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Introductory Physics Homework Help
How Many Electrons Are Needed to Accelerate Two Charged Spheres at 25g?
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[QUOTE="flynnk567, post: 4498568, member: 389421"] I know almost this exact thing has been asked before but even after looking at the other posts I still can't figure out what I'm doing wrong. [h2]Homework Statement [/h2] Two very small 8.05-g spheres, 11.0 cm apart from centre to centre, are charged by adding equal numbers of electrons to each of them. Disregarding all other forces, how many electrons would you have to add to each sphere so that the two spheres will accelerate at 25.0g when released? [h2]Homework Equations[/h2] F=ma F=k(q1q2/r^2) q=ne [h2]The Attempt at a Solution[/h2] F=ma=F=k(q1q2/r^2) F= (8.05g)(25)(9.8m/s)=1972.25 1972.25(.11m)^2=(8.987e9)Q^2 (23.86)/(8.987e9)=Q^2 Sqrt(2.66e-9)=Q 5.15e-5=Q Q=ne n=5.15e-5/1.6e-19 =3.22e14 electrons [/QUOTE]
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How Many Electrons Are Needed to Accelerate Two Charged Spheres at 25g?
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