# Search results

1. ### Statics: Two-member Frame

ok I got it now... I was supposed to plug in the roller support reaction into the FBD of AC on top of Cy and Cx...that was throwing the whole thing off... thanks again.
2. ### Statics: Two-member Frame

Thank you for the reply. So if I take the entire frame would C then become a roller and not a pin?
3. ### Statics: Two-member Frame

Homework Statement The two-member frame (see picture attached) supports the 200-lb cylinder and 500 lb–ft couple moment. Determine the force of the roller at B on member AC and the horizontal and vertical components of force which the pin at C exerts on member CB and the pin at A exerts...
4. ### Statics: Forces in Cartesian Vector form

ok thank you very much....
5. ### Statics: Forces in Cartesian Vector form

I wrote it exactly as it was given.
6. ### Statics: Forces in Cartesian Vector form

im just not sure if this means that its -6.216i for the position vector of AD or -6.216i for the actual x component for the tensile force...I just don't see how it could be -6.216 for the tensile force when the magnitude is 14000 lbs. Having the x component of the position vector of AD...
7. ### Statics: Forces in Cartesian Vector form

Homework Statement For cable AD it is known that the magnitude is 14 kips, x-component has a value of -6.216, the direction angle in the z-direction is 83.63°, and Fy is less than zero. Find forces in Cartesian vector form, coordinates of point D if it lies on the x-z plane and point A is (0...
8. ### Statics- Resultant couple moment

thanks for the replies guys...
9. ### Equilibrium and displacement of a Particle

yeah sorry i worded the problem wrong...still, thank you for all the replies...ill do a better job next time.
10. ### Statics- Resultant couple moment

Homework Statement If F_1 = 100N , F_2 = 120N and F_3 = 80N , determine the magnitude and coordinate direction angles of the resultant couple moment. Homework Equations M=Fd M=r x F MR=Ʃ(r x F) The Attempt at a Solution I found the couple moment for each force: M1=F1d=100(0.2) or...
11. ### Equilibrium and displacement of a Particle

right I know how to set up the problem... but once I try to solve for d the algebra just throws me off.

13. ### Equilibrium and displacement of a Particle

sorry it should be s=*lstretched-l0...
14. ### Equilibrium and displacement of a Particle

the force of the spring is k(s)... k=600 is given, and I know s = l - l0; therefore Fspring=600(l-l0). l0 is also given and equals 1.5m so the equation becomes 600(l - 1.5). Looking at the triangle the two springs create with the wall we can deduce that l (length of the stretched spring) is...

anyone?
16. ### Equilibrium and displacement of a Particle

Homework Statement The springs AB and BC have stiffness k and an unstretched length of l. Determine the displacement d of the cord from the wall when a force F is applied to the cord. See Picture attached. Given: l = 3 m k = 600 N/m F = 200 N Homework Equations Fspring= ks s=...
17. ### Vectors & Force Physics

oh wow, ... thanks!.... even when I was typing it I didn't catch it....
18. ### Vectors & Force Physics

Homework Statement a) Express each force as a Cartesian vector. b) Determine the magnitude and coordinate direction angles of the resultant force acting on the hook. See figured attached. Homework Equations The Attempt at a Solution First I expressed F1 and F2 into its x, y...
19. ### Best fit value of eddy thermal diffusivity

so once I have the slope just solve for α?
20. ### Best fit value of eddy thermal diffusivity

Im not quite sure how I would go about doing that; but thanks for the reply.
21. ### Best fit value of eddy thermal diffusivity

Sorry, here is a better look at the Temperatures from July 19th 19-Jul T(C) 28.4 27.9 28 27.9 27.4 26.2 23.6 21.4 19.3 17.9 16.8 15.9 15 14.1 13.2 12.4 10.6 9.8 9.3 9.1
22. ### Best fit value of eddy thermal diffusivity

Homework Statement A mathematical model for temperature T as a function of depth y (in m) and time t (in days) is: (T(y,t)-T0)/(Tsurf(t)-T0)=e^(-y2/4αt) (2) where Tsurf(t) is the water temperature of the lake surface at time t, α is a property called the “eddy thermal diffusivity” and...
23. ### Temperature Profile in Lake

thank you, I really appreciate you guys help.
24. ### Temperature Profile in Lake

y=±sqrt(2αt)... so know I differentiate this wrt "t", correct?
25. ### Temperature Profile in Lake

so for the second partial I get: (-1/2αt)[Tsurf(t)-T0]e^(-y2/4αt)+(y2/4α2t2)[Tsurf(t)-T0]e^(-y2/4αt) and the second part asks me to get the partial of this with respect to "t"... when doing this does Tsurf(t) just becomes T'surf(t)?

thank you...
27. ### Temperature Profile in Lake

oh wow yeah... so the first derivative would come out to (Tsurf(t)-T0)e^(-y2/4αt)(-2y/4αt) which then simplifies to (-y/2αt)(Tsurf(t)-T0)e^(-y2/4αt), correct? And then for the second derivate I would need to product rule this all up...
28. ### Temp profiles through partial derivatives

Homework Statement The separation of layers is considered to occur at the thermocline, which is defined as the location of the steepest slope in the temperature gradient. Mathematically, this occurs at the inflection point – so the position of the thermocline can be found from the following...
29. ### Temperature Profile in Lake

from T(y,t)=e^(-y2/4αt)(Tsurf(t)-T0)+T0 I know that only the exponential expression contains a y so everything else becomes a constant and the last T0 drops off... so for the first partial derivative this becomes (Tsurf(t)-T0)e^(-y2/4αt)(-2/4αt) then for the second partial its pretty much...
30. ### Temperature Profile in Lake

Homework Statement Lakes become stratified in temperature over the course of the year because of the way that heat transfer occurs. In the spring, the temperature of a lake as a function of depth is reasonably constant. During the summer, as heat enters the lake from solar radiation, the...