„Vatt“: Munur á milli breytinga

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NicoScribe (spjall | framlög)
Tek aftur breytingu 1568684 frá 82.112.90.101 (spjall) ?
Ekkert breytingarágrip
Merki: Farsímabreyting Breyting frá farsímavef
Lína 1:
Suicide is the act of intentionally causing one’s own death.[6] Risk factors include mental disorders such as depression, bipolar disorder, schizophrenia, personality disorders, and substance abuse, including alcoholism and use of benzodiazepines.[2][4][7] Other suicides are impulsive acts due to stress such as from financial difficulties, troubles with relationships, or from bullying.[2][8] Those who have previously attempted suicide are at higher risk for future attempts.[2] Suicide prevention efforts include limiting access to methods of suicide, such as firearms, drugs, and poisons, treating mental disorders and substance misuse, proper media reporting of suicide, and improving economic conditions.[2] Although crisis hotlines are common, there is little evidence for their effectiveness.[9] Suicide Edouard Manet - Le Suicidé.jpg The Suicide by Édouard Manet 1877–1881 Specialty Psychiatry Usual onset >70 and 15–30 years old[1] Causes Hanging, pesticide poisoning, firearms[2][3] Risk factors Depression, bipolar disorder, schizophrenia, personality disorders, alcoholism, substance misuse[4][2] Prevention Limiting access to methods of suicide, treating mental disorders and substance misuse, proper media reporting of suicide, improving economic conditions[2] Deaths 828,000 / 1.5% (2015)[5] [edit on Wikidata] The most commonly used method of suicide varies between countries, and is partly related to the availability of effective means.[10] Common methods include hanging, pesticide poisoning, and firearms.[2][3] Suicide resulted in 828,000 deaths globally in 2015 (up from 712,000 deaths in 1990).[5][11] This makes it the 10th leading cause of death worldwide.[4][12]
'''Vatt''' ([[enska]]: '''Watt''') er [[alþjóðlega einingakerfið|SI-mælieining]] fyrir [[afl]] eða afköst, táknuð með '''W'''. Eitt vatt jafngildir einingunni [[júl]] á [[sekúnda|sekúndu]]. Dregið af nafni skoska [[uppfinning]]amannsins [[James Watt]]. Einingin [[hestafl]] (ha), sem ekki er SI-mælieining, er oft notuð til að mæla afl [[bifreið|bílvéla]], en 1 ha = 746 W.
 
Skilgreiningin er að eitt vatt jafngildi einu júl á sekúndu sem jafngildir einum [[njútonmetri|njútonmetra]] á sekúndu:
:<math> 1 \ \mathrm{W} = 1 \ \dfrac{\mathrm{J}}{\mathrm{s}} = 1 \ \dfrac{\mathrm{kg} \cdot \mathrm{m^2}}{\mathrm{s^3}} = 1 \dfrac{\mathrm{N\cdot m}}{\mathrm{s}} .</math>
 
{{Alþjóðlega einingakerfið}}
 
[[Flokkur:SI mælieiningar]]