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1. ### Matlab report help please (Finite Difference Method)

I would say the essential point is that, as there are no heat sources in the plate, then at steady state, the heat flowing into any bounded region exactly equals the heat flowing out of that region, or Div D = 0 (ie the divergence is zero). Hence the temperature at any grid point is the average...
2. ### Engineering How could a solar farm affect the trains' signalling?

May I dispute "unanswerable"? :cool: It is answerable ... ... but the assumptions which need to be made give an answer which is probably of no use whatsoever. Of course, if you have a solar farm in Afghanistan, if your train is in Venezuela and if you only want the train to run during the...
3. ### Engineering How could a solar farm affect the trains' signalling?

I think other responders have been too cautious. All we need to do is to make some assumptions: You build your solar farm in Afghanistan Your train is in Venezuela The electrical power from your Afghanistan solar farm which you feed into the Venezuelan train infrastructure meets the Venezuelan...
4. ### Engineering The connections in designing an I/O interface with output port

I am not sure I even understand what you are being asked to do. A 74LS373 device is a latching device. See its data sheet. The outputs Q0 - Q7 follow the inputs D0 - D8 until the device is clocked when the outputs are locked at the last value. Hence, as the input varies, the output will...
5. ### Engineering How to find the angular velocity of a rotating drum?

If the pulley 5 falls 1 unit of distance in one second a) what is the speed of the rope at A? b) what is the speed of the rope at B? c) what is the speed of the rope at C? d) by how much does the circumference of pulley 3 move in one second? So what is pulley 3's angular velocity? You...
6. ### Crankshaft compression point

Point A in your first diagram Figure 1 is not in the same place as point A in your second diagram Figure Q5.
7. ### Engineering Bode plot for active low pass filters

Please let us know how you get on so that if my advice of sketching was bad :frown: I don't give it again. In principle, I think what the question is aiming at is trying to get you to see what is important and what isn't. A simple low pass filter is characterised by: - a flat gain response up...
8. ### Engineering Bode plot for active low pass filters

You have the transfer functions which you need to plot. You don't need R1 and R2 because you are told G = R1/R2. G is therefore a scaling factor on the Gain axis - label it 1G, 2G, 3G etc. You don't need C because you have ω/ωc. = see DaveE's post. It says "sketch a bode plot" so do it by...
9. ### Engineering Bode plot for active low pass filters

You need to select a number of appropriate frequencies and calculate the gain (in dB) and the phase (typically degrees) for each frequency. Plot the results using linear (gain, phase, vertical axis) and log (frequency, horizontal axis) to show the "straight lines". Be sure to select...
10. ### ASME compliance in Pressure Vessel design

Is an open container 1,000mm in diameter and 1,000mm high a pressure vessel? It cannot be pressurised apart from the hydraulic pressure of the liquid content. https://www.inspection-for-industry.com/pressure-vessel-definition.html says It strikes me it is just a container. It looks like...
11. ### Engineering Calculating the unknown voltages in ideal op-amp circuits

If the circuit is working (ie the amp is in its linear working range and the output is not driven to either rail voltage) then the difference between the -ve and the +ve inputs will be Vout / Amp gain. As the Amp gain is very, very high, the difference will be effectively zero. That is why...
12. ### Engineering How does this Bipolar RF Amplifier + Output Transformer circuit work?

It would help if you labelled the components in the diagram The purpose of the capacitor across the emitter resistance is to increase the ac, or signal frequency, gain. Its time constant, T = CR, is set to be much longer than the signal frequency. The voltage divider sets the base voltage to...
13. ### Engineering Truss problem with counter members

First note that there are no joints at the centres of the diagonal members so this is a simply pin jointed structure which means that all forces can only be in the direction of the members. Your calculation of the reaction forces by taking moments is correct - reaction at A is 12 and at H is...