Question Be sure to answer all parts. Calculate the velocity (in m/s) of a 0.332

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Question Be sure to answer all parts. Calculate the velocity (in m/s) of a 0.332-g object that has Ek-167 J. m/s Determine which of the following pairs of charged particles has the greater electrostatic energy between them: charges of +1 and -2 separated by a distance of or charges of +2 and -2 separated by a distance of 2. Select the single best answer. A. charges of +1 and-2 separated by a distance of d have greater energy 2 and -2 separated by a dis tance of 2d have greater energy B. charges of + C. both pairs have equal energy

Explanation / Answer

Ek = (1/2) m v2

v = sqrt (2 Ek /m)

given that Ek = 16.7 J

m= 0.332 g = 0.332 x 10-3 kg

v = sqrt ( 2 x 16.7 /0.332 x 10-3 = 317.17 m/s

Part B

Energy = a constant x q1q2/r

where q1 and q2 are charges and r is the distance between them

First case energy = -2 costnt/d

second case

energy = -4 constant/2d = 2 constnt/d

Thus option 3 is the correct answer, both the pairs are having same energy.

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