Recent content by golfrmyx

I read the article a few days ago soon after it was published by the Washington Post. Very fascinating and interesting to study. I have done study on bicycles and motorcycles myself on a small scale and knew about most of what is in the article. Riding motorcycles at a high speed around a curve...

Water pressure is very strong. Thus, friction to stop it from bypassing bubble has to be strong also. I published my response without showing concern for a "lighter than water" bubble as if it would not make much difference to see what kind of response that would get. But, if a bubble with a lot...

Gloo touched on friction of the "bubble" moving in assumption 5. Friction has to be considered for it. That friction will keep the bubble from allowing the water to equalize in both columns. Also, the density of the bubble will make a difference though gloo stated it boyuant. If it is lighter...

mfb, I see my comment was not clear for some reason. The gold friction on the sloping surface would be more than that of glass that is more than plastic. The increased friction I was referring to would be the air resistance that is too large to ignore. I do not mean increased. Not sure why I...

I guess you replied to a reply of mine to another poster and I did not recognize that since the system does not show who the replies are to.

A little confused because you are now communicating under a different name. Does not matter, Assume associate. My education is old and not a complete college degree. But, I do know and used extensive math on several different professions. Know nothing of Lagrangian and never learned the complete...

Post #3 does not have a picture. Thus, angle to what? Horizontal radian at point of release? Or vertical radian? An angle of 2 what then? 2 degrees above or below horizontal or what?

Huh? Point mass m moving toward center of hoop? Impossible. It is on a surface strong enough to keep it on the circumference of the hoop until it falls away from the hoop outer surface. The hoop is in motion toward the direction point mass m is effectively pulling it by pushing with gravity...

Very good answer but you left two components out. One being the friction of the hoop M on the surface it is rolling on that I assume you consider also zero and the other being the friction holding the "point object m" to the outer surface of M which is important. Consider for comparison if the...

He did not ask for the angle of leaving. He asked for the point of leaving. Either way, I am betting your answer is wrong.

I did not reply or add the "Then you have to factor in the initiating force of push off." Do not know how that got there, copied from an above answer. The friction would not be the same as the weight of gold increases friction in contact with sloping surface. Gravitational pull on heavier gold...

There is no answer to a problem with infinity of variables. The variables must all be stated and known. This problem states some of them but not all. However after sleeping on this problem and giving it a lot of thought, my opinion is that the object m, regardless of all variables, will depart...

Friction. Surrounding atmosphere and surface rolled on. Go get your marbles and give them a try. A steel one against a glass one and perhaps a plastic one will give you a close enough answer.

definition semantics. do not drive yourself crazy.

A gold marble will roll faster down a 10 degree slope than a glass marble of the same diameter. Also consider, if mass m is placed exactly on the top of the arc of hoop M, it will not start rolling. Then you have to factor in the initiating force of push off.