PHI 203 Final: PHYS 203 Princeton Final2004

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turquoisegnu128

31 Jan 2019

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A ball of radius a and density b is suspended under water (density. W) on a massless string of length l. you can assume that a<

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<p>An Iron ball suspended by a thread of negligible mass from an upright cylinder that floats partially submerged in water (so its basically an iron ball hanging from a string attached to a bottom of a soup can that is floating upright in water). The cylinder has a hieght of 6.00 cm, a face area of 12.0 cm^2 on the top and bottom, and a density of 0.30 g/cm^3, and 2.00 cm of its height is above the water surface. What is the radius of the iron ball?</p>

Suppose you touched a pith ball suspended from an insulating stringto a charged Teflon rod. You then made a second pith ball touch thefirst one with no other objects near by. You then put the top ofthe strings next to each other as shown at right. The two pithballs would be separated by 2 cm. The mass of each pith ball is 0.1g and the length of each of the string is 20 cm. (ignore the massof the strings)

a) What is the magnitude is the electrostatic force on one of thepith balls? You can assume that angle with vertical is small sothat sinÎ â Î.

F = ___________N (For this problem I dont understand how to set itup because I do not think that I know the q value so I cannot seehow to do the calculation)

b) Assuming the two balls are point charges at the end of thestrings calculate the magnitude of the charge on one of theballs.
Q= ______________ C

PHI 203 Final: PHYS 203 Princeton Final2004

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