Physics 198 Lecture 36: Lecture 36

A 4.0-µF and a 15.0-µF capacitor are connected in series, and theseries arrangement is connected in parallel to a 20.0- uFcapacitor. How much capacitance would a single capacitor need toreplace the three capacitors?

a. 23 µF
b. 13 µF
c. 31 µF
d. 18 µF

A human body consists mainly out of water. One mole (mol) of water,which consist of
about 6·10^23 molecules, has a mass of 18 g. Assuming that themolecules of water in your body are closely packed together, make arough estimate of the size of a molecule.

two converging lenses are placed 35 cm apart. the focal lenght of the lens on the right is 23 cm and the focal length of the lens on the left is 18 cm. An object is placed to the left of the 15 cm focal-lenght lens. A final image from both lenses is inverted and located halfway between the two lenses. How far to the left of the 18 cm focal-length lens is the original object?