Concept explainers
Cooling Soup When a bowl of hot soup is left in a room, the soup eventually cools down to room temperature. The temperature T of the soup is a function of time t. The table below gives the temperature (in °F) of a bowl of soup t minutes after it was set on the table. Find the average rate of change of the temperature of the soup over the first 20 minutes and over the next 20 minutes. During which interval did the soup cool off more quickly?
t (min) | T (°F) |
0 | 200 |
5 | 172 |
10 | 150 |
15 | 133 |
20 | 119 |
25 | 108 |
30 | 100 |
35 | 94 |
40 | 89 |
50 | 81 |
60 | 77 |
90 | 72 |
120 | 70 |
150 | 70 |
To find: The average rate of change of temperature of soup over the first 20 minutes and over the next 20 minutes also during which interval the soup cool off more quickly.
Answer to Problem 29E
Therefore, the average rate of change of temperature of bowl of soup over the first 20 minutes is
Explanation of Solution
Given:
The given table is,
|
|
|
| |
0 | 200 | 35 | 94 | |
5 | 172 | 40 | 89 | |
10 | 150 | 50 | 81 | |
15 | 133 | 60 | 77 | |
20 | 119 | 920 | 72 | |
25 | 108 | 120 | 70 | |
30 | 100 | 150 | 70 |
Formula used:
Average rate of change of function
Calculation:
The table shows the temperature (in
Temperature of bowl at time 0 min is 200
Substitute 200 for
The average rate of change of temperature of bowl of soup over the first 20 minutes is
Substitute 119 for
The average rate of change of temperature of bowl of soup over the next 20 minutes is
Where,
Form a table to show the decrease in temperature during each interval of time in the given table.
|
|
|
|
|
| |
0-5 | 28 | 5.6 | 35-40 | 5 | 0.5 | |
5-10 | 22 | 4.4 | 40-50 | 8 | 0.8 | |
10-15 | 17 | 3.4 | 50-60 | 6 | 0.6 | |
15-20 | 14 | 2.8 | 60-90 | 5 | 0.166 | |
20-25 | 11 | 2.2 | 90-120 | 2 | 0.066 | |
25-30 | 8 | 1.6 | 120-150 | 0 | 0 | |
30-35 | 6 | 1.2 |
From the table it is clear that during first interval the soup cool off more quickly.
Therefore, the average rate of change of temperature of bowl of soup over the first 20 minutes is
Chapter 2 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
- 4 πT14 Sin (X) 3 Sin(2x) e dx 1716 S (sinx + cosx) dxarrow_forwardLet g(x) = f(t) dt, where f is the function whose graph is shown. 3 y f(t) MA t (a) At what values of x do the local maximum and minimum values of g occur? Xmin = Xmin = Xmax = Xmax = (smaller x-value) (larger x-value) (smaller x-value) (larger x-value) (b) Where does g attain its absolute maximum value? x = (c) On what interval is g concave downward? (Enter your answer using interval notation.)arrow_forward2. Graph the function f(x)=e* −1. Label three points on the graph (one should be the intercept) with corresponding ordered pairs (round to one decimal place) and label the asymptote with its equation. Write the domain and range of the function in interval notation. Make your graph big enough to see all important features. You may show the final graph only.arrow_forward
- ansewer both questions in a very detailed manner . thanks!arrow_forwardQuestion Considering the definition of f(x) below, find lim f(x). Select the correct answer below: -56 -44 ○ -35 ○ The limit does not exist. x+6 -2x² + 3x 2 if x-4 f(x) = -x2 -x-2 if -4x6 -x²+1 if x > 6arrow_forwardLet g(x) = f(t) dt, where f is the function whose graph is shown. y 5 f 20 30 t (a) Evaluate g(x) for x = 0, 5, 10, 15, 20, 25, and 30. g(0) = g(5) = g(10) = g(15) =| g(20) = g(25) = g(30) = (b) Estimate g(35). (Use the midpoint to get the most precise estimate.) g(35) = (c) Where does g have a maximum and a minimum value? minimum x= maximum x=arrow_forward
- Question Determine lim f(x) given the definition of f(x) below. (If the limit does not exist, enter DNE.) x+6+ -2x²+3x-2 f(x) -2x-1 if x-5 if -−5≤ x ≤ 6 3 if x 6arrow_forwardQuestion Given the following piecewise function, evaluate lim f(x). (If the limit does not exist, enter DNE.) x-3 Provide your answer below: x² + 3x 3 if x-3 f(x) -3 if -3x -2x²+2x-1 6 if x 6arrow_forwardQuestion Given the following piecewise function, evaluate lim f(x). x→2 Select the correct answer below: -73 -24 -9 -12 The limit does not exist. 2x f(x) = -2x²-1 if -2x2 3x+2 if x 2arrow_forward
- Question Given the following piecewise function, evaluate lim f(x). f(x) = x+1- -2x² - 2x 3x-2 2 x² +3 if x-2 if -2< x <1 if x 1 Select the correct answer below: ○ -4 ○ 1 ○ 4 The limit does not exist.arrow_forwardQuestion Given the following piecewise function, evaluate lim →1− f(x). Select the correct answer below: ○ 1 ○ 4 -4 The limit does not exist. -2x² - 2x x 1arrow_forward(4) (8 points) (a) (2 points) Write down a normal vector n for the plane P given by the equation x+2y+z+4=0. (b) (4 points) Find two vectors v, w in the plane P that are not parallel. (c) (2 points) Using your answers to part (b), write down a parametrization r: R² — R3 of the plane P.arrow_forward
- Calculus: Early TranscendentalsCalculusISBN:9781285741550Author:James StewartPublisher:Cengage LearningThomas' Calculus (14th Edition)CalculusISBN:9780134438986Author:Joel R. Hass, Christopher E. Heil, Maurice D. WeirPublisher:PEARSONCalculus: Early Transcendentals (3rd Edition)CalculusISBN:9780134763644Author:William L. Briggs, Lyle Cochran, Bernard Gillett, Eric SchulzPublisher:PEARSON
- Calculus: Early TranscendentalsCalculusISBN:9781319050740Author:Jon Rogawski, Colin Adams, Robert FranzosaPublisher:W. H. FreemanCalculus: Early Transcendental FunctionsCalculusISBN:9781337552516Author:Ron Larson, Bruce H. EdwardsPublisher:Cengage Learning