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Calculus (MindTap Course List)

8th Edition
James Stewart
ISBN: 9781285740621

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BuyFindarrow_forward

Calculus (MindTap Course List)

8th Edition
James Stewart
ISBN: 9781285740621
Textbook Problem

A cylindrical glass of radius r and height L is filled with water and then tilted until the

water remaining in the glass exactly covers its base.

(a) Determine a way to “slice” the water into parallel rectangular cross-sections and then set up a definite integral for the volume of the water in the glass.

(b) Determine a way to “slice” the water into parallel cross-sections that are trapezoids and then set up a definite integral for the volume of the water.

(c) Find the volume of water in the glass by evaluating one of the integrals in part (a) or part (b).

(d) Find the volume of the water in the glass from purely geometric considerations.

(e) Suppose the glass is tilted until the water exactly covers half the base. In what direction can you “slice” the water into triangular cross-sections? Rectangular cross-sections? Cross-sections that are segments of circles? Find the volume of water in the glass.

Chapter 5.P, Problem 4P, A cylindrical glass of radius r and height L is filled with water and then tilted until the water

To determine

(a)

A way to “slice” the water into parallel rectangular cross-sections and thenset upa definite integral for the volume of the water in the glass

Explanation

Concept:

Let S be a solid that lies between y=a  and y=b. If the cross sectional area of S in the plane Py through y and perpendicular to the y axis, is A(y), where A  is a continuous function, then volume of S is

V=abAydy

Calculation:

Consider the diagram below.

In order to take rectangular cross sections, slice the water in xz  plane.

Viewing from FV forms the circle of radius r in xy plane, which can be considered as the width of rectangle, and viewing from SV forms the triangle, which can be considered as the length of the rectangle.

Equation of the circle passing through the origin:

x2+y2=r2

x2=r2-y2

x=r2-y2

Now width of rectangle is 2x.

w=2x=2r2-y2

To calculate length BC, consider PQR and PBC

To determine

(b)

A way to slice water into parallel cross-sections and then set up a definite integral for the volume of the water in the glass

To determine

(c)

To find:

Volume of water

To determine

(d)

To find:

Volume of water

To determine

(e)

To find:

Volume of water

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