Recent content by Taulant Sholla

How does PF not encourage volunteers to not engage in a pleasant and respectful manner? I mean, look at the vitriol you're expressing here. How is this allowed? I volunteer as a homework helper for other subjects. I regard my students as my customers despite the fact I'm the one helping them. I...

First, don't worry about quoting sections; simply reference the numbering shown in the image. This is a much more efficient approach v. cumbersome typing/equation editing. You should accommodate alternative presentation approaches; don't require others to adhere to your particular style. Be...

I got the correct answer (according to the textbook) using dynamics (steps 1-8 in blue as shown in the attached image). I get a different answer using work-kinetic energy theorem (steps 1-7 in green as shown in the attached image). Where am I going wrong?

Ah, yes - I see. Thank you so much for your help!

I can find angle a and angle b. Despite this it seems I still can't find x from equations 2, 3 and 4.

Here's my work based on using the COM as my axis of rotation. It seems I can't solve for x this way?

If I choose my axis of rotation for torque analysis to be the left-end of the plank, I can get the correct results. If I instead choose the com point -- I run into a dead end. Is there a way of a priori knowing this would happen? Thank you.

Yes, students measure the experimental time constant and compare to the predicted value (based on LCR values given by an LCR meter) for a series of RL combinations based on 800- and 1600-turn coils and 5-,10- and 22-ohm resistors.

Thanks for your continued help! I'm traveling and have limited connectivity opportunities, hence the gaps between my responses. Here's the LCR meter we use: "Proster LCR Meter Capacitance Inductance Resistance Tester Multimeter Self-discharge with Overrange Display"...

They use an integrated lab management setup from PASCO. A single interface box provides signal generator output and inputs for various sensors. We can adjust several AC parameters, and can also specify sample rates for voltage and current sensors. We gather a graph like this (except we collect...

I'll try this - thank you. Learning a lot here.

This is a possibility, but right now students use an LCR meter to measure inductance and resistance, and use this as the basis for comparing experimental results to predictions. I like having them get hands-on experience with LCR meters and others devices as mush as possible.

I was thinking a greater time constant might yield better results between experiment and prediction. We do indeed get good results now using 800- and 1600-turn air core coils. Using any kind of core (laminated closed loop square core or laminated single-bar core) yields very inaccurate results...

Thank you for your very thoughtful reply! I've included an image of the coil and core we use below. For our RL lab, we simply use one coil, not the two as shown. Using a single 800-turn coil with the pictured closed loop core increases the inductance from about 10mH to 70mH. Not exactly sure...

Yes, inductance ranges from 10-40 mH, with time constants in the realm of 0.6-0.8 milliseconds. I had no idea these losses are so substantial! Thank you.