The percentage of 235U, as a fraction of the total uranium content, present in natural uranium is closest to
A) 5 percent. B) 50 percent. C) 1 percent. D) 20 percent. E) 99 percent.
C
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The principle of conservation of energy states that if the total mechanical energy is a constant then
A. the momentum is always a constant B. no work is done on a system by any nonconservative forces C. no work is done on a system by any forces D. work is done on a system in order to conserve energy
A flask of water rests on a scale. If you dip your finger into the water, without touching the flask, the reading on the scale will
A) decrease. B) stay the same. C) increase. D) behave unpredictably.
The four plausible routes by which terrorists might use nuclear devices do not include
A) acquiring radioactive material and using conventional explosive to disperse this material. B) sabotaging a nuclear power plant. C) enriching natural uranium to weapons grade uranium, and building a nuclear weapon from it. D) obtaining weapons-grade uranium or plutonium and building a nuclear weapon from it. E) seizing an intact nuclear weapon.
A refracting astronomical telescope has objective and eyepiece lenses of focal lengths 38 cm and 0.40 cm, respectively. What is the angular magnification of this instrument?
a. 95 c. 27 b. 50 d. 19.6