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You could also send an email to the <a href="https://meta.wikimedia.org/wiki/Special:MyLanguage/Stewards" class="extiw" title="m:Special:MyLanguage/Stewards">stewards</a> <a href="https://meta.wikimedia.org/wiki/Special:MyLanguage/VRT" class="extiw" title="m:Special:MyLanguage/VRT">VRT</a> queue at <kbd>stewards@wikimedia.org</kbd> including all above details.</div></div><hr /> <p>Du kan se och kopiera denna sidas källtext. </p><textarea readonly="" accesskey="," id="wpTextbox1" cols="80" rows="25" style="" class="mw-editfont-monospace" lang="sv" dir="ltr" name="wpTextbox1">==Hastigheter== När man ser blixten brukar man räkna 1-2-3-4… ända tills dundret kommer fram. Då får man reda på hur långt man är från platsen där blixt och dunder uppstod, för ljuset går fram ohyggligt snabbt medan ljudet tar tre sekunder för varje kilometer. Om man alltså hinner räkna till sex betyder det att åskan var två kilometer bort. {| BORDER="3" CELLSPACING="5" |- ! ATT&nbsp;MINNAS&nbsp;(6) !''' Ljudets hastighet är ca 300 meter per sekund.''' |- |} Snabba passagerarflygplan brukar gå strax under ljudhastigheten, för vid ljudhastigheten blir det obehagliga vibrationer i flygplanskroppen. Militära plan gasar ibland på så att de snabbt tar sig förbi den hastigheten och sen kan köra lugnt vid mycket högre hastigheter. {| class="wikitable" |- | ÖVERSLAG&nbsp;25. || Solen går upp i öster, vandrar över himlen och går på kvällen ner i väster. Är det möjligt att med flygplan sätta efter solen, hinna upp den och i fullt solsken flyga jorden runt? |- |} Ja, det är möjligt att flyga ikapp solen, om man bara gör rundflygningen tillräckligt nära polen, så att den lillcirkel man följer när man flyger västerut runt jorden blir tillräckligt liten. Men om man då måste hålla sig mycket nära polen är det tveksamt om solen verkligen gick upp, och om den vandrade ”över himlen”, som det stod i frågan. Det kanske mera var så att den släpade sig längs horisonten. Låt oss räkna på 60 breddgraden, som de flesta av läsarna har erfarenhet av. Här går solen förvisso upp och ner, i synnerhet på sommaren. För att hålla jämn fart med solen måste planet flyga 2000 mil på ett solvarv, vilket är mindre än 100 mil per timme, 1000 km/h. Jämför det med ljudet som varje sekund går 300 meter. Det blir 60 · 60 · 300 meter per timme, vilket är lite mer än 1000 km/h. Kunde planet hålla ljudhastigheten, skulle det nätt och jämt vinna över solen, men med ett passagerarflygplan som går lite långsammare än ljudet är det bäst att anställa sin jakt på solen i väster lite längre upp i norr. Svar: Det är möjligt. (Många håller reda på att antalet meter per sekund gånger 3.6 = antal kilometer i timmen. Gör man det så går de sista stegen i uträkningen smidigare. 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