Most stars are single stars like our Sun
Indicate whether the statement is true or false
FALSE
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When water boils, energy added to the water is counteracted by
A) decreased pressure in the water. B) static equilibrium. C) energy carried away by steam. D) energy of the whole system. E) none of the above
Water and ethanol can be separated by heating the ethanol until it boils away from the water. What type of change is this?
A) a physical change B) a chemical change C) a molecular change D) a decomposition E) none of the above
For a wave traveling in a string, by what factor would the tension need to be increased to triple the wave speed?
a. 2.7 c. 3.0 b. 9.0 d. 1.7
Each whole-number step on the Richter scale represents about how many times more energy release that the preceding whole-number step?
a. 10 b. 31 c. 18 d. 2