SI Units, Constants, and prefixes

Question 1

distance

Answer 1

d = meters = m

Question 2

mass

Answer 2

m = kilograms = kg

Question 3

time

Answer 3

t = seconds = s

Question 4

velocity/speed

Answer 4

v = meters/second = m/s

Question 5

acceleration

Answer 5

a = meters/second squared = m/s^2

Question 6

force

Answer 6

F = newtons = N

Question 7

torque

Answer 7

τ = newton-meters = N•m

Vector!

Question 8

momentum

Answer 8

ρ = kg•m/s

Question 9

impulse

Answer 9

J = newton-seconds = N•s

Question 10

work

Answer 10

W = joules = J = kg•m^2/s^2

Question 11

energy

Answer 11

KE/PE/E = joules = J = kg•m^2/s^2

Question 12

power

Answer 12

P = watts = W = J/s

Question 13

pressure

Answer 13

P = pascals = Pa = N/m^2

Question 14

density

Answer 14

ρ = kilograms per cubic meter = kg/m^3

Question 15

flow rate

Answer 15

f = m^3/s

Question 16

electric charge

Answer 16

q = coulombs = C

Question 17

electric field

Answer 17

E = Newtons per coulomb = N/C (or volts per meter = V/m)

Question 18

electric potential

Answer 18

φ = volts = V = J/C

Question 19

voltage

Answer 19

V = volts = J/C

Question 20

current

Answer 20

I = amps = A = C/s

Question 21

resistance

Answer 21

R = ohms = Ω = V/A

Question 22

resistivity

Answer 22

ρ = ohm-meters = Ω•m

Question 23

capacitance

Answer 23

C = farads = F = C/V

Question 24

magnetic field

Answer 24

B = tesla = T = N/A•m

Question 25

frequency

Answer 25

f = hertz = Hz = s^-1

Question 26

period

Answer 26

T = seconds = s

Question 27

sound level

Answer 27

β = decibals = dB

Question 28

lens power

Answer 28

P = diopters = D = m^-1

Question 29

gravity

Answer 29

10 m/s^2

Question 30

density of water

Answer 30

ρ = 1000kg/m^3 = 1g/cm^3

Question 31

elementary electric charge

Answer 31

e = 1.6x10^-19 C

Question 32

Coulomb’s constant

Answer 32

k = 9x10^9 N•m^2/C^2

Question 33

threshold of human hearing

Answer 33

I = 10^-12 W/m^2

Question 34

speed of light in a vacuum

Answer 34

v = 3x10^8 m/s

Question 35

pico

Answer 35

p = 10^-12

Question 36

nano

Answer 36

n = 10^-9

Question 37

micro

Answer 37

μ = 10^-6

Question 38

milli

Answer 38

m = 10^-3

Question 39

centi

Answer 39

c = 10^-2

Question 40

kilo

Answer 40

k = 10^3

Question 41

mega

Answer 41

M = 10^6

Question 42

giga

Answer 42

G = 10^9

Question 43

speed of sound

Answer 43

340 m/s (in air)