Recent content by mahdert

you are trying to access the zeroeth index, MATLAB indices start with 1 and not 0.

Homework Statement a thermometer wall mounted through the wall of a steam pipe is a steel tube with 0.1 in wall thickness, 0.5 in outer diameter, 2 in length and k=26W/(mK). The flow produces an h value of 100W/(m^2K) on the outside surface of the well. If the thermometer reads 149 deg C...

So what is the justification for assuming uniform tension across the string.

I see. I can only suppose that this follows the assumption that the string is of uniform density. What if this is not the case? How would one proceed.

In deriving the governing equation for a vibrating string, there are several assumptions that are made. One of the assumptions that I had a hard time understanding was the following. Once the string is split into n particles, the force of tension on each particle from the particles in the...

Can anyone please explain to how one can use a set of BCD switches on a PCB and use them as a clock source? Thanks.

Hello all, I am currently working on a project where I am to analyze the rotation of a shaft in a particular piece of machinery and use this information to get a meaningful relationship between two other independent parameters of the machine. The rotation of the shaft is the only indicator that...

Simple Thermodynamics Problem Is this a single variable problem?

I am trying to use the fundamental relation: Tds = dU + pdV and equate it with the partial expansion of U = U(V,p), however, I keep getting stuck because I do not know how to get the relationship of the change in U with either a change in V or p for a given temperature.

Homework Statement Show that the internal energy of a material whose equation of state has the form p = f(V), T is independent of the volume and the pressure. That is \left(\frac{\partial U}{\partial V}\right)_{T} = 0 \left(\frac{\partial U}{\partial p}\right)_{T} = 0 Homework...

C_p = 5/2 R; I did the integration and I got the right answer. But the question remains, the specific heat capacity at constant pressure; C_p should be used at constant pressure. Here, the pressure is changing? A qualitative expalnation would suffice. Thanks

Homework Statement what is the entropy of 1.0 litre of gasoues n2 at Ta=350 K and Pa=2.0 bar given that So = 191.61 J/(K gmol) at To = 298.15 K and Po = 1 bar? Homework Equations I think : S(at 350) - So = NC_p ln (Ta/To) - NR ln(Pa/po) The Attempt at a Solution My problem is, C_p...

thanks for the explanation.. i understand now..

The unit for the temperatures, you mean. I expressed them in Farenheits (deg F)..That will be t1 = 310.92 K and t2=255.37 K. Since heat is being drawn from a body with a lower temperature than the resevour, we need to supply work. The minimum amount of work would be what we would need for a...

Homework Statement Find the minimum amount of work required to extract 4000 J of heat from a body at 0 deg F, when the temprature of the environment is 100 deg F. Homework Equations W = (1 - t2/t1) * Q1 The Attempt at a Solution My answer is 1072 J instructor says 870.19, how??