The eyes and the respiratory tract are both protected against infections by _____.

When two or more capacitors are connected in series across a potential difference,  

Your patient has opacities in the stroma of their cornea.  The doctor wants a good photo for documentation purposes.  Of the slit lamp techniques below, which will you use?

A charge Q = -610 nC is uniformly distributed on a ring of 2.4-m radius. A point charge q = +480 nC is fixed at the center of the ring, as shown in the figure. An electron is projected from very far away toward the ring along the axis of the ring. This electron comes to a momentary halt at a point on the axis that is 5.0 m from the center of the ring. What is the initial speed of the electron? (mel = 9.11 × 10-31 kg) [vinit][vunits]

(BONUS 5pts) How much energy has been dissipated by this resistor since the switch was closed? How much energy has been dissipated by the entire circuit in this time? lone resistor: [RCenergy1][RCeunits1] total circuit: [RCenergyT][RCeunitsT]

Acquired immunity involves both a humoral immune response and a cell-mediated immune response.    Match the items into the appropriate category depending on whether they are involved in the humoral response, the cell-mediated response, or both the humoral and the cell-mediated responses.

Which of the following statements about inductors are correct? There may be more than one correct choice.  

The article that  you were to read on reading VF printouts states that when interpreting VF printouts you should always look at this first:

Thirteen resistors are connected across points A and B as shown in the figure. If all the resistors are accurate to 2 significant figures, what is the equivalent resistance between points A and B?  [HINT: For your first redraw, it will help a lot to combine all of the resistors that you can see are in series. Worry about reducing all of the series resistors to equivalents first.] [eqR][Runits] (You can just type the name of the units.)

The liver and pancreas add their secretions to the partially digested food produced in the stomach, in the _____ of the small intestine.