Two identical small insulating balls are suspended by separate 0.26-m threads that are attached to a common point on the ceiling. each ball has a mass of 7.75 10^-4 kg. initially the balls are uncharged and hang straight down. they are then given identical positive charges and, as a result, spread apart with an angle of 35° between the threads. (a) determine the charge on each ball. (answer in c)

charge on each ball is 8.07 *10{-8} C

Explanation:

given data:

L = 0.26 m

m = 7.75 *10^-4 Kg

let charge on each ball  is q

let tension in the string is T

so force will be

T\times cos(17.5) = mg

                                    ----(1)

---(2)

solving 1 and 2  for Tension T  and charge  q   we get

T = 0.00796 N

charge on each ball is 8.07 *10{-8} C

this one:

as we gain mass the force of gravity on us increases.

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wavelength divides in half and speed stays the same.