellite in an elliptical orbit about a planet travels much faster when it is directly over a
A) large ocean. B) large island. C) high mountain range. D) great plain or plateau. E) none of the above
What is a thermal boundary layer?
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An incompressible fluid is flowing through a pipe with a constriction. The pipe is on an incline with an angle of 30.0 degrees. The narrow section is 10.0 m from the wide section and the narrow section is higher than the wide section. The velocity of the fluid in the wide section of the pipe is 4.00 m/s and the velocity of the fluid in the narrow section of pipe is 9.00 m/s. The pressure of the fluid in the wide section is 250 kPa. What is the pressure in the narrow section of the pipe? (density of the fluid is 1000 
A. 169 kPa B. 175 kPa C. 180 kPa D. 193 kPa E. 205 kPa