Express the number 13.5 gigameters in meters without using scientific notation
A) 135,000 m
B) 135,000,000 m
C) 135,000,000,000 m
D) 13,500,000,000 m
D
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A cube at 100.0°C radiates heat at a rate of 80.0 J/s. If the length of each side is cut in half, the rate at which it will now radiate is closest to
A) 56.6 J/s. B) 40.0 J/s. C) 28.3 J/s. D) 20.0 J/s. E) 10.0 J/s.
Every second at Niagara Falls, some 5 000 m3 of water falls a distance of 50 m. What is the increase in entropy per second due to the falling water? (Assume a 20°C environment)
A blacksmith drops a 550 °F piece of iron into a vat of 75 °F water in order to cool it to 100 °F. How many kilograms of water are needed per kilogram of iron? Assume all the thermal energy from the iron is transferred to the water and none of the water evaporates. The specific heats of water and iron are 4186 J/kg/°C and 448 J/kg/°C, respectively
a. 9.3 kg b. 0.78 kg c. 0.52 kg d. 1.9 kg
In the Bohr model of the atom, the orbits where electrons move slowest:
a. have the least radius. c. have the least angular momentum. b. have the highest energy. d. have the lowest energy.