Thread: plz help to solve problem,not homework just curiosity

with this problem i hope to finally be able to relate angular versus linear momentum plz help to finish it

wow... the term Epic Fail springs readily to mind


what exactly are we supposed to be finishing you've given us a crudely drawn diagram with no form of question or unfinished equation or anything

Originally Posted by luxtpm

with this problem i hope to finally be able to relate angular versus linear momentum plz help to finish it

this sounds VERY much like you've just stuck some words from your lessons together even ignoring the fact that anyone who wants to 'finally relate' angular and linear momentum would know you can't relate the two since they are essentially identical and as far as I can remember Angular momentum doesn't even exist, it's just linear in lots of directions


your title sucks and is bloody awful grammer, I nearly instantly dislike anyone who uses 'textspeak' when asking for help, it's just plain rude, if you can't be arsed to use 6 letters instead of 3 I can't be arsed to help, and anyone who actually feels the need to tell people it's not homework is probably lying


So how's about you use correct english, tell us what your homework is in a clear way that lets us know what we are supposed to help with and show us what you've already done and maybe someone will help




P.S before I get some pompous ass telling me off, I do wonder what an aparently non homework question is doing with a note in the upper left saying one point excercise

its a joke made with paint, if you solve it you get one internet point

the cannon shoots a bullet of 1 kg at 1 m/s

what are the speeds achived by the 1kg cannonball and the united by a beam counterweight also of 1 kg all happening in empty space

if you dont understand something of the problem plz ask id like an answer

If the cannon, the cannonball, and the counterweight each has a mass of 1 kilogram, and the cannonball is launched at 1 m/s then we can use conservation of momentum to say that the center of mass of the cannonball-counterweight system is traveling at 1/2 m/s.

The cannon will initially recoil at 1 m/s, the center of mass will be 1/2 m/s and the counterweight stationary.

That is the answer to your question. You can also solve for the rotational speed of the cannon-counterweight system.

Later on, after the cannonball is fired, the cannon and counterweight will be spinning around the center of mass.

If the cannonball is 1 m horizontally from the center of mass of the cannon-counterweight system, then it has an angular momentum of 1 kilogram-meter^2/second clockwise relative to that point. The spinning cannon-counterweight system then must have a counterclockwise angular momentum of 1 kilogram-meter^2/second.

oh thanks a lot i see it now