Use Newton’s Law of Cooling, T = C + ( T 0 − C ) e k t , to solve exercise 47-50. A bottle of juice initially has a temperature of 70°F. It is left to cool in a refrigerator that has a temperature of 45°F. After 10 minutes, the temperature of the juice is 55°F. a. Use Newton’s Law of Cooling to find a model for the temperature of the juice, T, after t minutes. b. What is the temperature of the juice after 15 minutes? c. When will the temperature of the juice be 50°F?
Use Newton’s Law of Cooling, T = C + ( T 0 − C ) e k t , to solve exercise 47-50. A bottle of juice initially has a temperature of 70°F. It is left to cool in a refrigerator that has a temperature of 45°F. After 10 minutes, the temperature of the juice is 55°F. a. Use Newton’s Law of Cooling to find a model for the temperature of the juice, T, after t minutes. b. What is the temperature of the juice after 15 minutes? c. When will the temperature of the juice be 50°F?
Solution Summary: The author calculates the temperature of a heated object, T, after t minutes by using Newton's law of Cooling.
Use Newton’s Law of Cooling,
T
=
C
+
(
T
0
−
C
)
e
k
t
, to solve exercise 47-50.
A bottle of juice initially has a temperature of 70°F. It is left to cool in a refrigerator that has a temperature of 45°F. After 10 minutes, the temperature of the juice is 55°F.
a. Use Newton’s Law of Cooling to find a model for the temperature of the juice, T, after t minutes.
b. What is the temperature of the juice after 15 minutes?
c. When will the temperature of the juice be 50°F?
Consider the function f(x) = x²-1.
(a) Find the instantaneous rate of change of f(x) at x=1 using the definition of the derivative.
Show all your steps clearly.
(b) Sketch the graph of f(x) around x = 1. Draw the secant line passing through the points on the
graph where x 1 and x->
1+h (for a small positive value of h, illustrate conceptually). Then,
draw the tangent line to the graph at x=1. Explain how the slope of the tangent line relates to the
value you found in part (a).
(c) In a few sentences, explain what the instantaneous rate of change of f(x) at x = 1 represents in
the context of the graph of f(x). How does the rate of change of this function vary at different
points?
1. The graph of ƒ is given. Use the graph to evaluate each of the following values. If a value does not exist,
state that fact.
и
(a) f'(-5)
(b) f'(-3)
(c) f'(0)
(d) f'(5)
2. Find an equation of the tangent line to the graph of y = g(x) at x = 5 if g(5) = −3 and g'(5)
=
4.
-
3. If an equation of the tangent line to the graph of y = f(x) at the point where x 2 is y = 4x — 5, find ƒ(2)
and f'(2).
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