A sample of an ancient sedimentary rock contains slightly less of the isotope carbon-13 than found in inorganic material. One possible explanation for this is that
A) it was a meteorite that fell from the sky
B) some kind of radioactive decay occurred in it in the past
C) it used to be at the bottom of an ancient ocean
D) some kind of biological activity occurred in it in the past
D
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A kiloampere ? hour is a unit of:
A) current B) charge per time C) power D) charge E) energy
When 10 grams of hot water cool by 1°C, the amount of heat given off is
A) 41.9 calories. B) 41.9 Calories. C) 41.9 joules. D) more than 41.9 joules. E) none of the above
Of the outer planets, ________ has the smallest diameter.
A. Saturn B. Jupiter C. Neptune D. Uranus E. Pluto
A battery's "voltage" is
A) the amount of electrical current it produces. B) the amount of electrical resistance it can overcome. C) the amount of energy it gives to each coulomb of electrical charge. D) the amount of kinetic energy it gives to each electron. E) the amount of electrical charge it can send around an electrical circuit in every second.