berkeman's latest activity
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berkeman reacted to Baluncore's post in the thread A Reflections at the source point of a transmission line with
Like.
Reflections only occur where there is an impedance mismatch. If the source is matched to the line, then there will be no reflection at... -
sorry I didn't know that😅
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berkeman replied to the thread A Science Fanatic.Welcome to PF. :smile: In your future posts, please take care to translate them into English. Thank you. :smile:
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berkeman replied to the thread Hello from a Graduate Aerospace Researcher.Welcome to PF, @arafat :smile: Check out our Mechanical Engineering / Fluids forum and our Aerospace Engineering forum. You should...
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berkeman reacted to arafat's post in the thread Hello from a Graduate Aerospace Researcher with Like.
Hi everyone! I’m Arafat, a graduate researcher, with a focus on hypersonic aerothermodynamics and CFD. I joined PF to learn, exchange...
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berkeman reacted to BillTre's post in the thread Writing: Input Wanted Looking for story advice on ancient aquatic reptile breeding grounds with
Informative.
Not entirely clear on what you're after here. Nevertheless you may find some of this useful: Breeding grounds can persist for very... -
berkeman reacted to BillTre's post in the thread Share Animal Pictures: For Animal Lovers with Informative.
This sea slug (like many corals) can use algae they have incorporated into their skin to photosynthesize.
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berkeman replied to the thread Could the Laws of Physics Be Proportional to Entropy?.Thread is closed for Moderation.
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berkeman reacted to jrmichler's post in the thread HP Required to move a robot 10meters at 1.5m/sec with Informative.
You are correct. For moving 4000 lbs, you need some math. Here is how I solve this type of problem. Step 1: Sketch an acceleration -...
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berkeman reacted to Jeremy Sawatzky's post in the thread HP Required to move a robot 10meters at 1.5m/sec with Like.
Thank you very much, that is immensely helpful. I would probably plan for some decent headroom then, putting likely a 2.5 -3kw motor to...
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berkeman reacted to Jeremy Sawatzky's post in the thread HP Required to move a robot 10meters at 1.5m/sec with Like.
Thank you very much. - Post 4 does have some solid math. Unfortunately it is actually not up to me to purchase a gearmotor or servo, I...
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berkeman replied to the thread Writing: Input Wanted Looking for story advice on ancient aquatic reptile breeding grounds.Paging the obvious PF subject matter expert @BillTre (well, at least for current aquatic animals)... :smile:
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berkeman reacted to TSny's post in the thread I Gauss' law seems to imply instantaneous electric field propagation with Like.
Yes. Thank you.
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berkeman replied to the thread I Gauss' law seems to imply instantaneous electric field propagation.It looks okay now, right?
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