Suppose the Galilean transformation equations are true and your spaceship is moving at twice the speed of light relative to the ether. What odd things will you observe in your spaceship? Select all that apply. (If you are using the back of the book to communicate your answers, you can point to multiple letters with several fingers.)
A. You won’t be able to see anything behind you.
B. You won’t be able to see anything in front of you.
C. The beam from a laser pointer facing forward and a bit to your right will get curved toward the ship’s stern.
D. Light from stars in front of you will become infinitely blue-shifted.
E. Stars a bit to the right or left of the forward direction will have their apparent positions shifted dramatically toward the ship’s stern.
F. You will see none of these effects.
T. You will see all of these effects.
A. You won’t be able to see anything behind you.
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Faraday's Law: A flat circular loop having one turn and radius 5.0 cm is positioned with its plane perpendicular to a uniform 0.60-T magnetic field. The area of the loop is suddenly reduced to essentially zero in 0.50 ms. What emf is induced in the loop?
Fill in the blank(s) with the appropriate word(s).
A ball is thrown straight up with an initial velocity of 10 m/s. After 3 seconds its velocity will be
A. 29.4 m/s. B. 19.4 m/s. C. -19.4 m/s. D. 0 m/s. E. -29.4 m/s.
A shell-and-tube heat exchanger having one shell pass and four tube passes is shown schematically in the following sketch. The fluid in the tubes enters at 200°C and leaves at 100°C. The temperature of the fluid is 20°C entering the shell and is 90°C leaving the shell. The overall heat transfer coefficient based on the surface area of 12 m2 is 300 W/(m2 K). Calculate the heat transfer rate between the fluids.
GIVEN
• A shell-and-tube heat exchanger with one shell pass and four tube passes
• Temperature of fluid in tube
? Tt,in = 200°C
? Tt,out = 100°C
• Temperature of fluid in shell
? Ts,in = 20°C
? Ts,out = 90°C
• Overall heat transfer coefficient (U) = 300 W/(m2 K)
• Surface area (A) = 12 m2
FIND
• The heat transfer rate (q)
ASSUMPTIONS
• Steady state
• Exchanger geometry is countnerflow
SKETCH
Cloud chambers have been replaced by bubble chambers because
A) the radioactive clouds were too dangerous to work with. B) the density of fluids is greater than the density of vapors. C) bubble chambers tend to be larger and more expensive. D) gamma rays are visible in bubble chambers, but not in cloud chambers.