A mineral that looks glassy is said to have a(n) ______________ luster
Fill in the blank(s) with correct word
vitreous
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Who proposed the geocentric view that was accepted and used for more than 18 centuries?
a. Copernicus b. Ptolemy c. Aristotle d. Kepler
Non-conservative forces convert mechanical energy into other forms of energy, or convert other forms of energy into mechanical energy
Indicate whether the statement is true or false
An astronaut weighs 99 N on the Moon, where the acceleration of gravity is 1.62 m/s2. How much does she weigh on Earth?
A) 99 N B) 61 N C) 16 N D) 600 N E) 440 N
Suggest why people once washed their hands with ashes
A) The ashes act as a base and reacts with skin oils to produce solutions of soap. B) The ashes act as an acid and reacts with the skin oils to produce soap. C) The oils on the skin act as a base and reacts with the ashes to produce soap. D) After being burnt in the fire, the acids and bases of the log are neutralized, making it a gentle material to use on the hands.