The tutor briefly explains the low-pass filter. This explanation draws on ideas from that of a high-pass filter (see my article here). A low-pass filter sends along low frequencies but blocks higher ones. The one we’re looking at today has …
AC Electricity, electronics: how a series low-pass filter works Read more »
The tutor discusses the electric field between two parallel plates, then between two point charges. A consequence of Gauss’s Law is that, from an infinite charged plane, the electric field is constant, independent of distance, and given by E = …
The tutor tells how to access the built-in εο constant on the Sharp el-520w. The Sharp el-520w has 52 built-in constants relating to physics, chemistry, etc. Here’s how to call up εο, which has value 8.85×10-12: Press the CNST key, …
Calculator usage, physics: εο: permittivity of free space constant on the Sharp el-520w Read more »
The tutor looks more specifically into the effect of compression on gas temperature. In my January 20 post I began about thermodynamics and the effect of compressing a gas. Today, I’ll give more specific coverage. The temperature rise a gas …
Chemistry, thermodynamics: temperature increase caused by compression, continued Read more »
The tutor imagines a water pressure scenario. Let’s imagine the pressure of a faucet is 40psi (pounds per square inch). For the sake of physics, we might convert that pressure to N/m^2: (40lb/inch^2)*(9.8N/2.2lb)*(inch/0.0254m)^2=276182N/m^2 The gravitational force on a water column …
Physics: pressure: how high a column of water might a household tap support? Read more »
The tutor begins about thermodynamics with the example of compressing a gas. Thermodynamics is the analysis of energy – particularly, how it moves and/or changes form. The First Law of Thermodynamics is the Law of Conservation of Energy: Energy cannot …
Thermodynamics: first law, with compression of a gas Read more »
The tutor examines the idea that internal combustion engines are more efficient in cold weather. An upper limit for efficiency of an internal combustion engine is eff = (Tcombust – Tsurrounding)/Tcombust where Tcombust is the temp of the combustion cylinder …
Physical chemistry: efficiency of internal combustion engine in hot vs cold weather Read more »
The tutor shows how to get a best-fit line with the HP-10B. Imagine the following data: x y 3 10.1 4 14.7 9 32.5 12 47.1 To get a best-fit line for it of form y=mx+b, here are the steps: …
The tutor shows a nice trick to obtain a least squares line using matrix algebra. In my Nov 25 post I mentioned how, with Excel or LibreOffice Calc, to get a best-fit line for x y 0 3 2 5 …
Linear algebra: best fit line: method of least squares by hand Read more »
The tutor shows how to get a graph and equation for data using LibreOffice Calc, in six easy steps. Let’s imagine your x-data is in a1:a5, your y-data, b1:b5. Select the range a1:b5. Click the Chart icon, which looks like …
Spreadsheets: LibreOffice Calc: how to get a graph and equation from data Read more »