Shapley found the distance to the center of the galaxy by studying the distance to open clusters
a. True
b. False
Indicate whether the statement is true or false
False
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A 100.0 kg mass is blown apart into a 95.00 kg piece and a 5.000 kg piece. After the blast, the two masses are moving apart with a relative velocity of 100.0 m/s. The kinetic energy of the 95.00 kg mass after the explosion is
A. 1,190 J. B. 8,600 J. C. 18,750 J. D. 22,560 J. E. 23,750 J.
Which will melt more ice when placed on its surface, a kilogram of wood or a kilogram of iron of the same high temperature?
A) 1 kg of wood. B) 1 kg of iron. C) both the same D) neither of these
Gale Crater is the site of exploration for which Mars rover?
A) Spirit B) Opportunity C) Curiosity D) Sojourner
Two experimental runs are performed to determine the calorimetric properties of an alcohol which has a melting point of -10° C
In the first run, a 200-g cube of frozen alcohol, at the melting point, is added to 300 g of water at 20°C in a styrofoam container. When thermal equilibrium is reached, the alcohol-water solution is at a temperature of 5°C. In the second run, an identical cube of alcohol is added to 500 g of water at 20°C and the temperature at thermal equilibrium is 10°C. The specific heat capacity of water is 4190 J/kg ? K. Assume no heat is exchanged with the styrofoam container and the surroundings. What is the specific heat capacity of the alcohol? A) 1700 J/kg ? K B) 1900 J/kg ? K C) 2100 J/kg ? K D) 2300 J/kg ? K E) 2500 J/kg ? K