Recent content by Monkey D. Luffy

Oh okay i think I understand now! thank you so much you guys really were a huge help

So set M/V = M'/V' and solve for M'... Take 0- Xcm of the two circles / M-M' That works?

You need Mass and Volume So use mass and volume for the original and sub those into a density formula... subtract the one for the small circles?

Well there is density (but we do not know it...) I don't think there are any others (i am solely going off of the formula sheet given)

I have added the diagram with the OP. Will i have to change my approach now?

Question 27

Oh i see what you mean... the diagram next to the problem shows a 2-D Circle not a sphere yet the problem lists sphere... In that case i guess let's assume it was a typo and the original was a circle. If the answer is incorrect i should be able to follow the same format for the solution albeit...

Well then the mass should be M/16 if they are related to the area... How did you deduce that they are related though? Kind of lost there because I see how the radius is divided by 4 ( half way through the circle twice ) and then when squared is /16 but not how the mass is divided by 16 out of...

I'm kind of confused as to what it would be in relation to one another... But I am thinking since for the original circle it was mass M and radius R... It can be either the mass times the area (so M(Pi)(R^2)/16) Or since Radius is divided by 16 the mass can be divided by 16 as well... I'm...

A=(Pi)r^2 So I guess it would be... A= (Pi) (R^2)/16 ?

Is it maybe M/4 (Pi) R^2? I just multiplied the mass by the area of the small cavity

Is it maybe M/4 (Pi) R^2? I just multiplied the mass by the area of the small cavity

Homework Statement A sphere of mass M and Radius R had two spheres of R/4 removed. the centres of cavities are R/4 and 3R/4 from the centre of the original sphere (at x=0). what is the x coordinate of the centre of mass of this object? there is a drawing next to the question literally showing...

ah see i understand derivatives pretty decently and your links brought back some ideas i remember practicing in Grade 12 Calculus, but now its integrals and the notation that confuses me. for example let's say we have -pdV/T what does that notation mean? (Im just using an example we had in...

OHHH i see! thanks i see your way of doing it and it makes a lot more sense now! my only remaining question is why we take the derivative and set it to 0, like what does setting it to 0 have to do with anything? i have done optimization before but it was usually for a dog running on a beach then...