When uranium fissions, the fission fragments are
A)
each about half the mass of the uranium nucleus.
B)
about 2/5 and 3/5 the mass of the uranium nucleus.
C)
about 1/3 and 2/3 the mass of the uranium nucleus.
D)
about 1/4 and 3/4 the mass of the uranium nucleus.
E)
about 1/5 and 4/5 the mass of the uranium nucleus.
B
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A 1200 kg car travels at 25.0 m/s and collides head-on in a perfectly inelastic collision with a stationary 2400 kg truck. The kinetic energy lost in the collision is
A. 330,000 J. B. 250,000 J. C. 125,000 J. D. 95,000 J. E. 75,000 J.
When a light beam emerges from water into air, the average light speed
A) increases. B) decreases. C) remains the same.
Which statement best describes the greenhouse effect? a. infrared radiation escapes into space
b. ultraviolet radiation enters a planet's atmosphere producing a green haze c. visible radiation is trapped by the atmosphere. d. infrared radiation is trapped by the atmosphere. e. oxygen escapes from the atmosphere.
Beyond the formation of iron, nuclear energy can be produced only by
A) fusion of still heavier elements. B) ionization of the radioactive nuclei. C) fission of heavy nuclei back toward lighter ones. D) gravity. E) the dark force.