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Er litt usikker på om jeg i det hele tatt skjønner problemstillingen.

Jeg har tenkt:
Ep_fjær = Ep_kule + Ek_kule

Utifra dette har jeg regnet ut farten i det kula forlater røret:
v= √kx^2 - 2mgx/m  m/s = 10,8 m/s

Bruker farten til å finne Ek_kule:
Ek_kule = 1/2mv^2 = 0,5 * 0,0064 * 10,8^2 J = 0,38 J

Siden Ep_fjær=Ep_kule+Ek_kule, tenker jeg at jeg får likningen som sier at:
0,38 J = mgh + 0,37 J
h = 0,01 J/mg = 15,33 m

Fasiten sier 6,0 m. Noe som tyder på at jeg er helt ute å kjører.

Hva er grunnen til at jod er i fast form, mens klor er i gassform ved romtemp.?

hei,

dette systemet  fungerer ikke som buffer. les hva planke har skrevet i linken her:

http://realisten.com/smf/index.php?topic=3583.0

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jeg skrev reaksjonen slik:  HSO4- + H3O+ <--> H2SO4 + H2O

så skal jeg forklare det som skjer når systemet fungerer som buffer:

er at når vi tilsetter base så vil reaksjonen gå mot venstre, fordi tilsetting av OH- vil redusere H3O+ og likevekten forskyves mot venstre for å holde H3O+ oppe .. ikke sant?
og reaksjonen blir: H2SO4 + OH- --> HSO4- + H2O

men hva skjer hvis vi tilsetter syre??? reaksjonen vil gå mot høyre ikke sant?
KAN NOEN FORKLARE DET PÅ SAMME MÅTE SOM JEG SA OM TILSETTING AV BASE??

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Du har med en null for mye og det mangler enhet i uttrykket. Det skal stå: Ep = 0,5*300*0,05^2 J = 0,38 J
Spørsmålet videre er er: Hvor høyt opp må kula for at kulas potensielle energi skal bli økt med 0,38 J

Kunne trengt litt hjelp med en oppgave.

En fjær med stivhet 300 N/m blir presset sammen 5,0 cm og låst inn i et loddrett rør. Hvor stor potensiell energi har fjæren nå? Oppå fjæren ligger det en klinkekule med masse 6,4 kg. Fjæren blir løst ut, og kula blir skutt loddrett oppover. Hvor høyt kommer kula? Vi tenker oss at fjæren er masseløs.

Har funnet den potensielle energien til fjæra
Ep = 0,5*300*0,005^2 = 0,38 J

Hvordan skal jeg så gå fram for å finne høyden til kula?

Takk på forhånd!