# chrismohr

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1. ## Iron microspheres

What process is involved in creation of iron oxide spheres in fly ash (residue from coal burning)? At what temperatures? Do microspheres get created which are reduced to elemental iron in any other process, and if so, at what temperatures can this happen? Thank you!
2. ## Iron oxide reduction

Here are my general questions about rust: 1) The melting point of iron is around 2750 F. But at what temperature can small or nano-sized iron oxide flakes "melt" when they are released into the air? 2) When this happens, at approximately what temperature can iron oxide reduction to iron begin to take place? Are there relatively simple ways for to make iron oxide reduce to iron or does this happen only when the temperature exceeds 2750 F (iron's melting point)? 3) At what temperature can small or nano-sized rust flakes reduce to iron and turn into small spheres? Are iron-rich microspheres a byproduct of regular fires at under 2200 F or are they unique to super-hot fires above 2750 F? Thank you!
3. ## question re f=ma/weight

I have a few rough figures I'm pretty confident of with this poor bowling ball. In one second the ball would drop about 30 feet and be going 22 miles per hour. By the next second it would be going 45 mph and would have dropped about 90 feet. So with this information, can anyone actually calculate the force in Newtons of a 10 lb bowling ball dropping at 1 mph, 22 mph and 45 mph? Let's assume the spring-action scale has long ago been crushed and now we are just calculating force in Newtons. This would give me an actual answer I could use. Thanks again everyone, I can't believe all the responses this has generated so far.
4. ## question re f=ma/weight

Hi all, Wow this really is complicated. Thanks all for the answers so far. At first I thought the answer would be simple to create: what weight would a scale show if a 10-lb bowling ball were dropped from 13 feet? Is there a better way to frame this question? Let me try. What are the differences in force exerted between a ten pound bowling ball dropping at 1 mph, 22 mph, and 50 mph? Would the force be measured in joules or how? I just want to find some kind of force ratio here. Thanks again all, Chris Mohr
5. ## question re f=ma/weight

OK, OK, but can anyone give me an estimate of what this 10 pound bowling ball would weigh when dropped 13 feet onto a scale that didn't have much spring in it? I don't need an exact answer, just a close approximation. Thanks, Chris Mohr
6. ## question re f=ma/weight

Hi all, This is my first post. I'm a 56 year old guy (not a student) and I don't know how to apply the f=ma formula to solve this question. If a 10-pound bowling ball is sitting on a scale at sea level it would weigh ten pounds. What if that same bowling ball were dropped from a height of 13 feet onto the scale? If it were a bathroom scale it would probably crush it, but if the scale were strong enough, what weight would the scale show if it were able to adjust instantly to the ball hitting it? I'm assuming no wind resistance so the ball is dropping at 9.8 meters/second squared. Could you demonstrate how you came up with the answer too? Thanks! Chris Mohr Casual Science hobbyist
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