A 2-mol ideal gas system undergoes an adiabatic process where it expands and does 24 J of work on its environment. What is its change in internal energy?
a. ?24 J
b. ?12 J
c. zero
d. +24 J
e. +12 J
a
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Which statement regarding the mix of state revenues is FALSE?
a. The 50 states combined had over $1.6 trillion annual revenue in 2011.
b. Over 70 percent of all stategenerated (or "own source") revenues come from taxation.
c. Most revenue from direct charges for public services is in the form of tuition for higher education.
d. With few exceptions, states generate nearly all of their tax revenues from the general sales tax.
What mechanism is most responsible for generating the internal heat of Io that drives its volcanic activity?
A) bombardment B) radioactive decay C) accretion D) tidal heating E) differentiation
Antiquity's greatest observer of stars was named
a. Hipparchus. b. Eratosthenes. c. Aristotle. d. Imhotep.
An LRC circuit has R = 15.0 ?, L = 25.0 mH, and C = 30.0 ?F. The circuit is connected to a 120 V (rms) source with frequency 200 Hz
(a) What is the impedance of the circuit? (b) What is the rms current in the circuit? (c) What is the rms voltage across the resistor? (d) What is the rms voltage across the inductor? (e) What is the rms voltage across the capacitor? (f) If the current in the circuit is given by I = I0 sin ?t, the voltage is given by