Fusion reactors like the Tokomak shown here would be an ideal source of energy that do not suffer from the disadvantages of fission reactors. Why is nuclear fission much more practical as an energy source than nuclear fusion?
a. Because radioactive nuclei are available as a fuel for fission, but no fuel for nuclear fusion is available.
b. A chain reaction drives nuclear fission, but sustaining nuclear fusion is much more difficult.
c. Nuclear fusion has never been demonstrated.
d. The lower atomic masses of the fusion fuels limit their energy output.
e. The high temperatures needed for fusion make fusion reactors far too dangerous.
b
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An ideal fluid in a pipe of diameter 14. cm is moving at 6.0 m/s
(a) If the incompressible fluid density is 1.05 grams/cc, what is the flow rate in kg/s? (b) What is the speed of flow if the pipe narrows to 4.0 cm radius?
Two billiard balls having the same mass roll toward each other at the same speed. What is the net momentum of the two-ball system?
A) 0 kg?m/s B) 10 kg?m/s C) not enough information
Modern electroplaters can cover a surface area of 75.0 m2 with one troy ounce of gold (volume = 1.611 cm3). What is the thickness of the electroplated gold?
a. 2.15E–8 m b. 1.07E–8 m c. 1.43E–8 m d. 4.30E–8 m e. None of the above
The right-hand rule allows one to find a property of the interaction of a magnetic field with a charged particle. The right-hand rule applied to moving charges:
a. results in positive charges moving clockwise. b. results in negative charges moving clockwise. c. can be used for positive charges only. d. gives the direction of the force on a charge moving in a magnetic field.