Questions to contemplate for test #2
Sections 16.1-16.5

1. How can you use Riemann sums to get a numerical approximation of the integral of a function of two variables? (You should be able to do this using either a table of values or a graph of level curves.)
   
   
2. Interpret the meaning of the integral of a function of two variables in terms of the (3-D) graph of z=f(x,y) and a region R in the x-y plane.
   
   
3. How are ``slices'' (i.e., cross-sections corresponding to x=constant or y=constant) related to iterated integrals?
   
   
4. In evaluating an iterated integral, which integration is performed first?
   
   
5. For an iterated double integral, which limit(s) can be functions of which variable(s)? What about for an iterated triple integral?
   
   
6. If you are integrating a function f(x,y) over a region R in the x-y plane, how do you determine the limits of integration? How do you do this in reverse (given the limits, determine the region)?
   
   
7. Consider the previous question, but now with polar coordinates.
   
   
8. Given an iterated integral in terms of x and y, how can you rewrite it as an iterated integral in polar coordinates? (Be sure to consider the region R, the infinitesimal area element dA, and the function f.)
   
   
9. Given an iterated integral in polar coordinates, how can you rewrite it as an iterated integral in rectangular coordinates (x and y)? (Be sure to consider the region R, the infinitesimal area element dA, and the function f.)
   
   
10. What do ``slices'' look like in polar coordinates? How are they useful in writing iterated integrals in polar coordinates?
    
    
11. Explain why integrals are useful for computing totals from given density information.
    
    
12. How can you determine the limits of integration for a triple integral, based on a graph of the three-dimensional region of integration?
    
    
13. What are cylindrical coordinates? When are they useful? Describe the graphs of surfaces corresponding to r=constant, θ =constant, and z=constant (in cylindrical coordinates).
    
    
14. What are spherical coordinates? When are they useful? Describe the graphs of surfaces corresponding to r=constant, θ =constant, and φ =constant (in spherical coordinates).
    
    
15. Given an iterated integral over a 3-D region written in Cartesian coordinates (x and y), how do you convert it to an integral in cylindrical coordinates? (Be sure to consider the region of integration W, the infinitesimal volume element dV, and the function f.)
    
    
16. Given an iterated integral over a 3-D region written in Carters Ian coordinates (x and y), how do you convert it to an integral in spherical coordinates? (Be sure to consider the region of integration W, the infinitesimal volume element dV, and the function f.)