Concept explainers
Torricelli's Law Water in a tank will flow out of a small hole in the bottom faster when the tank is nearly full than when it is nearly empty. According to Torricelli’s Law, the height h(t) of water remaining at time t is a quadratic function of t.
A certain tank is filled with water and allowed to drain. The height of the water is measured at different times as shown in the table.
(a) Find the quadratic polynomial that best fits the data.
(b) Draw a graph of the polynomial from part (a) together with a
(c) Use your graph from part (b) to estimate how long it takes for the tank to drain completely.
Time (min) | Height (ft) |
0 | 5.0 |
4 | 3.1 |
8 | 1.9 |
12 | 0.8 |
16 | 0.2 |
(a)
To find: The quadratic polynomial that best fits the data.
Answer to Problem 6P
The quadratic polynomial that best fits the data is
Explanation of Solution
It is appropriate to use quadratic polynomial to model the given data, if there is single peak in the given data.
It is observed that the given data appears to have a peak. Therefore, it is appropriate to use quadratic polynomial (degree 2) as a model for the given data
By the use of graphing calculator, the best fit quadratic regression
Thus, the quadratic polynomial that best fits the data is
(b)
To draw: The graph of the quadratic polynomial from part (a) with the scatter plot of the data.
Explanation of Solution
Graph:
Consider the time in minutes as the x coordinates and the height in feet as the y coordinates.
From part (a), the quadratic polynomial obtained is
The graph of the quadratic polynomial with the scatter plot of the given data is shown below in Figure 1.
From Figure 1, the graph is an upward parabola.
(c)
To estimate: The time for the tank to drain completely.
Answer to Problem 6P
The time for the tank to drain completely is
Explanation of Solution
The tank drains completely when the height of water remaining in the tank is zero.
From Figure 1, it is observed that the value of y is 0 occurs when x is 18.68.
Therefore, the time for the tank to drain completely is
Chapter 3 Solutions
Precalculus: Mathematics for Calculus - 6th Edition
- Use the information to find and compare Δy and dy. (Round your answers to four decimal places.) y = x4 + 7 x = −3 Δx = dx = 0.01 Δy = dy =arrow_forward4. A car travels in a straight line for one hour. Its velocity, v, in miles per hour at six minute intervals is shown in the table. For each problem, approximate the distance the car traveled (in miles) using the given method, on the provided interval, and with the given number of rectangles or trapezoids, n. Time (min) 0 6 12 18|24|30|36|42|48|54|60 Speed (mph) 0 10 20 40 60 50 40 30 40 40 65 a.) Left Rectangles, [0, 30] n=5 b.) Right Rectangles, [24, 42] n=3 c.) Midpoint Rectangles, [24, 60] n=3 d.) Trapezoids, [0, 24] n=4arrow_forwardThe bracket BCD is hinged at C and attached to a control cable at B. Let F₁ = 275 N and F2 = 275 N. F1 B a=0.18 m C A 0.4 m -0.4 m- 0.24 m Determine the reaction at C. The reaction at C N Z F2 Darrow_forward
- The correct answer is C,i know that we need to use stokes theorem and parametrize the equations then write the equation F with respect to the curve but i cant seem to find a way to do it, the integral should be from 0 to 2pi but i might be wrongcould you show me the steps to get to 18piarrow_forwardA 10-ft boom is acted upon by the 810-lb force as shown in the figure. D 6 ft 6 ft E B 7 ft C 6 ft 4 ft W Determine the tension in each cable and the reaction at the ball-and-socket joint at A. The tension in cable BD is lb. The tension in cable BE is lb. The reaction at A is ( lb) i + Ib) j. (Include a minus sign if necessary.)arrow_forwardthe correct answer is A could you show me whyarrow_forward
- Good Day, Kindly assist me with this query.arrow_forwardon donne f(x) da fonction derive dhe do fonction fcsos calcule f'(x) orans chacun des Cas sulants: 3 1) f(x)=5x-11, 2- f (x) = ->³ 3-1(x) = x² 12x +π; 4-f(x)=- 5-f(x) = 33-4x6-609)=-3x²+ 7= f(x) = x + 1.8-f(x) = 4 s-f(x) = x++ X+1 -x-1 2 I 3x-4 девоarrow_forwardThe correct answer is Ccould you show me how to do it by finding a0 and and akas well as setting up the piecewise function and integratingarrow_forward
- T 1 7. Fill in the blanks to write the calculus problem that would result in the following integral (do not evaluate the interval). Draw a graph representing the problem. So π/2 2 2πxcosx dx Find the volume of the solid obtained when the region under the curve on the interval is rotated about the axis.arrow_forward38,189 5. Draw a detailed graph to and set up, but do not evaluate, an integral for the volume of the solid obtained by rotating the region bounded by the curve: y = cos²x_for_ |x| ≤ and the curve y y = about the line x = =플 2 80 F3 a FEB 9 2 7 0 MacBook Air 3 2 stv DGarrow_forwardFind f(x) and g(x) such that h(x) = (fog)(x) and g(x) = 3 - 5x. h(x) = (3 –5x)3 – 7(3 −5x)2 + 3(3 −5x) – 1 - - - f(x) = ☐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