Could i get some assistance with these questions ? Thank you.

Numbers (4,6,7,8).

Assess your understanding by trying some or all of these problems. Answers are included. Don't forget to use the MODEL-VISUALIZE- SOLVE-ASSESS problem-solving process! 1. (Knight Problem 22.3) A plastic rod that has been charged a. What is the electric force on a proton 2.0 fm from the to -15 nC touches a metal sphere. Afterward, the rod's surface of the nucleus? [Answer: 5.0 x 107 N.] charge is -10 nC. b. What is the proton's acceleration? [Answer: 3.0 x 1029 a. What kind of charged particle was transferred between m/s'.] the rod and the sphere, and in which direction? That is, did Hint: Treat the spherical nucleus as a point charge. it move from the rod to the sphere or from the sphere to the rod? [Answer: Electrons transferred to the sphere.] 6. (Knight Problem 22.41) What is the force F on the -10 nC b. How many charged particles were transferred? [Answer: charge in the figure below? Give your answer as a magnitude 3.1 x 10 0. ] and an angle measured cw or cow (specify which) from the +r-axis. [Answer: 4.3 x 10 8 N, 730 cow from the +r-axis.] 2. (Knight Problem 22.13) Two 1.0 kg masses are 1.0 m apart (center to center) on a frictionless table. Each has +10 mC -15 nC of charge. 5.0 nC 3.0 cm a. What is the magnitude of the electric force on one of the masses? [Answer: 0.90 N.] 1.0 cm b. What is the initial acceleration of this mass if it is released and allowed to move? [Answer: 0.90 m/s2.] -10 nC 3. (Knight Problem 22.17) What is the net electric force on charge A in the figure below? [Answer: 0 N.] 7. (Knight Problem 22.43) What is the force F on the 5.0 nC charge in the figure below? Give your answer as a magnitude and an angle measured cw or cow (specify which) from the 1.0 nC -1.0 nC 4.0 nC +r-axis. [Answer: 2.0 x 10 * N, 45' cw from the +r-axis.] A(+ B- 1.0 cm 1.0 cm 10 nC 3.0 cm 4. (Knight Problem 22.19) What is the force F on the 1.0 nC 4.0 cm charge in the figure below? Give your answer as a magnitude and a direction. [Answer: 3.1 x 10-4 N, upward.] 1.0 nC 5.0 nC -5.0 nc 1.0 cm , 1.0 cm 8. (Knight Problem 22.49) Charge q2 in the figure below is in 60 60 equilibrium. What is q1? [Answer: -20 nC.] 2.0 nC 1.0 cm 2.0 nC 5.0 nC + 5. (Knight Problem 22.37) The nucleus of a 12Xe atom (an isotope of the element xenon with mass 125 u) is 6.0 fm in 10 cm 10 cm diameter. It has 54 protons and charge q = +54e