Entropy: When water at 0°C freezes, the entropy of the water
A. increases.
B. decreases.
C. remains constant.
D. could either increase or decrease; it depends on other factors.
Answer: B
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A string with a mass per length of 2.00 gm/m is stretched with a force of 120 N between two points that are 0.400 m apart. The fundamental frequency of the stretched string is in tune with the frequency of the second mode of an organ pipe filled with air and open at both ends. The velocity of sound in air at 0
is 331 m/s. If the temperature of the air decreases by 20
then what is the length of the organ pipe?
A. 75.0 cm B. 100 cm C. 125 cm D. 150 cm E. 175 cm
A series RLC circuit has an impedance of 120 ? and a resistance of 64 ?. What average power is delivered to this circuit when Vrms = 90 volts?
A. 36 W B. 100 W C. 192 W D. 360 W E. 12 W
If you were in a spaceship in outer space and accelerating at 0.5 g, how heavy would you feel?
A) 1.5 times your normal weight B) Your normal weight C) Weightless D) Half your normal weight E) The answer depends on how fast your spaceship is moving.
How does energy relate to the way that streams meander?
What will be an ideal response?