Two capacitors give an equivalent capacitance of 9.42 pf when connected in parallel and an equivalent capacitance of 1.68 pf when connected in series. what is the capacitance of each capacitor?

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.