the rate of change of the

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter61: Areas Of Circles, Sectors, And Segments
Section: Chapter Questions
Problem 50A
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1.The sides of an equilateral triangle are increasing at the rate of 3 cm/min. Find: a) the rate of change of the perimeter. b) the rate of change of the area when the side is 3 cm. long. 2. An open rectangular box w/ square ends to hold 6400 cu ft, is to be built at a cost of Php 75.00 per sq ft. for the base and Php 25.00 /sq ft for the sides. Find the most economical dimensions. 3. A rectangle is inscribed in a right triangle of sides 5, 12, and 13. What are the dimensions of the rectangle of greatest area if the its sides coincides with the legs of the triangle. 4. An open box is to be made from a square piece of cardboard, 18 inches by 18 inches, by cutting out equal squares from each corner and folding up the flaps to form the sides. Find the dimensions of the largest box that can be constructed in this way? 5. A truck is 300 kilometers due east of a car and is traveling west at a constant speed of 30km/hr. Meanwhile, the car is going north at a constant speed of 60 km/hr. (a) At what rate are they separating or approaching after 2 hours? (b) At what time are they closest to each other 6. A window is in the form of an equilateral triangle surmounted on a rectangle. The rectangle is of clear glass and transmit twice as much light as does the triangle which is made of stained glass. If the entire window has a perimeter of 20 feet, find the dimensions of the window that will admit the most light. 7. A 6-foot-tall man walks away at the rate of 4 ft/sec from the base of a street light 12 feet above ground. At what rate is the length of his shadow changing when he is 20 feet away from the base of the light? At what rate is the tip of his shadow moving? 8. Water is running out of a conical funnel at the rate of 2 cubic inches per second. Th radius at the top of the funnel is 6 inches and the height of the funnel is 12 inches. How fast is the water level dropping when the water is 4 inches deep?
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