Homework Statement
a solid in the first octant is bounded by the planes y=0 and z=0 and by the surfaces z=4-x^2 and x=y^2. its density function =kxy, k is a constant. find the mass of the solid and the center of mass
Homework Equations
My= double integral of D[x*kxy]dA
Mx=double...
Homework Statement
the region between the planes x+y+2z=2 and 2x+2y+z=4 in the first octant
Homework Equations
triple integral of region R dzdxdy
The Attempt at a Solution
I need a lot of help starting this problem. I have no idea what to do. Please help me!
Homework Statement
the region in the first octant bounded by the coordinate planes and the planes x+z=1, y+2x=2
Homework Equations
triple integral or region R dzdxdy?
The Attempt at a Solution
i need a lot of help for this problem
converted the cartesian equations to polar and used the 1/area*double integral of region R [z]rdrdpheta. I am having much difficulty integrating r*sqrt(a^2-r^2). i tried a trig substitution but don't know how to finish from there. please help me!
Homework Statement
find the anverage heigh of z=sqrt(a^2-x^2-y^2) constricted by the cone x^2+y^2<=a^2
in the xy plane
Homework Equations
Average Height =(1/area)*double integral of region of [z]drdpheta
The Attempt at a Solution
I really have no idea how to solve this problem can...
Homework Statement
convert line one to polar integral and then evaluate
see problems 16 attachement
Homework Equations
r^2=y^2+x^2
The Attempt at a Solution
I changed to polar and evaluated the double integral but I come up with an answer of negative pi which seems odd since it...
Homework Statement
convert double integral from line one to polar integral and then evaluate
see problem 12 attachment
Homework Equations
y=rsinx
x=rcosx
r^2=x^2+y^2
The Attempt at a Solution
see problem 12 attachment
I calculate a area of zero. are my limits wrong and if...
Homework Statement
w=x^2+y^2+z^2 and ysin(z)+zsinx=0
find (delw/dely)xindpendent
find (delw/dellz)zindependent
Homework Equations
The Attempt at a Solution
For the first one I think I can use a chain rule where find (delw/dely)xindpendent= delw/delx*delx/dely +...
Homework Statement
x^2+y^2=r^2
y-rcos(pheta)
find (partialy/partialr)subscribt phetal, find (partialy/partialpheta)subscribtx, and find (partialy/partial)subsribt pehta
Homework Equations
im not sure how to write this partial in chain rule form. i think the first one...
Homework Statement
During a lab we used a 570turn solenoid powered by a current of 5amp. For the last part of the experiment we were to take several measurements of the field strength across the cross-section of the solenoid. So we moved the field sensor around inside the solenoid and made...
Homework Statement
Find the maximum values of f(x,y,z)=xy+xz+yz-4xyz subject to the constraints x+y+z=1 and x,y,z>or equal 0.
Homework Equations
The Attempt at a Solution
see attachment
I found fgrad and ggrad and set fgrad equal to lambda*ggrad and used x+y+z=1 for my system of...