Radon is
A) the chemically active element in asbestos.
B) a type of electromagnetic radiation that is produced by the sun and partially penetrates Earth's atmosphere.
C) the main component in the radioactive fallout from nuclear weapons and nuclear power plant accidents.
D) a radioactive gas produced by the rocks and soil that can filter into houses.
E) the radioactive substance that will probably be used to irradiate and sterilize food.
D
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Thermal energy is measured in
A) calories. B) Calories. C) joules. D) any or all of the above for special cases
A 6.0-kg object moving 2.0 m/s in the positive x direction has a one-dimensional elastic collision with a 4.0-kg object moving 3.0 m/s in the opposite direction. What is the total kinetic energy of the two-mass system after the collision?
a. 30 J b. 62 J c. 20 J d. 44 J e. 24 J
You would be richest if your hunk of gold weighed 10 newtons
A) on the moon. B) on Earth. C) Actually it wouldn't make any difference.
A number of epochs is called a(n)
a. eon. b. period. c. millennia. d. era.