russ_watters's latest activity
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russ_watters replied to the thread Li-Ion Battery Quality Report.That's interesting but there are a bunch of no-name 1.5V AA rechargeable Li-Ion batteries/chargers for sale on Amazon. Any thoughts on... -
Erm... As far as I know there is just no suitable Li-based chemistry for the usual voltages associated with the AA format.
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Erm... That's a bit different. Li-ion cells (rechargeable) works around 3.7V Standard AA (Zinc-Carbon, non-rechargeable) is around 1.5V...
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russ_watters replied to the thread Li-Ion Battery Quality Report.I'd been thinking of buying a new charger and batteries for AA devices. Looking online, it doesn't appear that any major manufacturer...
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russ_watters reacted to DaveE's post in the thread Undergrad Why is SI taught in US university physics courses instead of cgs? with
Like.
Because cgs sucks? Sorry, JMHO. STEM students need to know about unit conversions, which they will do while they are cursing the authors... -
russ_watters reacted to haruspex's post in the thread Undergrad Why is thermal energy treated differently than other kinds of energy? with Like.
Clearly that is not the case. If you were to place two inert bodies in contact and observe the result that the warmer body grows warmer...
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russ_watters reacted to jbriggs444's post in the thread Undergrad Why is thermal energy treated differently than other kinds of energy? with Like.
Agreed. I like to point to Newton's original text from time to time. The second part is the one that really resonates with me. In...
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russ_watters reacted to Herman Trivilino's post in the thread Undergrad Why is thermal energy treated differently than other kinds of energy? with Like.
When Newton wrote about action and reaction he was referring to forces. It was the 1680's. The concept of energy, if it even existed at...
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russ_watters reacted to jbriggs444's post in the thread Undergrad Why is thermal energy treated differently than other kinds of energy? with Like.
Newton's third law is all about momentum. It amounts to a statement that momentum is conserved. Newton's third law has less to do with...
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russ_watters replied to the thread New member seeking expert advice in particle physics.I will say this though: Unfortunately that sounds like exactly what you fear it is. That's what you are going to get most of the time...
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russ_watters replied to the thread Don't waste your money on organic food.Old thread, but in the US "Certified Organic" is an FDA/government certification. So complaints about bad government regulation as a...
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russ_watters reacted to haruspex's post in the thread Undergrad Why is thermal energy treated differently than other kinds of energy? with
Haha.
Not sure what Newton III has to do with energy. Please elaborate. Thermal energy is just disordered kinetic energy. Can you be more... -
russ_watters reacted to mfb's post in the thread Undergrad Why is thermal energy treated differently than other kinds of energy? with Like.
I have no idea how to parse this run-on sentence. What is your question? That's a statement about forces, not energy. Different from...
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russ_watters reacted to Greg Bernhardt's post in the thread Li-Ion Battery Quality Report with Like.
Given the fire risk of lithium, there is little reason to go cheap.
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OK, I guess I'm only buying name brand batteries now. Lumafield makes CT scanners for industrial engineering and production testing...
