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Constant energy ellipsoids in silicon near the six conduction band minima. For each valley (band minimum), the effective masses are mℓ = 0.92me ("long
Constant energy ellipsoids in silicon near the six conduction band minima. For each valley (band minimum), the effective masses are mℓ = 0.92me ("longitudinal"; along one axis) and mt = 0.19me ("transverse"; along two axes).
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A 2 kg (4.4 lb) cast iron weight used for balances
A 2 kg (4.4 lb) cast iron weight used for balances
Depiction of early balance scales in the Papyrus of Hunefer (dated to the 19th dynasty, c. 1285 BCE). The scene shows Anubis weighing the heart of Hun
Depiction of early balance scales in the Papyrus of Hunefer (dated to the 19th dynasty, c. 1285 BCE). The scene shows Anubis weighing the heart of Hunefer.
Galileo Galilei (1636)
Galileo Galilei (1636)
Distance traveled by a freely falling ball is proportional to the square of the elapsed time.
Distance traveled by a freely falling ball is proportional to the square of the elapsed time.