Simon Bridge said:If you really have no idea at all, then you need to review your course notes, a text, and maybe googling the subject you just covered in class.
So what determines how much of an object floats above the water?
The object is not completely floating 2 cm of it is submerged in water and that submerged part has the thread that connects the ball to the objectSimon Bridge said:An object will float if the mass of fluid displaced is equal to the mass of the object. This is called "the principle of Archimedes" and you should memorize it.
... in this case you have a composite object.
The mass of an object is it's volume times it's density.
You know an equations for the volumes of various geometric objects.
I have solved it thank you I just re arranged some formulas and it worked like magic this is physics I guessSimon Bridge said:An object is either floating or it isn't. There is no "completely".
All floating objects are at least partly submerged - it is also possible to float when completely submerged.
The principle of Archimedes works for anything that floats ... everything else sinks.
So you also need to realize that a sunk object, that is not being supported, displaces it's own volume of water. All this should be in your class notes.
You know equations for the volumes of objects ... i.e an object with cross-section area A and height H has volume AH if that object has density p, then it's mass is pAH ... see how I did that?
Do you know the formula for the volume of a ball with radius r?