Exam 7: Applications of the Integral

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A spring in equilibrium is 10 inches long and an external force of 30 pounds stretches the spring to a length of 18 inches. The work done by the spring in stretching it from equilibrium to 12 inches, in inch-pounds, is ​

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By the Pappus Theorem, the volume of the solid formed by revolving the region enclosed by the circle x2+(y2)2=1x ^ { 2 } + ( y - 2 ) ^ { 2 } = 1 about the x-axis is

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A trough whose cross-section is a right isosceles triangle whose base is 6 feet long and altitude is 4 feet long is filled with water of density 62.5 pounds per cubic foot. The force, in pounds, due to hydrostatic pressure on one end of the trough is

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A trough whose cross-section is a trapezoid whose lower base is 4 feet long and upper base is 6 feet long, and is 1 foot high is filled with water of density 62.5 pounds per cubic foot. The force, in pounds, due to hydrostatic pressure on one end of the trough is

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A trough whose cross-section is a right isosceles triangle whose base is 4 feet long and altitude is 4 feet long is filled with water of density 62.5 pounds per cubic foot. The force, in pounds, due to hydrostatic pressure on one end of the trough is

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The arc length of y=(x+1)32+1 for x[1,8]y = - ( x + 1 ) ^ { \frac { 3 } { 2 } } + 1 \text { for } x \in [ 1,8 ] is

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Three particles having masses 1, 2, and 3 kg are located on the x-axis at 3,1,-1 respectively. The center of mass of this system is located at x =

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Let yˉ\bar { y } denote the y-coordinate of the centroid of the region enclosed by x=2yy2x = 2 y - y ^ { 2 } and y=0y = 0 Then yˉ\bar { y } =

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Let V be the volume of the solid generated by revolving the region enclosed by y=2x2,y = 2 x ^ { 2 }, the x-axis, x=1;x = 1; about the y-axis. Then V is

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Let V be the volume of the solid generated by revolving the region enclosed by y = x2, y = 2 - x; about the x-axis. Then V is

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A tank in the form of an inverted right circular cone is 8 meters across the top and 16 meters deep. The tank is filled with a liquid with the height of 8 meters weighing 950 kg/cu m. The work done, in Newton-meters, of pumping all the liquid out is

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A cylindrical sewer pipe of radius 1 foot is half full of water of density 62.5 pounds per cubic foot. A gate used to seal off the sewer is placed perpendicular to the pipe opening. The force, in pounds, due to hydrostatic pressure on one end of the gate is

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The work done by a winch winding in a 120-foot chain weighing 240 pounds, in foot-pounds, is ​

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Let V be the volume of the solid generated by revolving the region enclosed by y = -x3, y = x3 - 2x2; about the y-axis. Then V is

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A trough whose cross-section is a trapezoid whose lower base is 4 feet long, upper base is 8 feet long, and is 4 feet high is filled with water of density 62.5 pounds per cubic foot. The force, in pounds, due to hydrostatic pressure on one end of the trough is

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Let V be the volume of the solid generated by revolving the region enclosed by about the x-axis. Then V is

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Let V be the volume of the solid generated by revolving the region enclosed by y = x2, y = x - x2; about the x-axis. Then V is

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Let V be the volume of the solid generated by revolving the region enclosed by y=x,y = \sqrt { x }, the x-axis, x=4;x = 4; about the y-axis. Then V is

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The arc length of y=ln(secx) for x[0,π4]y = \ln ( \sec x ) \text { for } x \in \left[ 0 , \frac { \pi } { 4 } \right] is

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Let V be the volume of the solid generated by revolving the region enclosed by y = x2, y = x + 2; about the x-axis. Then V is

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