Estimation

Quantity Estimate
Mass of an apple 0.1 kg0.1 \unit{kg}
Mass of adult 70 kg70 \unit{kg}
Mass of car 1000 kg1000 \unit{kg}
Height of adult 2 m2 \unit{m}
Height of mountain 5000 m5000 \unit{m}
Walking speed 1 m s−11 \unit{m\,s^{-1}}
Speed of car on highway 30 m s−130 \unit{m\,s^{-1}}
Speed of plane 300 m s−1300 \unit{m\,s^{-1}}
Speed of sound in air 300 m s−1300 \unit{m\,s^{-1}}
Volume of a tin can 300 cm3300 \unit{cm^3}
Density of water 1000 kg m−31000 \unit{kg\,m^{-3}}
Energy requirement for a person for one day 10 000 000 J10\,000\,000 \unit{J}
Typical current in domestic appliance 13 A13 \unit{A}
e.m.f. of a car battery 12 V12 \unit{V}
Power of a car 60 000 000 W60\,000\,000 \unit{W}
Power of a person running 200 W200 \unit{W}