# Search results

1. ### Find the reactions the pin A and roller D exert on the truss

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...
2. ### Double integral finding the area

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:
3. ### Double integral finding the area

I get (3(pi) + 2)/2
4. ### Double integral finding the area

i put a picture up
5. ### Double integral finding the area

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...

7. ### Find point d on the line l closest to point c

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...
8. ### Find point d on the line l closest to point c

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.
9. ### Find point d on the line l closest to point c

oh sorry, the length between the vector and line l is 3.
10. ### Find point d on the line l closest to point c

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.
11. ### Find point d on the line l closest to point c

Yes I know right triangles in two dimensions however this is in three dimensions. Thats what is confusing this for me.
12. ### Find point d on the line l closest to point c

I just posted a better picture
13. ### Find point d on the line l closest to point c

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...
14. ### How do I draw a line that is 50 deg west or 15 deg east etc

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
15. ### How do I draw a line that is 50 deg west or 15 deg east etc

[b]1. Homework Equations The Attempt at a Solution
16. ### How to get a dc power supply to produce 2V at 10-20 milliamps?

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...
17. ### What is the integral 1/x log(x) or lnx?

ok thanks guyz I precciate ya!
18. ### What is the integral 1/x log(x) or lnx?

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?
19. ### What is the integral 1/x log(x) or lnx?

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
20. ### Intersection of two graphs

ohhhhhhhh ok I get it now. Thanks guys
21. ### Intersection of two graphs

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.
22. ### Intersection of two graphs

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...
23. ### Simple integration problem

That was what it was. Thanks
24. ### Simple integration problem

Nevermind it will take me 30 mins of wasted time to type out all that goodbye
25. ### Simple integration problem

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...
26. ### Emf of a battery

what are the equations you would use in this situation?
27. ### Emf of a battery

so on the larger voltage batt would i use equation Vab=Emf-Ir = 18-(.625*1) and on the batt with voltage being forced across it use Vab=Emf+... idk
28. ### Emf of a battery

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 ...
29. ### Double slit experiment

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...
30. ### Centripetal force prob

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...