The purity of an alloy is given by the _____________.
Fill in the blank(s) with the appropriate word(s).
chemical composition
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The kilogram is currently defined as
A) the mass of a platinum-iridium cylinder kept in Sévres, France. B) the weight of a platinum-iridium cylinder as measured on the Earth's moon. C) the mass of 5.9786332 × 1026 protons. D) the mass of one liter of pure water, free of air, at standard temperature and pressure. E) the mass of a cube of pure water, free of air, 10 cm on each side, at standard temperature and pressure.
How does a 12-month lunar calendar differ from our 12-month solar calendar?
A) It has about 11 fewer days. B) It does not have seasons. C) Its new year always occurs in February instead of on January 1. D) It uses a 23-hour rather than a 24-hour day.
A heat pump uses 100 J of work output heat at some temperature. If the heat pump withdraws 60 J of heat from some lower temperature, then what is the coefficient of performance for the heat pump?
A. 1.6 B. 2.0 C. 2.4 D. 2.8
In the development of a terrestrial planet, the stage of ___________ when dense material settled to the core and less dense to the outer parts
a. differentiation b. cratering c. glaciation d. accretion e. flooding