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Page ID: 24219

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An italic page number refers to a problem on that page.

A Writer’s Time xvi

a₀

see Bohr radius

absolute value 187, 247, 248, 302, 314

absolute zero 182, 300

abstractions as formula structure 133

as naming 27

atomic constants 179

barrier 60

capacitive impedance 299

characteristic (typical) value 203

concentration gradient 265

diffusion constant 251

dimensionless groups 144

fluid 28

for simplifying equations 130

fostered by words 331

fostering insight 33

Gm 154

higher level 313

ideal spring 317, 353

in easy-cases analysis 280

in operating systems 54

ladder 39, 43

less-correlated quantities 273

place value 28

power mean 313

Reynolds number 162, 295

thermal conductivity 266

transferable ideas 74

voltage dimensions 168

acceleration 37, 173

relativistic 174

accuracy 89, 201

more than deserved 91

proportional reasoning 118

acoustic charge

see charge, acoustic

acoustic field 331

acoustic source strength 335

actin 205

adding in quadrature 251

adiabatic atmosphere 314

adiabatic gas law 314

adjustment factor 12, 21, 216

advice 270

air

density xvii

diffusion constant 253

molecule

cross-sectional area 220

mean free path 221

specific heat xvii, 267

thermal conductivity xvii, 267–270

thermal diffusivity 253

viscosity xvii, 253

air conditioning 268

air travel, regulated 121

airplane

see Boeing 747

Alaska 134

algebra, reducing 285

all-or-nothing reasoning 215, 225–228

ampere 172

amplitude

acoustic charge oscillation 335

complex 169

energy, relation to 323

input signal 45

peak-to-peak 51

piano string 323

sound wave 320

analogy

acoustics–electromagnetism 335

acoustics–electrostatics 337

as abstraction 36–53

bridges 37

by defocusing 46, 140

charge, electric–acoustic 331

circle–sphere 53

connected knowledge 357

cooling tea–discharging capacitor 49

density, areal–volume 86

electrical–gravitational 39, 170, 172, 341

electrical–magnetic 172

electrical–thermal 50, 135

energy, thermal–confinement 301

hydrogen–neutron star 232

mass–resistance 43

phonons–particles 256

phonons–photons 255

power radiated, acoustic–electromagnetic 337

quadrupole–dipole 340

radiated power, multipolar 341

solar core temperature–atmosphere height 305, 306

spring constant–Young’s modulus 189, 190

spring–capacitor 42

temperature–voltage 48

waves, sound–transverse 324

angles 155

dimensions of 288

in proportional reasoning 113

ångström 179

angular diameter 186

angular frequency 38, 45, 146, 324

angular momentum 177, 188, 313

angular resolution

eye 181

optical telescope 158

radio telescope 159

angular velocity

Earth’s orbit 345

falling toast 116

animal fat, combustion energy of 31

annuity 315

anxiety, when estimating 11

arcseconds 158

area 218

ellipse 283

areal density 86, 163

arithmetic mean 19, 36, 313

geometric mean, inequality with 36

arithmetic, mental

see mental arithmetic

armchair reasoning 204

Armstrong, Lance 22, 95

aspect ratio 240, 283

assumptions

checking 297

making 204, 297

refining 217

asteroids 228

astronomical unit (AU) xvii, 112

astrophysical scalings 232

atmosphere

adiabatic 314

isothermal 234, 314

lumped model 351

scale height 167, 299–301, 351

sea-level pressure xvii

standardized parameters 167

atmospheres (pressure) 191

atomic bomb, yield of 150–151, 211–212

atomic diameter 179, 221

atomic mass 273

atomic theory 175

atomic volume 189, 213

attenuation 47

Atwood machine 283–286

Atwood, George 284

AU (astronomical unit) xvii, 112

audibility 337

Avogadro’s number xvii, 29, 67, 166, 213, 222, 267, 307

baby boomers 215

baggage worth carrying 348

baking 260–261