About how long does it take the Moon to orbit Earth?
Answer: 29 days
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Energy in Nuclear Reactions: Two deuterium nuclei, 
H, fuse to produce a tritium nucleus, 
H, plus an ordinary hydrogen nucleus, 
H. A neutral deuterium atom has a mass of 2.014102 u; a neutral tritium atom has a mass of 3.016050 u; a neutral hydrogen atom has a mass of 1.007825 u; a neutron has a mass of 1.008665 u; and a proton has a mass of 1.007277 u. How much energy is released in this fusion process? (1 u = 931.5 MeV/c2)
A. 3.03 MeV B. 3.53 MeV C. 4.03 MeV D. 4.53 MeV E. 6.58 MeV
Once a current has been established in a superconducting material, how much energy is needed to keep it going?
a. None. b. Energy must be continuously provided as the same rate that was used to establish the current in the first place. c. Energy must continue to be provided at a lower rate than initially. d. Superconductors remove energy from the environment to maintain the current. e. The power needed to maintain the current is half that to establish it initially.
A particle (mass = 2.0 mg, charge = ?6.0 ?C) moves in the positive direction along the x axis with a velocity of 3.0 km/s. It enters a magnetic field of (
) mT. What is the acceleration of the particle?
A.
? 27
) m/s2B.
+ 27
) m/s2C.
+ 18
) m/s2D.
? 18
) m/s2E.
? 27
) m/s2One horsepower is the same as
a) 550 foot-pounds/second. b) 746 watts. c) 746 newton-meters/second. d) all of the above.