An ideal gas at pressure, volume, and temperature, P0, V0, and T0, respectively, is heated to point A, allowed to expand to point B also at A’s temperature 2T0, and then returned to the original condition. The internal energy decreases by 3P0V0/2 going from point B to point
T0. In going around this cycle once, which quantity equals zero?
a.
the net change in internal energy of the gas
b.
the net work done by the gas
c.
the net heat added to the gas
d.
All three are zero.
a
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An ideal transformer consists of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?
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(A) 38 MPa
(B) 45 MPa
(C) 50 MPa
(D) 59 MPa
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a. extrusive b. intrusive c. superior d. inferior