How much work is required to move a 1 nC charge from an electric potential of 0 V to a potential of 18V? a) 56 µJ
b) No work is required by an external force because this is the natural movement of the charge.
c) 18 J
d) 56 MJ
e) 18GJ
f) 18 nJ

Explain why the aperture of the spherical mirror should be small compared to the radius of curvature of the mirror.

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

The pressure, volume, and temperature of a mole of an ideal gas are related by the equation pv = 8.31t, where p is measured in kilopascals, v in liters, and t in kelvins. use differentials to find the approximate change in the pressure if the volume increases from 14 l to 14.6 l and the temperature decreases from 375 k to 370 k. (round the answer to two decimal places.)