Jonas performed an experiment for his science fair project. He learned that rinsing lettuce in vinegar kills more bacteria than rinsing with water or with a popular commercial product. As a follow-up to his project, he wants to determine the percentage of bacteria killed by rinsing with a diluted solution of vinegar. a. How much water and how much vinegar should be mixed to produce 10 cups of a mixture that is 40 % vinegar? b. How much pure vinegar and how much 40 % vinegar solution should be mixed to produce 10 cups of a mixture that is 60 % vinegar?
Jonas performed an experiment for his science fair project. He learned that rinsing lettuce in vinegar kills more bacteria than rinsing with water or with a popular commercial product. As a follow-up to his project, he wants to determine the percentage of bacteria killed by rinsing with a diluted solution of vinegar. a. How much water and how much vinegar should be mixed to produce 10 cups of a mixture that is 40 % vinegar? b. How much pure vinegar and how much 40 % vinegar solution should be mixed to produce 10 cups of a mixture that is 60 % vinegar?
Jonas performed an experiment for his science fair project. He learned that rinsing lettuce in vinegar kills more bacteria than rinsing with water or with a popular commercial product. As a follow-up to his project, he wants to determine the percentage of bacteria killed by rinsing with a diluted solution of vinegar.
a. How much water and how much vinegar should be mixed to produce
10
cups of a mixture that is
40
%
vinegar?
b. How much pure vinegar and how much
40
%
vinegar solution should be mixed to produce
10
cups of a mixture that is
60
%
vinegar?
(1) (8 points) Let c(t) = (et, et sint, et cost). Reparametrize c as a unit speed curve
starting from the point (1,0,1).
(9) (16 points) Let
F(x, y, z) = (x² + y − 4)i + 3xyj + (2x2 +z²)k
=
-
= (x²+y4,3xy, 2x2 + 2²).
(a) (4 points) Calculate the divergence and curl of F.
(b) (6 points) Find the flux of V x F across the surface S given by x² + y²+2² =
16, z ≥ 0.
(c) (6 points) Find the flux of F across the boundary of the unit cube E = [0,1] ×
[0,1] x [0,1].
(8) (12 points)
(a) (8 points) Let C be the circle x² + y² = 4. Let
F(x, y) = (2y + e²)i + (x + sin(y²))j.
Evaluate the line integral
JF.
F.ds.
Hint: First calculate V x F.
(b) (4 points) Let S be the surface r² + y² + z² = 4, z ≤0. Calculate the flux
integral
√(V × F)
F).dS.
Justify your answer.
College Algebra with Modeling & Visualization (5th Edition)
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