I've been staring at this problem for 4 hours now... reading all through my book and really don't even know where to begin... I know there are a lot of engineers on these forms so I'm hoping someone can help me with any info! TIA
Physics Question Help Needed!
- Thread starter ShroomMastap
- Start date
wish I could help. I had to take physics in university as part of my biology degree but I haven't even thought about it since 1997..this makes me realize why I haven't thought about it 
Wow, glad I took integrated Chem/Phys. instead of just plain chemistry or physics. I've heard both are really hard classes, but I sleep through ICP and have a C right now. 
i saw this and got excited because i thought i could solve it (gosh that sounded nerdy), but this is a little more advanced than my high school physics class...
Gearhead;4585957; said:Silly nerd, physics is for smart seniors.
haha sorry that i go to highly academic private school and have an interest in science
I am very good in science also, I just choose to sleep during my 6th period. My science teacher last year was a fish club president and attended the catfish gathering last weekend. I get free fish all the time.
Gearhead;4585973; said:I am very good in science also, I just choose to sleep during my 6th period. My science teacher last year was a fish club president and attended the catfish gathering last weekend. I get free fish all the time.
thats awesome... i take it you were in bio last year? pshh i took honors bio freshman year
(i know, i know, nerd) boy are we derailing this... sorry op
Earth science, but still, I'm not going for any honors diploma or anything, just graduation. I'm actually in a career school for welding. Mr. Fleck has a 24' diameter pool that he breeds natives in during the summer. He has over 100 tanks in his basement. He's my favorite teacher, obviously.
Anyway back on topic. Sorry to hijack your thread, good luck.
Anyway back on topic. Sorry to hijack your thread, good luck.
It's been a few years (ok, decades), but here's how I would tackle it...
Conservation of energy is the main rule.
Initially, ball has 0 kinetic energy, and lots of potential energy. By dropping to lower height (h), its potential energy drops (by E=mgh), which means its kinetic energy must rise by E=m(v**2)/2. So that gives you its velocity, v, at time of contact with rod.
From there, the moment (ie, torque) around O is next to be preserved. Compute the sum of the 2 moments (rod, ball) and calculate how much momentum is generated by that same kinetic energy. At the far end of the pendulum swing, it has velocity of 0,
so its kinetic energy = 0, but its momentum is now all converted to potential energy (ie, height diff), so that gives you its MAX height from floor. And since (d-MAX) is proportional to the sine of that angle, you know theta. The I forget the momentum formula, but it was something rather like (mass * dist).
Good luck with that.
Conservation of energy is the main rule.
Initially, ball has 0 kinetic energy, and lots of potential energy. By dropping to lower height (h), its potential energy drops (by E=mgh), which means its kinetic energy must rise by E=m(v**2)/2. So that gives you its velocity, v, at time of contact with rod.
From there, the moment (ie, torque) around O is next to be preserved. Compute the sum of the 2 moments (rod, ball) and calculate how much momentum is generated by that same kinetic energy. At the far end of the pendulum swing, it has velocity of 0,
so its kinetic energy = 0, but its momentum is now all converted to potential energy (ie, height diff), so that gives you its MAX height from floor. And since (d-MAX) is proportional to the sine of that angle, you know theta. The I forget the momentum formula, but it was something rather like (mass * dist).
Good luck with that.