The observed composition of ordinary matter in the universe—roughly 75 percent hydrogen and 25 percent helium by mass—closely matches theoretical predictions based on the Big Bang model
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TRUE
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The solar neutrinos observed on Earth come from the hot spots in the corona
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A 10-kg rock and a 20-kg rock are dropped at the same time and there is no air. If the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock?
A) 4a B) 2a C) a D) a/2 E) a/4
Take a cup of water, add sugar, and stir. If the resulting solution no longer contains sugar crystals, the solution is said to be
a. an unsaturated solution. b. a saturated solution. c. a heterogeneous solution. d. none of these.
Thermodynamic Devices: A refrigerator has a coefficient of performance equal to 4.2. How much work must be done on the operating gas in the refrigerator in order to remove 250 J of heat from the interior compartment?
A. 60 J B. 120 J C. 250 J D. 480 J E. 1050 J