Recent content by curt2121

yes looking at it, that's what I'm going to do i think. this afternoon is crunch time for me to get down to it or i owe him lunch on friday. oh well, I'm still ahead in total since I usually get him with bio puzzles

now that I'm thinking, i hope i explained the problem right from the beginning. the rod isn't rotating about itself, ir's simply on a surface, say a desk and allowed to plop over to horizontal. does all this adding the moments of inertia still apply?

that last part abotu the length is correct. i don't remember ever hearing anythign about the parallel axis problem before. Well, it's possible i learned it as a different name. can you please enlighten me? edit: just looked it up on wikipedia but I definitely don't understand the explanation...

well yes that part is true, but the stream of water seemed to get wider as the height increased. why is that?

so that the total moment of inertia is 2/5*2*R(radius of large mass)^2 +2/5*1*r(radius of small mass)^2, + 1/12*1*L^2= 4/5R^2+2/5r^2+1/12L^2? then assuming the top and bottom masses have the same density, the volume of the top is half the volume of the bottom so that the radius of the...

am i on track with that cm? and I'm not quite sure how to combine the moments of inertia of the different objects

from looking at the problem, i think it's safe to model the top mass as a point since it is fixed, but the bottom has to be spherical, that's the whole trick to it. I'm attaching a diagram for those visual learners. i know (at least i think if I remember right) the center of mass is: cm of...

so i was watchign a water fountain during a rally here today and was watchign the fountain in the middle and was wondering why (physically) when the water reaches the top it begins fallign in such a wide pattern. it makes sense to me intuitively but i don't know enough about physics to know just...

ok I'm not quite sure how they're all supposed to fit together

for some reason i keep wanting to include the moment of inertia for the sphere (.4MR^2) since the base will have to roll over. Am I completely off on that? help is much appreciated since i'll have to take him to lunch wednesday if I don't figure it out

um not really sure why this was moved since it isn't for a class but ok I guess. anyone knw of a solution?

well the speed would be in terms of the length I'm assuming

a 1kg rod of unknown length has a spherical base with a mass of 2kg and a mass of 1kg on the top. if it is allowed to fall over from vertical, what will the velocity of the 1kg mass at the top be when it falls down (no friction). a friend is driving me crazy with this since i gave him a little...