# Search results

1. ### Energy conversion- burning wood to lifting an object

Yes, it seems reasonable. That's the problem with heat - there's a whole lot of it, but we can utilize only small fractions to make it do what we want.
2. ### Gravity Qustion

Approximately 8 minutes. Gravitational disturbances travel at the speed of light. The sun is 93 million miles away. This, divided by c (the speed of light) gives a time of around 8 minutes.
3. ### Likelihood of making a career out of clean energy?

Well, the RCE degree actually is a MSME, just with a concentration on renewable energy technology, such as solar panel and wind turbine efficiency.
4. ### I am want become a Scientistplease guide me

Well, fortitude, it's going to be tough. Even under the best of circumstances, a natural sciences degree takes a great deal of effort, and higher math is always involved at some point. If you feel like you can rise to the challenge - especially considering the additional difficulties you face...
5. ### Likelihood of making a career out of clean energy?

So, here's the situation: I'm a second-year engineering student at a not-exactly-prestigious school (Wright State University for the morbidly curious), and my current plan is to carry my education all the way through to a Master of Science in Renewable and Clean Energy. Do you really think...
6. ### Distance without time?

Well, as sophiecentaur said, of course we can consider distance separately from time, but that wasn't the question. The question is whether or not it is possible for one to exist and not the other.
7. ### Distance without time?

Sorry, I misunderstood what you said. I'm not entirely sure it's meaningful to assign a rate to time at all, so to say it can pass with a certain speed is sort of playing fast and loose with the underlying concepts. I think of time as more of a continuum that can be stretched (slowing down)...
8. ### Distance without time?

But it wouldn't have to move at infinite speed. Due to relativistic effects, it would only have to travel at the speed of light. (And by the way, I didn't say that travel would have to occur, just time would be sped up to the point where instantaneous travel would be possible. :wink: )
9. ### Distance without time?

OK, so let's run that thought experiment. Say we want to speed up time to the point where travel is instantaneous. Is it meaningful to have instantaneous travel with nonzero distance?
10. ### Distance without time?

If you can show an example of an object travelling a specific distance in no time (blithely putting relativistic effects to the side), then you will have shown that time and distance aren't related. In both of those cases, you have an object travelling a distance over a time interval.
11. ### Distance without time?

You're not the only one. :confused:
12. ### Distance without time?

I don't think the poster fully understood what you meant, and so deleted his post.
13. ### Ok really dumb hypothetical nearly impossible question

I assume you mean a 287 TeV lead ion beam, a la the Large Hadron Collider? Well, I wouldn't recommend standing in the way of it, if you catch my drift. That much energy requires an awful lot of speed behind it.
14. ### Distance without time?

General relativity says no, you cannot have one without the other. They are deeply interwoven at a fundamental level.
15. ### I don't understand work

That was sloppy wording on my part and I apologize (although that would be a nice segue into a conversation about impulse and momentum ...) Anyway, at the end of the day what you should realize is this: work done is a measure of how much energy is added to an object by a force that causes it...
16. ### Stuff, Space, and Motion

Well, you've forgotten to account for time. Sure, stuff needs space to move around in, but if we're all stuck in the same moment of time, it's unlikely to be going very far.
17. ### I don't understand work

I understand your frustration. In fact, I shared it at one point. Believe it or not, even advanced physicists didn't just come out of the womb knowing this stuff. ;-) As to your question: I'm going to start at the very beginning, since I think that's what you're really after. When we...
18. ### Work done lifting a chain

That result really makes no sense to me. I can figure out the math, I guess, but I can't see the physics in it.
19. ### Work done lifting a chain

OK, so \int_0^{30}(40 - y)dy
20. ### Work done lifting a chain

Upon revising, I ended up with 900 + 3\int_{10}^{40}(30 - y)dy Does this look a little better? (Also note that the assignment is to find the integral, but not to work it out.)
21. ### Work done lifting a chain

Homework Statement A chain 40 feet in length and weighing 3 pounds per foot is hanging fully extended from a winch. Find the work done by the winch in winding up 30 feet of the chain. Homework Equations Typical segment of the chain: \Delta y_{i} Weight of typical segment of the...
22. ### Stupid question about Newton's third law

You know what's messed up? That same thought occured to me, and I asked my teacher about it. He waved me off and told me I was wrong. So you're saying that you push down on the floor with the same strength that the floor pushes back on you - the normal force?
23. ### Stupid question about Newton's third law

Er ... your force on the floor equal to your actual weight, and the force of the floor pushing back on you, equal to your apparent weight?
24. ### Stupid question about Newton's third law

OK, first of all, I wasn't really sure where to post this; it's not really homework because we covered the material weeks ago and moved on, leaving me totally in the dark. My physics teacher has this annoying habit of saying something is "ALWAYS true" or "NEVER true" and then beginning the next...