246 reputation
15
bio website cashcommons.com
location Virginia
age 42
visits member for 3 years, 11 months
seen Aug 27 at 18:06

Scientist and software developer by day, blogger and OSQA site owner by night. Check out Cash Commons for any and all questions about money.


Aug
21
comment How to calculate electric force between two tubes?
Are the two rods identical? (Same $\lambda, l, r$?) Are there any simplifying assumptions as to how they're positioned and oriented with respect to one another?
Feb
11
awarded  Commentator
Feb
5
awarded  Supporter
Jan
29
answered Rigid body problem
Jan
17
answered How long will it take to fill a bath tub with oil compared to water?
Aug
23
comment What is the difference between translation and rotation?
Motion of what? A book? A protein molecule?
Nov
22
awarded  Yearling
Nov
21
comment Confused about unit of kilowatt hours
This sounds more like an engineering question that you're dealing with. Physics looks more at the basics so you'll be applying engineering principles to get the performance you need. It sounded like from your comments that you were needing more understanding of what exactly a kWh was. Anyway, good luck!
Nov
21
comment Confused about unit of kilowatt hours
It's a matter of capacity. A battery (or fuel cell) only has so much capacity for pumping electrons into something to power it. If you expect to power something for longer, all other things being equal, you'll need a bigger fuel cell.
Nov
21
comment Confused about unit of kilowatt hours
24 kW (in simple terms) means that you can handle a 24 kW load. Like a water heater, electric stove, five microwaves, and 600 feet of incandescent Christmas lights. If you wanted to power all of that stuff for a full day, you'd need about 576 kWh of energy to do that. Now, it's a bit more complicated than that, because we're not considering the efficiency, or how many phases your fuel cell has, whether you're converting to AC or not, etc.
Nov
21
answered Confused about unit of kilowatt hours
Nov
21
revised Vector Nature Of Angular Velocity
added 36 characters in body
Nov
21
answered Vector Nature Of Angular Velocity
Aug
19
awarded  Editor
Aug
19
revised Finding shortest possible rotation period
minor spelling changes
Aug
19
suggested suggested edit on Finding shortest possible rotation period
Apr
14
comment Temperature vs AC energy consumption
@Georg: Debate is fine. I'm here to learn as well, and arriving at the correct answer is more important to me than the site reputation. I admit that my answer wasn't particularly complicated and I didn't consider at all the mechanics of the cooling. So there certainly could be a more complete answer.
Apr
13
comment Temperature vs AC energy consumption
@Georg: Good point. But isn't the efficiency difference only about 5% over the range of temperatures we're talking about?
Apr
13
answered Temperature vs AC energy consumption
Nov
20
answered Escape velocity from long ladder