When 0.50 kg of water at 0°C freezes, what is the change in entropy of the water? The latent heat of fusion of water is 33,400 J/kg
A) 0 J/K B) -17,000 J/K C) -610 J/K D) 17,000 J/K E) 610 J/K
C
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In neon, the 20.80-eV level can undergo lasing action to the 17.43-eV level. What is the energy of the resulting photons?
a. 20.80 eV b. 17.43 eV c. 38.23 eV d. 3.370 eV e. 1.685 eV
An organ pipe open at both ends is 1.5 m long. A second organ pipe that is closed at one end and open at the other is 0.75 m long. The speed of sound in the room is 330 m/s. Which of the following sets of frequencies consists of frequencies which can be produced by both pipes?
a. 110 Hz, 220 Hz, 330 Hz b. 220 Hz, 440 Hz, 660 Hz c. 110 Hz, 330 Hz, 550 Hz d. 330 Hz, 440 Hz, 550 Hz e. 220 Hz, 660 Hz, 1 100 Hz
Solids that are good conductors of heat tend also to be good conductors of electricity
Indicate whether the statement is true or false
You can safely stand on the overhanging end of a heavy plank that rests on a table. How much overhang depends on your mass and the plank's mass
If you can stand on the end of a plank that overhangs the edge of the supporting table 1/4 its total length, how massive is the plank compared to your mass? A) 1/2 B) the same C) 1 and 1/2 times D) twice E) 4 times