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Answer Key

Answer Key. 1. D 2. Ions: A, C, D, G, H Neutral atoms: B, E, F Same element: A and E Same mass: A and E; F and H Same charge: D and G (and all neutral atoms have zero charge) 3. D 4. A 5. Neutral 6. D 7. C 8. LB 1 and LB 2 9. LB 1 takes 12 J from each coulomb Current at A is 1.5 amps

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Answer Key

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  1. Answer Key 1. D 2. Ions: A, C, D, G, H Neutral atoms: B, E, F Same element: A and E Same mass: A and E; F and H Same charge: D and G (and all neutral atoms have zero charge) 3. D 4. A 5. Neutral 6. D 7. C 8. LB 1 and LB 2 9. LB 1 takes 12 J from each coulomb Current at A is 1.5 amps Current at D is 0.5 amps Current at G is 2 amps 10. Battery V = 14 V LB2 P = 8 J/C * 2 C/s = 16 J/s 11. Circuit 3 12. V2 = 6*1 = 6 V; V3 = 3 V. R3 = 3 V/1 amp = 3 ohms 0 J at point A (after LB1) 13. Balanced: A, B, C, D Graph H: total force is negative (speeding up, negative) 14. Unbalanced: C, D, E, F Total force in Graph D: negative (slowing down, positive) 15. Ftotal = m * a = 50 kg * (-3 m/s/s) = -150 N Ftotal = Fdog + F friction -150 N = Fdog + 20 N Fdog = -170 N 16. a = 20m/s/5s = 4 m/s/s Ftotal = m*a = 15 kg * 4 m/s/s = 60 N 17. Ftotal = -12 N + 4 N = -8 N a = Ftotal/m = -8 N/8 kg = -1 m/s/s Cart slows down because of friction

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