Thursday, 31 March 2011

Superconductivity from nowhere

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"In just over a week scientists will celebrate the centenary of superconductivity: the discovery, in 1911, that some materials coole...

Candy floss of rocks

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"The earliest rocks in the solar system, from which the terrestrial planets were born, were more like candy floss than hard rock, acco...

Physicists put a new twist on graphene

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"Physicists in the US and UK have worked out why different samples of multilayer graphene can have very different electronic properties...
Wednesday, 30 March 2011

Poisson distribution

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The Poisson distribution (or Poisson law of small numbers ) is a discrete probability distribution that expresses the probability of a num...
Tuesday, 29 March 2011

Prodotto esterno di r e v

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Domanda interessantissima di uno studente: “Abbiamo visto studiando il moto circolare che  w x r = v  (per chi ha Firefox: la omega risulta...
Sunday, 27 March 2011

Balance scale

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"The balance scale is such a simple device that its usage likely far predates the evidence. What has allowed archaeologists to link art...
Saturday, 26 March 2011

Oscillazione smorzata

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Consideriamo una oscillazione smorzata. Vediamo come varia la funzione al variare del coefficiente di smorzamento, confrontandola con la pur...

Moti relativi

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Derivazione di un vettore unitario e relazioni di velocita‘ e accelerazione tra riferimento fisso e ruotante. Abbiamo visto discutendo la d...
Friday, 25 March 2011

Undergraduates build power system for moon orbiter

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Final-year engineering undergraduates from Warwick University are building the power system for a micro-satellite that will orbit the moon i...
Wednesday, 23 March 2011

Accelerazione tangenziale e centripeta

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Un oggetto si muove lungo una traiettoria curva con velocità che cambia sia in modulo che in  direzione. Ricordiamo che la velocita' ha ...