The names of the moons of Mars are ______________ and ______________
Fill in the blank(s) with correct word
Phobos; Deimos
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Radioactive Decay: One material used in nuclear bombs is 239Pu, with a half-life of 24,000 years. How long must we wait for a buried stockpile of this substance to decay to 1/1000 of its original activity?
A. 1,200,000 years B. 240,000 years C. 150,000 years D. 82,000 years E. 1500 years
An ice cube with a small solid steel sphere frozen inside floats in a glass of water filled to the brim. What happens to the level of water in the glass as a result of the ice melting?
a. It goes up, overflowing. b. It stays the same. c. It goes down. d. It depends on air pressure, thus the answer is indeterminate.
The common name for NH3 is ______________
Fill in the blank(s) with correct word
A person spearfishing from a boat sees a fish located 3 m from the boat at an apparent depth of 1 m. To spear the fish, the person should aim
1.at the image of the fish. 2.above the image of the fish. 3.below the image of the fish.