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
Indicate whether the statement is true or false
TRUE
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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
The solar neutrinos observed on Earth come from the hot spots in the corona
Indicate whether the statement is true or false
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.