hmm yes i get most of your explanation but where I am confuse is, since the density changes with the radius i thought the way to write the infinitesimal part
dm=dρ*dV where dp implies that there is an infinitesimal change in density too
dV=h.r.dr.dθ
or should i write it...
Write the expression for the infinitesimal radial inertal force dfr "look at pic"
Consider the non-uniform rigid disc of Figure 1. The density of the material is variable and depends
on the radial position: p = p (r). Its analytical expression is
p=po+p(1)
and where Po and P(1) are known and...
solving an equation??
Homework Statement
how to get from here
sin@-.3cos@=.3
to
@=33.40 degrees
Homework Equations
The Attempt at a Solution
I try every thing teacher said to put it in the calculator and find the where it intersects x-axis but I get @=30 degrees
Homework Statement
[SIZE="4"][SIZE="4"]state the order and linearity of the diff eq
(d^2u/dr^2)+(du/dr)+(u)=cos(r+u)
1)the order is the second order. since the highest derivative is 2
2) the term cos(r+u) is not linear therefore this equation is not linear.
is my reasoning for 2) right...
Homework Statement
Hi
I want to see if you guys could check my work an tell me if i did it correct and also explain me how to cancel "look at the graph"
Homework Equations
The Attempt at a Solution
Homework Statement
http://img513.imageshack.us/img513/2687/problem15001.jpg
Homework Equations
I know the answer is e but i forgat how to do the lny=xln(1+1/n) and then I solve an get an e because ln and e are inverse but i forgot the process can you please show me the process...
cal 2 ratio test "where is my mistake"
Homework Statement
I attached a pic
I solved the problem but i get 4^1 and the book says 4^2 I don't know why?
Homework Equations
http://img690.imageshack.us/img690/1518/problem15.jpg
The Attempt at a Solution