- Видео 217
- Просмотров 46 859
Jake Bobowski
Добавлен 14 сен 2014
PHYS 231 - 20240918
PHYS 231 - 20240918
Jake Bobowski - UBC Okanagan
The standard error in the mean and propagation of errors.
Jake Bobowski - UBC Okanagan
The standard error in the mean and propagation of errors.
Просмотров: 12
Видео
PHYS 301 - 20240918
Просмотров 1518 часов назад
PHYS 301 - 20240918 Jake Bobowski - UBC Okanagan The Dirac-Delta function inside integrals. Columb's law and the electric field for static source charges.
PHYS 231 - 20240916
Просмотров 284 часа назад
PHYS 231 - 20240916 Jake Bobowski - UBC Okanagan Series RC circuit transient analysis. Solving first order differential equations. The Gaussian distribution.
PHYS 301 - 20240916
Просмотров 204 часа назад
PHYS 301 - 20240916 Jake Bobowski - UBC Okanagan Spherical coordinates. The Dirac-Delta function.
PHYS 301 - 20240911
Просмотров 6716 часов назад
PHYS 301 - 20240911 Jake Bobowski - UBC Okanagan - Product rules for the del operator - Second derivatives involving the del operator - Review of the fundamental theorem of calculus - Qualitative discussion of the Divergence theorem and Stoke's theorem
PHYS 231 - 20240911
Просмотров 6516 часов назад
PHYS 231 - 20240911 Jake Bobowski - UBC Okanagan Qualitative discussion of the transient response of an LRC circuit. We consider the mechanical analogy of a mass suspended from a spring and submerged in a viscous fluid.
PHYS 301 - 20240909
Просмотров 5919 часов назад
PHYS 301 - 20240909 Jake Bobowski - UBC Okanagan Differential vector calculus: Gradient, Divergence, and Curl.
PHYS 231 - 20240909
Просмотров 6619 часов назад
PHYS 231 - 20240909 Jake Bobowski - UBC Okanagan Parallel-plate capacitors and inductors. LRC differential equation.
Wooden dowel with hemisphere cap
Просмотров 6064 месяца назад
My first CNC lathe project using a Sherline 4410 lathe. Added a hemisphere cap to the end of a wooden dowel. The original dowel was 1.25 inches in diameter.
Styrofoam Magnet Holder
Просмотров 3154 месяца назад
My first CNC milling project using a Sherline 5810 mill. Made a Styrofoam hold for film canisters. The film canisters will hold strong neodymium magnets. Made a couple of minor mistakes, but was an overall success.
PHYS 121 - 20240410
Просмотров 895 месяцев назад
PHYS 121 - 20240410 Jake Bobowski - UBC Okanagan - Review of Faraday's law and Lenz's law. - Using Faraday's law to generate electrical power - Examples problems making use of Faraday's law and Lenz's law
PHYS 232 - 20240410
Просмотров 155 месяцев назад
PHYS 232 - 20240410 Jake Bobowski - UBC Okanagan - Monte Carlo "f-Average" method for numerically approximating the value of an integral. - Determining the uncertainty in our estimate of the value of an integral.
PHYS 121 - 20240408
Просмотров 615 месяцев назад
PHYS 121 - 20240408 Jake Bobowski - UBC Okanagan - Motional emf and conservation of energy - Magnetic flux - Faraday's law - Can induce emf by: 1. Changing the magnetic field strength 2. Changing the loop area 3. Changing the angle between the area and the magnetic field
PHYS 121 - 20240405
Просмотров 885 месяцев назад
PHYS 121 - 20240405 Jake Bobowski - UBC Okanagan - Motional emf generated by pulling a conductor through a uniform magnetic field - Using motional emf to drive a current in a circuit - The magnetic force that must be overcome in order to pull the conductor at a constant speed
PHYS 232 - 20240405
Просмотров 125 месяцев назад
PHYS 232 - 20240405 Jake Bobowski - UBC Okanagan - Monte Carlo method of estimating the values of pi. - Monte Carlo "Hit & Miss" method for numerically approximating the value of an integral. - Determining the uncertainty in our estimate of the value of an integral.
Balls
critical damping is not the fastest in reaching equilibrium state...especially not in a practical sense (i.e. in experiments and applications)...e.g. damping coefficient about 10% smaller than critical can be a much better choice, and sometimes (depending on the initial conditions) even a damping coeffficient in the overdamp regime can be the fastest in reaching equilibrium state...there are some subtleties to this issue that are often not considered...
18:11 If I point my right thumb down in the direction of the induced field, the current flows the opposite way to the diagram, doesn't it?
Yes, you're right! Good catch. Thanks for pointing out my mistake.
So what's the power output?
The work done per cycle is determined by the area of the loop in the PV-diagram. Roughly speaking, with no friction applied to the flywheel, the change in volume is about 0.5 cm^3 and the change in pressure is about 1.2 kPa. Therefore, the area/work is approximately W = 0.6 mJ. In reality, the work is a little less because the PV-diagram is not rectangular. The power output is given my P = W/T, where T is the period of cycle. Without friction, the period is approximately T = 0.2 s such that the power output is about 3 mW = 4 micro-horsepower! When friction is applied, the work per cycle increases and the power output decreases. The power decreases because the period of the cycle increases more than the work per cycle.
How watch like these vidos?
28.02 class starts from here
Am i understanding correctly that the volume of the engine is calculated externally? looked like you were using a sensor to add value of the volume depending on flywheel positioning.
you explained it in the part of the video i skipped over, sorry
Alles good experiment!
Pipe internal diameter and ball?
It's in the description.
Impressive but why 100 trials ? uncertainty ?
Yes, the uncertainty in the measured period decreases as one over the square root of the number of trials.
Is it correct to assume zero pressure on the graph represents atmospheric pressure, therefore when a negative (below 0) pressure is indicated that would represent an internal working fluid pressure lower than the outside atmospheric pressure?
Yes, that is correct. The pressure sensor measures the difference between the pressure outside the engine (atmospheric pressure) and the pressure of the gas inside the engine, which can be greater than or less than atmospheric pressure.
@@jakebobowski3165 Thank you. Is there any possible way to also take temperature readings? It is difficult to understand how, in an enclosed heated space containing an expanding hot gas, the internal pressure can drop below the outside atmospheric pressure, unless there is a concomitant drop in temperature. But is there any thermocouple, or other instrument, with a fast enough response time to measure the actual gas temperature in real time?
@@peoplesresearchcenter6184 It's probably difficult to get a direct measurement of the gas temperature. However, you could deduce what it must be using the ideal gas law and knowledge of the instantaneous pressure and volume (PV = nRT). You would have to estimate the number of moles of gas contained inside the engine using the internal volume and the density of the air.
The diameter of the sphere ?
Closely matched to the inner diameter of the tube (given in the description). It's a close fit while still being able to slide smoothly.
nifty
Thanks for the video!
No worries! There are more related videos here: ruclips.net/p/PLfhjdV-pwMOb7HIHkZi2OqyXWk0ulCPWu The videos related to statistical mechanics start at w8l3 and end at w10l1 in which low- and high-temperature approximations of the grand potential are discussed.
Cool! Are those lines/ blocks caused by rolling shutter?
You have a beautiful singing voice
Truly, a beautiful graph. 10/10, would derive period again.
Lovely 😍💋 💝💖❤️
you can hear a cat meow at 19:21
Awesome demonstration!!
WOW
Why is it that the particles in the final graphs that were the furthest distance away scattered at the steepest angles, rather than the particles that approached closest (and therefore experienced the strongest repulsive force)? Or is that just because the constants selected for m,q,l etc. were not the same?
Good question. Those plots were made by setting ml^2/(keQq)) = 1 meter for all of the curves. The only difference between each of the lines is the value of theta_0 chosen. However, the angular momentum per unit mass l is equal to v_0 times b where v_0 is the initial speed of the alpha particle and b is the impact parameter. For the red curve b is large therefore, to maintain a constant value of l, the particle's initial speed is small. For the cyan curve, the opposite is true. The impact factor is small, therefore v_0 is large. The differences in initial speed have a large effect on the shapes of the curves.
Big fan of the online lectures
Thanks! I like it too.
I really appreciate that you chose to make your lectures RUclips videos. I find it very helpful to be able to go back through the lecture to listen to you explain a concept. Thank you for transitioning online so smoothly!
Gonna miss that left hand :(
You can hear is cat meow at 15:09
Whos here cuz of JLZ?
You are doing great at transitioning to online!
The best out of any of my professors!
Thanks for the encouraging words! I'm now a "RUclipsr" out of pure necessity.