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(1) A party trick involves pulling a tablecloth quickly to keep plates on a table. For a plate on a 1m diameter table, the cloth must move at 5 m/s. For a motorbike on a 7m table with plates 0.5m apart, the bike must move at 20 m/s. For a toy car to stay, the cloth must move faster than 10 m/s. (2) Solar sails use light pressure for propulsion and can reach high speeds without fuel. The maximum area density is 1 kg/m^2 to avoid falling into the sun. From 1 AU, a perfectly absorbing sail reaches a final sp

Author

Boldie Lutwig

Language

EN