Transcription of MATH 244, Fall ’15 Final
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math 244, fall 15 FinalName:INSTRUCTIONS:Write legibly. Indicate your answer clearly. Show all work;explain your answers. Answers with work not shown might be calculators, cell phones, or (15)Find the volume of the solid bounded below by the surfacez=x2+y2and above by the planez= shaddow of the solid is a disk of radius 2. Using polar coordinates we findVol = 2 0 20 4r2rdz drd = 2 0 20(4 r2)rdrd = 8 2.(10)LetDbe the solid in the first octant, below the plane 3x+ 6y+ 2z= 6. Suppose its desity is = byIzthe second moment ofDabout thez axis.(a) Express the moment as an integral (other orders of integration lead to different expressions for thelimits of integration):Iz= 20 1 x20 3 3x2 3y0(x2+y2)dz dy dx(b) For 5 points of extra credit, you may calculateIz. It turns out to be 1 (20)Consider the upper hemisphere of a ball of radius 5,x2+y2+z2 25 andz 0. Suppose the densityis (x,y,z) = 2z. Find the massM, first momentMx,y, andz coordinatezof the center of 2 0 20 50(2 cos )( 2sin )d d d =625 2Mx,y= 2 0 20 50( cos )(2 cos )( 2sin )d d d =2500 3z=Mx,yM=834.
MATH 244, Fall ’15 Final Name: INSTRUCTIONS: Write legibly. Indicate your answer clearly. Show all work; explain your answers. Answers with work not shown might be worth zero points. No calculators, cell phones, or cheating. Problem Worth Score 1 …
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