With molar quantity and temperature held constant, by what factor does the pressure of an ideal gas change when the volume is five times bigger?
a. 1/5
b. 1
c. 5
d. 25
a
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A longitudinal wave is represented by the equation z(z, t) = -2.0 cm sin(1,200 rad/s t - 20 
z). Another longitudinal wave is represented by the equation z(z, t) = +2.0 cm sin(1,200 rad/s t + 20
z). What is the equation that represents the superposition of the two waves?
A. z(z, t) = +4.0 cm cos(1,200 rad/s t) cos(20
z)
B. z(z, t) = +4.0 cm cos(1,200 rad/s t) sin(20z)
C. z(z, t) = +4.0 cm cos(1,200 rad/s t) cos(20z)
D. z(z, t) = -2.0 cm cos(1,200 rad/s t) sin(20z)
The main source of Earth's natural heat is
A) molten-hot lava. B) pressure on Earth's interior. C) radioactivity in Earth's interior. D) solar energy in the form of fossil fuels.
An 8.00-? resistor is connected to a battery with internal resistance of 0.200 ?. If the terminal voltage across the battery is 9.00 V, what is the battery's emf?
a. 8.78 ? b. 9.23 ? c. 0.225 ? d. 0.178 ?
If heat is flowing from a table to a block of ice moving across the table, which of the following must be true?
a. The table is rough and there is friction between the table and ice. b. The ice is cooler than the table. c. The ice is changing phase. d. All three are possible, but none is absolutely necessary.