17_InstSolManual_PDF_Part10 - 17-10 Chapter 17 17.32 Set Up...

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17.32. Set Up: A proton has charge and mass Solve: (a) The gravity force is downward so the electrical force must be upward. An upward force from a downward electric field requires a negative charge. The charge is (b) 17.33. Set Up: Use the coordinates shown in Figure 17.33. Since the electric field is uniform, the force is constant and the acceleration is constant. and For an electron, and Figure 17.33 Solve: (a) and (b) Reflect: We could also use the work-energy theorem and set the work done by the force equal to the gain in kinetic energy of the electron. 17.34. Set Up: For a point charge, is toward a negative charge and away from a positive charge. Solve: (a) The field is toward the negative charge so is downward. (b) 17.35. Set Up: For a point charge, Solve: 0 q 0 5 Er 2 k 5 1 6.50 3 10 3 N / C 21 0.100 m 2 2 8.99 3 10 9 N # m 2 / C 2 5 7.23 3 10 2 9 C E 5 k 0 q 0 r 2 . r 5 Å k 0 q 0 E 5 Å 1 8.99 3 10 9 N # m 2 / C 2 21 3.00 3 10 2 9 C 2 12.0 N / C 5 1.50 m E 5 1 8.99 3 10 9 N # m 2 / C 2 2 3.00 3 10 2 9 C 1 0.250 m 2 2 5 432 N / C. E S E 5 k 0 q 0 r 2 . v y 5 v 0 y 1 a y t 5 0 1 1 2.84 3 10 14 m / s 2 21 1.5 3
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