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 members
Homework Equations
ƩMa= -5ft(3kips)-10ft(2kips)-.707(1kip)10ft+Dy(15ft)
Dy=2.80 kips*ft
The Attempt...
Oh I see what ive 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:
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 doesnt work. I've also tried...
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.
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.
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
I just got a adjustable dc power supply and I cannot figure out why it will not produce 1-2V at very small amps such as 10-20 milli amps? Is this not possible with a common dc power supply? I would greatly appreciate some help with this...
ok thanks, When looking at more complex solutions sometimes there are many logx's how am I supposed to know which one is logx and which one is not really logx?
Homework Statement
I know it is supposed to be lnx however I find something peculiar. When I integrate it in wolfram alpha they give the integral as log(x). What the heck is going on here!?!
Homework Equations
The Attempt at a Solution
Thanks, I did draw them out and the graphs intersect at x=3 and x=-3
They do not intersect at x=2 and x=-2 even though 2 and -2 solve the equation when I set the two functions equal to eachother.
Homework Statement The graphs y=abs(x) and y=(x^2)-6 intersect at x=3 and x= -3
What is confusing me is when I set them equal to eachother and solve (x^2)-x-6=0 and (x^2)+x-6=0 I get -3,+3,-2,+2
What is the deal with the negative 2 and pos 2?
Homework Equations
The Attempt...
Homework Statement
Find the area between f(x)=(x-1)^3 and f(x)=(x-1) on the interval from 0 to 2.
Homework Equations
The Attempt at a Solution Working it out Im using the top function minus the bottom function from 0 to 1 and then from 1 to 2. The graphs cross at x=0,x=1,andx=2...
Homework Statement
determine the terminal voltage in each battery.
Emf1=18V
r1=1 ohm
EMF2=12V
r2=2 ohm
R=6.6 ohms
also the batterys currents are opposing each other.
Homework Equations Vab=emf-Ir
The Attempt at a Solution i used kirchnoffs rule to find the current I ...
My question is about the double slit experiment..I was just listening to a guy explain this experiment on youtube and I got skeptical at one point in his explanation. He said that when the photons went through the double slits the detectors were turned" on" then the observers viewed the results...
ok thanks, but for the second problem i meant to write: If the car is traveling along and the road is banked at 13 degrees, and there is no friction, at what velocity would the car begin to slide? If im remembering correctly it seems as though my professor broke up the mg component for this...