Appendix J Selected Answers

Answers to even-numbered Math Practice and Section Assessment questions that involve calculations are given below. Use these answers to check your work.

Chapter 1

Math Practice, page 15

• 2. $\mathrm{Distance} = 2.6 \times {10}^{13} \mathrm{m}$

Section 1.3 Assessment, page 21

• 8. $1.5 \times {10}^{-4} {\mathrm{cm}}^3$

Chapter 3

Math Practice, page 80

• 2. T₂ = 580 K

Section 3.2 Assessment, page 81

• 10. P₂ = 281 kPa

Chapter 6

Math Practice, page 174

• 2. Cu₂S

• 4. sodium hydroxide

Section 6.3 Assessment, page 175

• 8. lithium chloride, barium oxide, sodium nitride, lead sulfate

• 10. K₂S

Chapter 7

Math Practice, page 195

• 2. $2{\mathrm{H}}_2{\mathrm{O}}_2 \to 2{\mathrm{H}}_2\mathrm{O} + {\mathrm{O}}_2$

• 4. $\mathrm{Mg} + 2\mathrm{HCl} \to {\mathrm{H}}_2 + {\mathrm{MgCl}}_2$

Section 7.1 Assessment, page 198

• 10. $2\mathrm{Mg}+{\mathrm{O}}_2\to 2\mathrm{MgO}$

Chapter 10

Math Practice, page 295

• 2. ${}_6{}^{14}\mathrm{C}\to {}_7{}^{14}\mathrm{N}+{}_{-1}{}^0\mathrm{e}$

• 4. ${}_{38}{}^{90}\mathrm{Sr}\to {}_{39}{}^{90}\mathrm{Y}+{}_{-1}{}^0\mathrm{e}$

Section 10.1 Assessment, page 297

• 10. ${}_{88}{}^{226}\mathrm{Ra}\to {}_{86}{}^{222}\mathrm{Rn}+{}_2{}^4\mathrm{He}$

Chapter 11

Math Practice, page 333

• 2. v = 62 km/h

Math Practice, page 346

• 2. $(v_{\mathit{f}}\mathit{ }\mathit{-}\mathit{ }{v}_{\mathrm{i}}) = 36 \mathrm{m}/\mathrm{s}$

• 4. v_i = −25 m/s

Section 11.3 Assessment, page 348

• 8. a = 0.83 m/s²

Chapter 12

Math Practice, page 367

• 2. a = 2 m/s²

• 4. m = 50 kg

Section 12.2 Assessment, page 369

• 6. Deceleration = 11 m/s²

Chapter 14

Math Practice, page 415

• 2. Power = 7.5 W

Section 14.1 Assessment, page 416

• 8. Power = 50 W

Math Practice, page 425

• 2. IMA = 10

Section 14.3 Assessment, page 426

• 8. Efficiency = 80%

Chapter 15

Math Practice, page 448

• 2. 440 kJ

Section 15.1 Assessment, page 452

• 8. PE = 44 kJ

Math Practice, page 458

• 2. PE = 2100 J; v = 7.7 m/s

Section 15.2 Assessment, page 459

• 10. h = 0.20 m

Chapter 16

Math Practice, page 477

• 2. Q = 34 kJ

• 4. ΔT = 10.0°C

Section 16.1 Assessment, page 478

• 10. Q = 7.8 kJ

Chapter 17

Math Practice, page 506

• 2. Speed = 0.4 m/s

• 4. Wavelength = 0.5 km

Section 17.2 Assessment, page 507

• 10. Period = 0.5 s

Chapter 18

Math Practice, page 535

• 2. Wavelength = 440 m

Section 18.1 Assessment, page 538

• 10. Wavelength = 0.190 m

Chapter 20

Math Practice, page 611

• 2. I = 0.32 amps

Section 20.3 Assessment, page 613

• 8. I = 0.85 amps

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