Assume a gram of a substance marketed as "Pure Energy" is annihilated by a gram of a second substance "Anti-Pure Energy." How long would the energy released power a city which uses 109 watts of power?
a. 40 hrs
b. 25 hrs
c. 50 hrs
d. 65 hrs
e. 50000 hrs
c
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An astronaut measures her mass by means of a device consisting of a chair attached to a large spring. The period of oscillation she undergoes when set into motion is used to determine her mass. If the spring constant is 1250 N/m and 27 seconds is required for her to undergo 10 full oscillations what is the mass of the astronaut and chair?
A. 231 kg B. 537 kg C. 85.5 kg D. 171 kg
Which element is the dead end for cores of the most massive stars?
A) lead B) oxygen C) uranium D) hydrogen E) iron
In a nuclear accident such as occurred at Chernobyl, the long-term biological damage is caused by
A) nuclear fusion occurring within the biological cells. B) the thermal energy produced by radioactive decay within biological cells. C) alpha, beta, and gamma particles passing through biological cells. D) nuclear fission occurring within the biological cells. E) the high energy vibrations of the water molecule that are caused by radioactive isotopes.
The greatest red shifts are observed for those galaxies that are
A. near our galactic equator. B. the brightest. C. nearest our galaxy. D. at the greatest distance from us.