Recent content by pb23me

Homework Statement The rigid truss supports the loads shown. Find the reactions the pin A and roller D exert on the truss. All concentrated loads act on the pins joining the truss membersHomework Equations ƩMa= -5ft(3kips)-10ft(2kips)-.707(1kip)10ft+Dy(15ft) Dy=2.80 kips*ft The Attempt at a...

Oh I see what I've been doing now. When I evaluated theta at 0 I was getting -2. I forgot to multiply this by 1/2 which would have given me 3(pi)(-2+2)/2 or 3(pi)/2 for my final answer. Thank you so much for all of your help I was stuck on that problem for awhile. :smile:

I get (3(pi) + 2)/2

i put a picture up

Homework Statement Use a double integral to find the area of the region bounded by the curve r= 1+sin(theta)? Homework Equations The Attempt at a Solution I can't figure out what theta is intregrated from. I've tried from -(pi)/2 -> +(pi)/2 and that doesn't work. I've also tried...

Thank you for your assistance:biggrin:

The point I picked on the line l for the parametric equation was not point (1,1,2)... So whatever point you pick on the line for your parametric equation is that your t=0 point? If I were to pick point (1,1,2) on the line l for the parametric equation then it becomes x=1+t u=1+2t z=2+3t...

idk if you change it by one I guess you reach along the line one. I just don't know this stuff because we haven't covered it yet in class yet we have homework over it.

oh sorry, the length between the vector and line l is 3.

I know that the magnitude of the vector with the point c is 5. So using cos(36.7)=x/5 I get x=4 this is the length along line l. However this is in three dimensions so I thought that there was something else I had to do.

Yes I know right triangles in two dimensions however this is in three dimensions. Thats what is confusing this for me.

I just posted a better picture

Homework Statement Find point d on the line l closest to the point c (1,1,7). Point c is on the end of a vector who's origin (1,1,2) is on line l. There is an imaginary line that connects point c to point d. This imaginary line is perpendicular to the line l. This problem is relating to...

Yeah I figured it out. It was talking about the dip for the west direction not the strike. I was mixing two different things up. Thats why it was making any sense... Thank you

[b]1. Homework Equations The Attempt at a Solution