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October 1, 2014

October 1, 2014

Posted by **Abi** on Saturday, April 30, 2011 at 7:56pm.

a) Determine the force of attraction between the larger and smaller balls that had to be measured by this balance.

b) Compare this force to the weight of the small balls.

Ok... so for the first one I have to use the equation given and change the values to kilograms and meters, and use the radii instead of the diameters, this is what I know, but I don't know how to do it when there are three spheres (the big one and the 2 small ones)... I don't get what they are asking for the second part...

Someone please help, it will be deeply appreciated...

Physics Urgent!! - bobpursley, Saturday, April 30, 2011 at 3:31pm

Double the force: you have two big ones, each pulling on one small

Sorry to repost this again but I'm still not clear... Ok, so I have r1= 0.0254m, m1=0.730283 kg, r2= 0.152m and m2=157.850 kg... I calculated

(6.674E-11)(0.730283)(157.850)/(0.152m-0.0254m)^2 and I got 4.77E-7 and multiplyed it by 2 and then I got 9.54 E-7... Does this looks right?

Is that for part A?

- Physics Urgent!!!!! -
**bobpursley**, Saturday, April 30, 2011 at 8:30pmI didn't punch it on the calculator. OK, on A) it asks (I think) for each force, do don't multipy by 2 .

- Physics Urgent!!!!! -
**Abi**, Sunday, May 1, 2011 at 2:00amBut I just have to plug in one number for part A that most be E-7 and for part B I have to plug only one number too that must be E-8.

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