# Search results

1. ### Circuit diagram question

I'm a little stuck in trying to simplify the circuit using the hint. I'm not sure set of nodes to connect
2. ### Circuit diagram question

yes it is symmetric
3. ### Circuit diagram question

Homework Statement I am trying to find the current across Rg. I do not understand the answer provided Homework Equations The Attempt at a Solution Am I supposed to add the two voltage sources and then continue?
4. ### Help with view factors

Homework Statement I found the values ##F_{3\rightarrow(1+2)}=0.32## and ##F_{1\rightarrow3}=0.25## I now want to find ##F_{2\rightarrow3}## Homework Equations Reciprocity relation ##A_iF_{i\rightarrow j}=A_jF_{j\rightarrow i}## The Attempt at a Solution Using the reciprocity relation to find...
5. ### How to find peak time?

Homework Statement I am trying to find the peak time and %OS from the diagram Homework Equations The Attempt at a Solution I know how to get the %OS but for the peak time, isn't it just the time of the first peak, so around 1.1s? But the answer I am supposed to be getting is 0.0922s
6. ### Velocity diagram for a rotating blade

Homework Statement http://postimg.org/image/5o9kcuj57/ I do not understand what the vectors W and V represent Homework Equations The Attempt at a Solution I know U is the tip speed velocity but I don't know about the other two
7. ### Help on simplifying block diagram

thanks. Also, for the first diagram,on the very first run of the loop, is the signal exiting the (2s+1)/s block the same after it passes through the summing junction?
8. ### Help on simplifying block diagram

Homework Statement I am trying to understand the simplification between these two block diagrams Homework Equations The Attempt at a Solution I understand the 2s+1/s has been moved past the summing junction, resulting in the 2s. But I dont understand where the s/2s+1 block comes from
9. ### Number of linearly independant motions

Homework Statement http://postimg.org/image/uc0c581cb/ For (b), how many points of linearly independent motion are present in this system? Homework Equations The Attempt at a Solution The solution says there is rotation of J1, between K1 and D1, to the right of K2 and finally J3 But isn't...
10. ### Engineering Introductory book for mechanics of machines?

Topics covered include links, mechanisms, Kinematics of rigid bodies : Relative Velocity and Acceleration method, Instantaneous Centre Method, Dynamics of Rigid Links, Gears, Cams etc I cuurently have this book ...
11. ### Torque and moment

Homework Statement Attached image Homework Equations The Attempt at a Solution The book says that the force P causes a torque about the x axis. Why is it not a moment about x? Why is it specifically a torque in this case?
12. ### Shear stress in thin wall beams

Homework Statement http://postimg.org/image/9va37id55/ The question is to find the shear stress at the points A, B and C. The solution uses the sectioning planes aa, bb and cc to do so. For example, at C, how should I know whether to use a horizontal or vertical sectioning plane. Also, how...
13. ### Dew point temperature

Homework Statement This is a diagram T-v diagram for a closed system consisting of a sample of moist air that is cooled at constant pressure can someone explain what happens for the state of the water vapor to move from d to 2? if its cooling at constant pressure, why does it not stay on the...
14. ### Dimensional analysis

Homework Statement How do I set up a matrix to find the combination of ( M(L^2)/T ) and I ( L^4) that results in units of M/ ( L^2 T^2 ) ? Homework Equations The Attempt at a Solution I think it looks something like [ 1 0 2 4 -2 0 ] * [ a1, a2, a3] = [1 -2 -2] but the dimensions of...
15. ### Pressure force on a control volume

Homework Statement http://postimg.org/image/4a8sv6umh/ Why do the pressure forces due to p1 and p2 act in the same direction? Homework Equations The Attempt at a Solution I thought that, given the direction of the flow, the pressure force on the bottom and top would act in opposite directions
16. ### Momentum relation for control volume

thanks everyone
17. ### Momentum relation for control volume

thanks, I finally understand that I still don't understand this part How does the 4cm take into account the other stream; the second "mass flow rate* V *cos(theta/2)" term
18. ### Momentum relation for control volume

could you also explain why mass flow rate per unit depth is calculated as density x velocity x 4cm
19. ### Momentum relation for control volume

Homework Statement http://postimg.org/image/i4p19540z/ Homework Equations Resultant force on the control volume = Mass flow rate (Velocity outlets -Velocity inlets) The Attempt at a Solution I am just wondering if the 4cm is called depth, then what is the term for the "into the paper"...
20. ### Dew point and exhaust temperature

Homework Statement I'm trying to find some information on "How does the dew point control the exhaust temperature of a thermodynamic cycle?" Homework Equations "The dew point is the temperature at which the water vapor in a sample of air at constant barometric pressure condenses into liquid...
21. ### Dimension Analysis and buckingham pi

Homework Statement can someone explain why we are interested in forming dimensionless products and why only n-j of them should be formed from the problem's variables? Homework Equations Step 1: List the variables in the problem Step 2: Express each of the variables in terms of basic...
22. ### System of linear equations

Homework Statement I'm given a system of equations and I'm told to: Solve this system by hand in 4-decimal digit arithmetic with rounding, using Gaussian elimination without pivoting and backward substitution Homework Equations The Attempt at a Solution When they say 'without backward...

24. ### Hydro static forces on curved surfaces

Homework Statement http://postimg.org/image/4fhu5k9r9/ [Broken] Can someone explain what is meant by 'missing water' in this solution diagram The original question diagram had no such water above the gate AB Homework Equations The Attempt at a Solution
25. ### Representing distributed loads with singularity functions

Homework Statement could someone explain why the terms in red represent the red distributed load in the attached diagram? Homework Equations http://postimg.org/image/3x0wywr4v/ [Broken] The Attempt at a Solution the only term I think I understand is the -3<x-0>^0 but I'm not sure of the rest
26. ### Plotting singularity functions

thanks, I have another question: at x=6, I'm supposed to be getting V(x)=0 but summing the dotted curves, I get (23/4) -3(6) +3(3) + (1/6)(6^2) - (1/6)(3^2) + 2(3) + (7/4) =9
27. ### Plotting singularity functions

Homework Statement Can someone explain how the expression for V(x) is plotted? Homework Equations The Attempt at a Solution I understand the plots for the dotted lines but not how they got the actual plot for V(x)
28. ### Inner product for work

Homework Statement http://postimg.org/image/lgphyvggz/ Homework Equations The Attempt at a Solution can someone explain where that transpose came from in (3.3)?
29. ### Only conservative vector fields are path independent?

does anyone have a proof of this?
30. ### Gradient vector perpendicular to level curves?

Homework Statement can anyone explain/prove why the gradient vector is perpendicular to level curves? Homework Equations The Attempt at a Solution