How do I setup an integral to integrate over the following equation:
V(t) = 1/(R*C) integral to t Vin(t) dt
This is the capacitor voltage over time formula.
I want to integrate over a sine wave from 9 to 81 degrees. Frequency of 120Hz, amplitude of 120V.
The formula I used in wolframalpha is...
I'm given the problem 14x+5y=31, 2x-3y=-29
This is a set of linear equations that I am asked to solve. That being said I am getting hung up on how to distribute a fraction. The answer is x=9, however, I am getting x=36 and the step I do not understand is distributing the fraction.
We then get...
On EngineersEdge.com they have a free body diagram of a scissor lift
https://www.engineersedge.com/mechanics_machines/scissor-lift.htm
Can anyone explain how the Fy, Fx components are determined? What is specifically confusing to me is how Fy is opposite in direction given the system.
To me...
I noticed that my windshield washer fluid has methanol in it to reduce the temperature of which it freezes. I know it freezes at approximately -28°C which gives us a concentration of MeOH at approximately ~30% by weight.
However, when I try to calculate the required methanol using the mSolute...
I wasn't quite sure which section to post this in but engineering was the closest to my application, although this could be a basic physics question. I'm not sure.
I want to learn how to design a counterbalance such as that in an engine crankshaft. This mechanism has been of interest to me...
I'm working out an impedance matching problem from a textbook (it is not part of any coursework) and I am trying to figure out how they get the 315 term in the polar coordinates below.
Z = (XC*RL)/(XC+RL)
= (-j333*(1000))/(-j333+1000)
= 315 , -71.58*
= 100 -j300 ohms
I calculated that...
I've searched high and low for data regarding this from scientific papers to books and I cannot find anything in regards to the approximate impedance to excite a vacuum vessel to plasma state.
In particular I want to built a RF Plasma cleaning chamber, however, I am not sure how to design the...
I've been trying to figure out why my DC subtraction amplifier is not working, and am completely baffled. I have set up an op amp with no feedback resistors with voltages applied to both the inverting and non-inverting inputs as specified below. I previously had the op amp setup with a 10x gain...
Does anyone know how to properly calculate the amount of molecular sieves needed for a pressure swing adsorption system?
I have searched application notes, books, and of course google, and while I find the basics of how they are constructed I cannot find any information on the quantity...
I was trying to calcine some CaCO3 (Calcium Carbonate), but ended up with Calcium Hydroxide.
To test if I had Calcium Carbonate I added it to some vinegar, no gas was produced. I then mixed in a small amount of the powder with a large amount of water and passed CO2 through it, and it became a...
I'm trying to calculate insulation thickness for a foundry, and can't figure it out after spending a few hours searching.
Refractory: Kast-O-Lite
Material Required: 1.44g/cm^3
Thermal Conductivity: 0.65 W/m*C
Maximum inside temperature is 1648*C
I figured there would be a minimum of...
I started off yesterday learning about specific heats, and measuring my ice cubes to figure out the correct number to cool my tea to a proper drinking temperature.
Now today I was curious how much propane would be required to melt 1L of Aluminum since I'm also interested in casting Aluminum...
How do I determine if I subtract or add the coefficient to the fraction?
ex. 1-(-48/18)*Sh=384 vs 1+(-48/18)*Sh=384? Also, It would be the Sh+Sm=312 where I get the coefficient "from" right, specifically the second "Sh" term where as the sm term is eliminated with -sm.
Thanks!
(The...
Greetings Physics Forums,
I'm reading up on Radio Circuits and studying for my General's Amateur Radio License and was learning about AM Demodulators.
I understand that in AM you can use a peak detector to get the modulated audio out however in SSB radio don't you have to double the...
Hey PhysicsForum,
When I press Right Shift + 7 (NUM.SLV) For solving linear equations i usually get the menu but now it shows a different menu instead of the popup menu it now shows Root Diffe Poly Sys and Tvm over the F keys. Can anyone enlighten me as to how to get my menu back?
Thanks...
Driving 15" LCD Possible?
Hey Physics Forum,
I have some large LCD's such as those out of laptops and I was wondering if they can be turned into a monitor for a computer or something such as a project screen. I'm not so much looking for a step-by-step or any instructions because I'm not that...