The oldest Earth rocks so far discovered and dated are _____
A) amethyst crystals
B) rhodonite crystals
C) zircon crystals
D) turquoise crystals
C
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Two charges, Q1 and Q2, are separated by a certain distance R. If the magnitudes of the charges are doubled and their separation is also doubled, then what happens to the electrical force between these two charges?
A) It is doubled. B) It changes by a factor of 3. C) reduced by a factor of . D) It is quadrupled. E) It remains the same.
What is a shock wave?
a. A wave caused by an earthquake. b. Any loud sound moving through the air. c. The edge of the pressure cone caused by superimposed waves from an object moving faster than sound. d. The point of the pressure cone caused by superimposed waves. e. The distance from the crest to the trough of a set of waves.
Power: If the voltage across a circuit of constant resistance is doubled, the power dissipated by that circuit will
A. be four times as large. B. be two times as large. C. decrease to one-half the original power. D. decrease to one-fourth the original power.
Which organisms are multicellular eukaryotes, with the majority being photosynthetic producers?
a. plants b. animals c. fungi d. bacteria e. archaea