Which of the following has not yet been proved practical?
a. Fusion reactor
b. Fusion bomb
c. Fission bomb
d. Fission reactor
a
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The water-ice particles forming Saturn's rings are frozen together into a thin sheet that rotates around Saturn like a solid body
Indicate whether the statement is true or false
A proton and a deuteron are moving with equal velocities perpendicular to a uniform magnetic field. A deuteron has the same charge as the proton but has twice its mass. The ratio of the magnetic force on the proton to that on the deuteron is:
a. 0.5. b. 1. c. 2. d. There is no magnetic force in this case.
Most of the detailed information about the planets in our solar system comes from
A) telescopic observations from Earth B) robotic spacecraft C) human visits D) meteorites
Which contributes more to the cost of your electric bill each month, a 1500-Watt hair dryer or a 600-Watt microwave oven?
a) hair dryer b) microwave oven c) both contribute equally d) depends upon what you cook in the oven e) depends upon how long each one is on