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1. Let σ be the ruled surface generated by the binormals b of a unit-speed curve γ:
σ(u, v) = γ(u) + vb(u).
Show that the first fundamental form of σ is
(1 + v2τ 2) du2 + dv2,
where τ is the torsion of γ.
2. Let f be a smooth function and let
σ(u, v) = (u cos v, u sin v, f(u))
be the surface obtained by rotating the curve z = f(x) in the xz-plane around
the z-axis.
(i) Find all functions f for which σ is conformal.
(ii) Find all functions f for which the surface patch σ.
Two rainstorms occurred in one week in a certain area. In the first storm 40 ml, of rain fell per hour, and in the second storm, 25 ml of rain fell per hour. Rain lasted for a total of 55 hours, resulting in a total rainfall of 1975 ml . How long ..
Important information about Counting and probability, Find the number of possible combinations of picking 2 items out of 6.
A new bone study is being planned that will measure the biomarker TRAP described in Exercise 6.17. Using the value of σ given there, 6.5 U/l, ?nd the sample size required to provide an estimate of the mean TRAP with a margin of error of 1.5 U/l fo..
The theoretical probability of undesirable side effects resulting from taking Grebex is 1 in 12. If 600 people take Grebex to lower their blood pressure, how many will encounter undesirable side effects?
If the outside of a picture frame measures 9 in by 15 in. of the picture shows. Find the thickness of the frame?
a statistical analysis of 1000 long-distance telephone calls made from the headquarters of the bricks and clicks
At a one percent level of significance, test to see if the mean of the population is at least twelve ounces. Write your conclusion?
Two opposite vertices of a square are P(3, 2) and Q(-5, -10). Find the length of:
A restaurant sells ice cream and frozen yogurt. The restaurant makes one order for ice cream and frozen yogurt per week, and the store has enough freezer space for 110 gallons of both products
Always look for a common factor. If there is one, factor out the largest common factor. Use an example to explain how to identify and factor out the largest common factor. (minimum 50 words).
find the length and width of a rectangle with the area of 72yd^2
If a goat is tied on a 50 foot lead to a corner on the outside of a rectangular barn and the barn is 20 feet by 20 feet and the goat can not get into the barn nor is the barn a grazing area
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