Alcohol and Driving The concentration of alcohol in a person's bloodstream is measurable. Suppose that the relative risk R of having an accident while driving a car can be modeled by an equation of the form, R = e k x where x is the percent concentration of alcohol in the bloodstream and k is a constant. a. Suppose that a concentration of alcohol in the bloodstream of 0.03 percent results in a relative risk of an accident of 1.4 . Find the constant k in the equation. b. Using this value of k , what is the relative risk if the concentration is 0.17 percent? c. Using the same value of k , what concentration of alcohol corresponds to a relative risk of 100? d. If the law asserts that anyone with a relative risk of having an accident of 5 or more should not have driving privileges, at what concentration of alcohol in the bloodstream should a driver be arrested and charged with a DU I? e. Compare this situation with that of Example 10. If you were a lawmaker, which situation would you support? Give your reasons.
Alcohol and Driving The concentration of alcohol in a person's bloodstream is measurable. Suppose that the relative risk R of having an accident while driving a car can be modeled by an equation of the form, R = e k x where x is the percent concentration of alcohol in the bloodstream and k is a constant. a. Suppose that a concentration of alcohol in the bloodstream of 0.03 percent results in a relative risk of an accident of 1.4 . Find the constant k in the equation. b. Using this value of k , what is the relative risk if the concentration is 0.17 percent? c. Using the same value of k , what concentration of alcohol corresponds to a relative risk of 100? d. If the law asserts that anyone with a relative risk of having an accident of 5 or more should not have driving privileges, at what concentration of alcohol in the bloodstream should a driver be arrested and charged with a DU I? e. Compare this situation with that of Example 10. If you were a lawmaker, which situation would you support? Give your reasons.
Alcohol and Driving The concentration of alcohol in a person's bloodstream is measurable. Suppose that the relative risk
of having an accident while driving a car can be modeled by an equation of the form,
where
is the percent concentration of alcohol in the bloodstream and
is a constant.
a. Suppose that a concentration of alcohol in the bloodstream of
percent results in a relative risk of an accident of
. Find the constant
in the equation.
b. Using this value of
, what is the relative risk if the concentration is
percent?
c. Using the same value of
, what concentration of alcohol corresponds to a relative risk of 100?
d. If the law asserts that anyone with a relative risk of having an accident of 5 or more should not have driving privileges, at what concentration of alcohol in the bloodstream should a driver be arrested and charged with a DU I?
e. Compare this situation with that of Example 10. If you were a lawmaker, which situation would you support? Give your reasons.
1. Show that the vector field
F(x, y, z)
=
(2x sin ye³)ix² cos yj + (3xe³ +5)k
satisfies the necessary conditions for a conservative vector field, and find a potential function for
F.
1. Newton's Law of Gravitation (an example of an inverse square law) states that the magnitude
of the gravitational force between two objects with masses m and M is
|F|
mMG
|r|2
where r is the distance between the objects, and G is the gravitational constant. Assume that the
object with mass M is located at the origin in R³. Then, the gravitational force field acting on
the object at the point r = (x, y, z) is given by
F(x, y, z) =
mMG
r3
r.
mMG
mMG
Show that the scalar vector field f(x, y, z) =
=
is a potential function for
r
√√x² + y² .
Fi.e. show that F = Vf.
Remark: f is the negative of the physical potential energy, because F = -V(-ƒ).
2. Suppose f(x) = 3x² - 5x. Show all your work for the problems below.
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