Constants

• Mass (kg=2.2 lb)
  • 6E24 kg Earth
  • 2E30 kg Sun
  • 200 tonnes Statue of Liberty
• Distances (1 km=.6 mi, 1.6 km=mi)
  • 4500 km from coast to coast
  • 40,000 km Earth circumference
  • 12,700 km Earth diameter
• kph speeds (3.6 kph = 1 m/s, 1 kph=.6 mph)
  • 5 kph walking
  • 20 kph running
  • 20 kph biking
  • 100 kph car on highway (60 mph)
  • 860 kph airplane
  • 40,000 kph escape velocity
• Altitude (1 m=3.28’)
  • 541 m (1776’) 1 World Trade Center
  • 9 km Mount Everest
  • 10 km airplane
  • 11 km Challenger Deep of the Mariana Trench
  • 400 km ISS
• Time
  • Life
    • 8 hour work day (9–5) for 5 days a week for 50 weeks a year = 2000 hours a year
    • 40 years of work if you retire at 65 and start working after college graduation (22) with 3 years taken off work
    • 80,000 hours of work in your life
    • 77 is average life expectancy