A thermodynamic engine receives 7000 J of energy and loses 3000 J in each cycle. What is the efficiency of this engine?
A) 57%
B) 30%
C) 70%
D) 43%
A
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The highest peak on Venus is called:
A) Shif. B) Gula. C) Cleopatra. D) Maxwell. E) Lakshmi.
Air expands adiabatically (no heat in, no heat out) from T = 300 K and P = 100 atm to a final pressure of 1 atm. Treat the gas as ideal with ? = 1.4, and determine the final temperature. Compare your result to the boiling points of nitrogen (77.4 K) and oxygen (90.2 K). Could this method result in the liquification of air?
If you were to travel parallel to an infinitely long straight wire with current I at the same velocity as the electrons in the wire at a distance a from the wire, the magnitude of the magnetic field (according to your measuring instruments) would be
A.
B.
.C.
.D.
.E.
.Which (if any) actually is coolest?
A. The aluminum cylinder B. The wooden block C. The Styrofoam cup D. All are the same.