If a heat engine has an efficiency of 30% and its power output is 600 W, what is the rate of heat input from the combustion phase?
a. 1800 W
c. 2000 W
b. 2400 W
d. 3000 W
C
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Currents in Earth's molten iron core create the planet's magnetic field. These currents are probably caused by
A. radioactivity and convection. B. rotational motion and radioactivity. C. rotational motion and convection. D. rifting and subduction.
If 1.00 mol of oxygen is heated at constant pressure of 1.00 atm from 
to 
What is the work done by the gas during this expansion?
A. 159 J B. 125 J C. 102 J D. 172 J
The largest asteroid, and probably the only one to be a spherical "world," is
A) Ceres. B) Ida. C) Vesta. D) Gaspra. E) Eros.
If the applied electric field has a frequency of 1016 Hz, the type of polarization present in a dielectric is:
(a) Electron current flow (b) Electronic (c) Ionic (d) Orientational