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Gun
.grande:maestro.

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241) Due fili conduttori lunghi 2m e distanti 1m sono soggetti ad una F=3,8milliN.
Che corrente circola nei due fili (approx le due correnti uguali)? A che distanza ci dobbiamo porre perchè i due fili interagiscano con F=10,5milliN se sono percorsi da 3,2A? La Forza è attrattiva o repulsiva?




[3,1A; 37cm; dipende da...]

11-06-2009 09:19
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242) Una bobina lunga 8cm e formata da 5000 spire. Nel suo centro c'è una spira circolare chiusa orientata come la spira, ha diametro=6,4cm e R=0,15ohm. La corrente nel solenoide varia uniformemente da 0 a 2 A in 0,003sec. Calcolare la i indota nella spira.


[0,113A]

11-06-2009 09:21
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243) un solenoide è formato da 20cm ed ha 10000 spire in più strati, tra le 2 sezioni molto vicine c'è in filo di 9cm percorso da 15A. A che F è sottoposto il filo se le solenoide circolano 5,3A?


[0,45N]

11-06-2009 09:23
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244) Si veda figura. Se i1=10A, i2=20A, trovare modulo, direzione e verso del campo B in P, Q, R.

11-06-2009 09:24
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245) Un fascio di elettroni viene accelerato da fermo grazie ad un V=500V in una regione dove c'è un B uniforme e perpendicolare agli elettroni che ruotano con r=10cm in moto circolare. B quanto vale?



[0,754milliT]

11-06-2009 09:25
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246) Una bobina quadrata di lato 10cm ha il solito lato mobile, la bobina è immersa in un B=0,5T perpendicolare, la Rbobina=5ohm e si suppone rimanga costante.
Muovendo il lato verdo destra nella bonina scorrono 0,5A. Quanto vale la v della bobina affinchè la i sia costante?



[2m/s]

11-06-2009 09:27
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R) R come Ripassone 2 parte :o)

Last edited by Gun on 11-06-2009 at 14:05

11-06-2009 09:28
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*continuo verso mezzogiorno*

se il thread supera le 10000 visite il compitino e lo scritto saranno più facili :D

11-06-2009 09:29
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247) Unità di misura di B e di E nel sistema MKSA in tutti i modi possibili

11-06-2009 11:11
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248) Seconda legge di Ohm in funzione di sezione e resistività: enunciarla, dire le unità di misura in MKSA

11-06-2009 11:12
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249) Se E=rho*J, che cos'è J? Che unità di misura ha?

11-06-2009 11:13
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250) La Terra ruota intorno al Sole (Tolomeo, d'you understand?) con un moto approx circolare uniforme.
Esprimere periodo, frequenza e pulsazione del moto di rivoluzione nelle corrette unità di misura.
Se distano 150 milioni di Km, quanto vale il modulo di accelerazione e velocità terrestri?
Che angolo spazia il vettore Sole-Terra in un giorno? Che arco viene percorso in un giorno?

Risolvere corredando con opportuni disegni e vettori

11-06-2009 11:16
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251) Verso 30g di latte a 4°C in 200g di the a 75°C. Di quanto si abbassa la T del the?




[9,26°C]

11-06-2009 11:17
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252) Una stanza ha dimensioni l=5m, L=4m, h=2,5m e l'aria è a T=20°C. Se la densità dell'aria è 1,3Kg/m^3, quanto vale la massa dell'aria nella stanza?
Se nella veranda l'aria è a 12°C e la veranda ha volume un terzo della stanza ed è collegata a queswta attraverso una porta... se apro la porta, sapendo che Cspecaria=10^3J/kgK, quanto sarà la T finale? Se Cspecaria cambia, che accade?


[65kg; 18°C; è un dato inutile, perchè?]

11-06-2009 11:21
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253) Un gas perfetto compie un'isoterma espansiva da A a B tale che in A p=32bar, V1l e in B p=1bar, V=32l. Trovare L nella trasformazione.




[L=11MJ]

11-06-2009 11:23
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