Question and Answers Forum

All Questions      Topic List

Integration Questions

Previous in All Question      Next in All Question      

Previous in Integration      Next in Integration      

Question Number 144528 by imjagoll last updated on 26/Jun/21

Find the volume of the region   bounded by the elliptic paraboloid  z = 4−x^2 −(1/4)y^2  and the plane z=0

$$\mathrm{Find}\:\mathrm{the}\:\mathrm{volume}\:\mathrm{of}\:\mathrm{the}\:\mathrm{region}\: \\ $$$$\mathrm{bounded}\:\mathrm{by}\:\mathrm{the}\:\mathrm{elliptic}\:\mathrm{paraboloid} \\ $$$$\mathrm{z}\:=\:\mathrm{4}−\mathrm{x}^{\mathrm{2}} −\frac{\mathrm{1}}{\mathrm{4}}\mathrm{y}^{\mathrm{2}} \:\mathrm{and}\:\mathrm{the}\:\mathrm{plane}\:\mathrm{z}=\mathrm{0} \\ $$$$ \\ $$

Answered by EDWIN88 last updated on 03/Jul/21

vol = 4∫_0 ^( 2)  ∫_( 0) ^( 2(√(4−x^2 ))) (4−x^2 −(1/4)y^2 )dy dx         = 4∫_( 0) ^( 2) (4y−x^2 y−(1/4) (y^3 /3))_0 ^(2(√(4−x^2 ))) dx         = 16π

$$\mathrm{vol}\:=\:\mathrm{4}\int_{\mathrm{0}} ^{\:\mathrm{2}} \:\int_{\:\mathrm{0}} ^{\:\mathrm{2}\sqrt{\mathrm{4}−\mathrm{x}^{\mathrm{2}} }} \left(\mathrm{4}−\mathrm{x}^{\mathrm{2}} −\frac{\mathrm{1}}{\mathrm{4}}\mathrm{y}^{\mathrm{2}} \right)\mathrm{dy}\:\mathrm{dx} \\ $$$$\:\:\:\:\:\:\:=\:\mathrm{4}\int_{\:\mathrm{0}} ^{\:\mathrm{2}} \left(\mathrm{4y}−\mathrm{x}^{\mathrm{2}} \mathrm{y}−\frac{\mathrm{1}}{\mathrm{4}}\:\frac{\mathrm{y}^{\mathrm{3}} }{\mathrm{3}}\right)_{\mathrm{0}} ^{\mathrm{2}\sqrt{\mathrm{4}−\mathrm{x}^{\mathrm{2}} }} \mathrm{dx} \\ $$$$\:\:\:\:\:\:\:=\:\mathrm{16}\pi\: \\ $$

Terms of Service

Privacy Policy

Contact: info@tinkutara.com