Radioactive Decay A sample of radioactive material decays over time (measured in hours) with decay constant .2 . The graph of the exponential function y = P ( t ) in Fig.7 gives the number of grams remaining after t hour [Hint: In parts (c) and (d) use the differential equation satisfied by P ( t ) .] a. How much was remaining after 1 hour? b. Approximate the half-life of the material. c. How fast was the sample decaying after 6 hours? d. When was the sample decaying at the rate of . 4 grams per hour?
Radioactive Decay A sample of radioactive material decays over time (measured in hours) with decay constant .2 . The graph of the exponential function y = P ( t ) in Fig.7 gives the number of grams remaining after t hour [Hint: In parts (c) and (d) use the differential equation satisfied by P ( t ) .] a. How much was remaining after 1 hour? b. Approximate the half-life of the material. c. How fast was the sample decaying after 6 hours? d. When was the sample decaying at the rate of . 4 grams per hour?
Solution Summary: The author calculates the remaining sample of a radioactive material after 1 hour. The graph of the exponential function y=P(t) gives the number of grams remaining.
Radioactive Decay A sample of radioactive material decays over time (measured in hours) with decay constant
.2
. The graph of the exponential function
y
=
P
(
t
)
in Fig.7 gives the number of grams remaining after
t
hour [Hint: In parts (c) and (d) use the differential equation satisfied by
P
(
t
)
.]
a. How much was remaining after
1
hour?
b. Approximate the half-life of the material.
c. How fast was the sample decaying after
6
hours?
d. When was the sample decaying at the rate of
.
4
grams per hour?
Let f be a function whose graph consists of 5 line segments and a semicircle as shown in the figure below.
Let g(x) = √ƒƒ(t) dt .
0
3
2
-2
2
4
5
6
7
8
9
10
11
12
13
14
15
1. g(0) =
2. g(2) =
3. g(4) =
4. g(6) =
5. g'(3) =
6. g'(13)=
The expression 3 | (3+1/+1)
of the following integrals?
A
Ов
E
+
+
+ +
18
3+1+1
3++1
3++1
(A) √2×14 dx
x+1
(C) 1½-½√ √ ² ( 14 ) d x
(B) √31dx
(D) So 3+x
-dx
is a Riemann sum approximation of which
5
(E) 1½√√3dx
2x+1
2. Suppose the population of Wakanda t years after 2000 is given by the equation
f(t) = 45000(1.006). If this trend continues, in what year will the population reach 50,000
people? Show all your work, round your answer to two decimal places, and include units. (4
points)
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