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1. Finding Tau and K from unit step response

Homework Statement Simulate the system to look at the output response with a unit step input applied i.e. use the step command. Confirm the values of K and τau from the simulated response are the same as those you have entered into the simulation. Note that the step command can be used with...
2. Buzzing/Whining sound from speakers when connected to laptop

windows audio is at max. and after checking carefully, i cans till hear the hum from the integrated speakers on the laptop. so its not an external problem. its just because the external speakers are louder.
3. Buzzing/Whining sound from speakers when connected to laptop

Hi, when i plug my speakers into my laptop, i can hear a slight whining sound from one of the speakers. i assumed it was the speakers, however i plugged some brand new headphones in, and the same problem occurred. this leaves me to believe it is a problem with the laptop. does anyone know why it...
4. Calculate power in air compression.

Homework Statement In an air compressor air flows steadily at a rate of 15 kg per minute. The air enters the compressor at 5 m/s with a pressure of 1 bar and a specific volume of 0.5 m3/kg. The air leaves the compressor at 7.5 m/s with a pressure of 7 bar and a specific volume of 0.15...
5. Thermodynamics: Calculating mass of air over a change in pressure/temperature

ah ok. thanks for the help. like i said above, do you have a directory on this site, or know a link to one, of all the thermodynamics equations?
6. Thermodynamics: Calculating mass of air over a change in pressure/temperature

Oh i see, use pv = nRT to work out n. ok, so from n = PV/RT, am i right in assuming the values of p, V and T are the differences? n = pV/RT so n = (2850000 x 3)/(8.314 x 35) n = 29382.45 m = nM so m = 851150.9 Im sure this is wrong as it seems too large.
7. Thermodynamics: Calculating mass of air over a change in pressure/temperature

what is n though? is this not a constant? i am not given it in the question
8. Thermodynamics: Calculating mass of air over a change in pressure/temperature

Homework Statement A vessel of capacity 3 m3 contains air at a pressure of 1.5 bar and a temperature of 25o C. Additional air is now pumped into the system until the pressure rises to 30 bar and temperature rises to 60o C. The molar mass of air is 28.968 g/mol. Homework Equations...