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Unformatted text preview: Home > My Assignments > Section 6.5 (Homework) About this Assignment SMALL BRIAN DIXON MA 241, section 009, Fall 2005 Instructor: Drew Pasteur North Carolina State University Due: Tuesday, October 4, 2005 11:05 PM EDT Description Applications to Physics Current Score: 0 out of 17 and Engineering Question Score 1. [SCalcCC2 6.5.04.] A spring has a natural length of 20 cm. If a 29 N force is required to keep it stretched to a length of 30 cm, how much work is required to stretch it from 20 cm to 25 cm? (No Response)[0.362] J 2. [SCalcCC2 6.5.06.] If 6 J of work are needed to stretch a spring from 10 cm to 12 cm and another 10 J are needed to stretch it from 12 cm to 14 cm, what is the natural length of the spring? (No Response)[8] cm 3. [SCalcCC2 6.5.14.] The tank shown is full of water. Given that water weighs 62.5 lb/ft3, find the work required to pump the water out of the tank. (No Response)[30700] ft-lb pts subs 1 -/3 -/20 Notes pts subs 1 -/3 -/20 Notes pts subs 1 -/3 -/20 Notes pts subs 1 -/3 -/20 Notes 4. [SCalcCC2 6.5.24.] A vertical dam has a semicircular gate as shown in the figure below. Find the hydrostatic force against the gate. (No Response)[563485] N pts subs 1 -/1 -/20 2 -/1 -/20 -/0. 3 -/20 5 -/0. 4 -/20 5 Notes pts subs 1 -/1 -/20 2 -/1 -/20 Notes 5. [SCalcCC2 6.5.26.] The masses mi are located at the points Pi. Find the moments Mx and My and the center of mass of the system. m1 = 7, m2 = 6, m3 = 1, m4 = 5; P1(1,-2), P2(3,4), P3(-3,-7), P4(6,-1) Mx = (No Response)[-2] My = (No Response)[52] center of mass = ((No Response)[2.74],(No Response)[-0.105]) 6. [SCalcCC2 6.5.28.] Sketch the region bounded by the curves, and visually estimate the location of the centroid. (Do this on paper. Your teacher may ask you to turn in this work.) Then find the exact coordinates of the centroid. ((No Response)[5.4],(No Response)[1.12]) Home My Assignments ...
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