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Question 3: By using the indicated number of slices, calculate the approximate volume of the solid to 8 decimal places and record your results in the table below. The result for n - 4 is recorded, and the result for n 100 is given as well. The file in the Projects folder gives explicit instructions to set up the worksheet for n -4, and to check that you understand the procedure, make sure that your answer for n -100 matches the one given here. 7.17289416 10 50 100 5.91163962 500 1000 You should have computed that to 8 decimal places, the eract volume is 5.86430628 cubic units. Do the numbers in your table get closer to this as n increases? In this approximation step, we could find a formula that gives the approximate volume of the solid in terms of n. To do this, we would need to compute the volume Δνί of the k-th disk: We then would have to add the volumes of all of these together. Letting V denote the actual volume of the solid, we could write:
The method of Slice, Approximate, Integrate can be used to compute various geometric quantities - such as areas, volumes, and lengths - but it is also an important technique used in many physical applications as well. While the nature of the problems may be different; the method used to solve them is not Suppose a spring has a spring constant3 k 10 N/m. Let - 0 be the equilibrium position of the spring. Question 1: Set up and evaluate an integral that gives the total amount of work required to stretch the spring from z = 0 to 1-4. The eract work required is: This formula for the work is actually obtained by the Slice, Approximate, Integrate procedure! To see this, we first recall some results from physics: Work for students comfortable with physics If you are comfortable with physics, you may think of work as follows. Under the assumptions: 1. The force F required to move a particle a distance d is constant. 2. The force F is in the direction of motion (which it always will be for us at this juncture of the course The work required to move a particle d units is given by: In the case of a spring, the foree required to stretch the spring r meters from its equi- librium position is given by F(a) kr, which is not constant The spring constant measures how difficult it is to stretch or compress the spring; the larger the constant, the more force is required to displace the spring from its equilibrium position!
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