Fermi Questions Memorization (copy) Suhaas Vemuri

Radius of Earth (m)

6.5e6

Volume of Earth (m³)

1e21

Surface Area of Earth (m²)

5e14

Radius of Sun (m)

7e8

Volume of Sun (m³)

1.4e27

Mass of Earth (kg)

6e24

Mass of Sun (kg)

2e30

Distance from Moon to Earth

240K mi, 3.84e8 m

Distance from Sun to Earth

93M mi, 1.5e11 m

Distance from Earth to Jupiter

500M mi

Distance from Earth to Venus

50M mi

Average Depth of Ocean

4 km

Deepest Point in the Ocean

11 km

Average Height of Earth’s Crust

1 km

Highest Point on Earth

10 km

Gravitational Constant

6.67e-11

Amount of Land on Earth

1e14 m²

Amount of Ocean on Earth

1.335e18 m³

Jupiter Diameter

10*Earth

Jupiter Volume

1000*Earth

Sun Diameter

10*Jupiter, 100*Earth

Amount of Google Searches per Day

1e10

Amount of Google Users

4.3e9

Small Coin - mass, diameter, width

2 g, 2 cm, 1.5 mm

Big Coin - mass, diameter, width

5 g, 2 cm, 2mm

Total Birds in the US

10B

Total Bird Species in the US

800

Total Birds in the World

50B

Total Bird Species in the World

11K

Birds/Person

5

Total Fish in the US

150M

Fish Species in North America

800

Total Fish in the World

3.5T

Total Fish Species in the World

10K

Total Mammal Species in the US

400

Total Mammal Species in the World

5400

Number of Sci Oly Teams

6000

Students per Team in Sci Oly

15

Number of Events in Sci Oly

23

Primes below 100

25

Primes below 1000

150

Primes below 10K

1000

Primes below 100K

10K

Primes below 1M

75K

Primes below 10M

500K

Primes below 100M

5M

Primes below 1B

50M

Formula for calculating primes

0.434x/log(x)

US GDP

23T

US Debt

35T

Average Income

40K

China GDP

14T

India GDP

3.2T

World GDP

100T

Speed of Light

3e8 m/s

Wavelength of Visible Light

400-700 nm

Speed of Sound

343 m/s

Mass of a Proton

1.6e-27 kg

Radius of a Proton

1e-15 m

Mass of an Electron

1e-30 kg

Radius of an Electron

2e-15 m

Mass of H atom

1.7e-27

Radius of H atom

5.3e-11

Average Molar Mass of Air

30 g/mol

Average Molar Mass of Human

55 g/mol

Distance to Alpha Centauri

4.37e16 m

Radius of Solar System

4.5e12 m

Radius of Milky Way

5e20 m

Distance to Sirius

1e17 m

Distance to Proxima Centauri

4e16 m

Distance to Barnard’s Star

6e16 m

Roulette

1/37 per number, ½ per color

Factorial Formula

e^(nlogn - 0.434n)

Number of Digits in Exponent a^b

blog(a)

log(2)

0.301

log(3)

0.477

log(4)

0.602

log(5)

0.698

log(6)

0.778

log(7)

0.845

log(8)

0.903

log(9)

0.954

log(e)

0.434

Fibonacci Sequence

0.209n-0.35

Tweets/day

500M

Instagram Users

2B

Twitter Users

330M

Facebook Users

2.9B

Facebook Likes/min

4M

LinkedIn Users

800M

LinkedIn Users (US)

180M

TikTok Users

1B

TikTok Users (US)

100M

Snapchat Users

600M

Baseball Diamond - Each Side

90 ft

Baseball Diamond - Center Field

400 fr

Stadium Capacity

50K

Football Field

90m*50m

Soccer Field

100m*60m

Olympic Swimming Pool

50×25×2 m