Вопрос школьника по предмету Физика
Почему же при замыкании цепи фонари на улице, соединенные проводом длиной 50 м, загораются почти одновременно?
Ответ учителя по предмету Физика
поскольку ток по проводу распространяется почти со скоростью света, то 50 метров он проходит за 50/300000000 сек, то есть за 1,6*10
^-7 сек
Похожие вопросы от пользователей
the national trust for places of historic interest or natural beauty usually known as the national trust , is a conservation organization in England , Wales and Northern Ireland . The Trust doesn’t operate in Scotland ,where there is an independent National Trust for Scotland . The Trust was founded by three English people .Its symbol is a sprig of oak leaves acorns. The National Trust works to preserve and protect the coastline, countryside and buildings os England , Wales and Northern Ireland. It is done in various ways , through practical caring and conservation , through educating and informing and through encouraging millions of people tomenjoy their national heritage. The Trust owns many heritage properties including historic houses and gardens , industrial monuments and social history places most of which are open to the public free of charge. The majority of them are country houses and mostof the others are connected with famous individuals . A lot of these houses contain collections of pictures , furniture , books , metalwork , ceramics and textiles that have remained in their historic context. Thus the National Thus is one of the largest landowners in the UK . The Trust’s land is about 1,5 % of the total land mass of England , Wales and Northern Ireland . There are also many countryside properties which were acquired specifically for their landscape and scientific value. The Trust owns about a quarter of the Lake District. It also owns or protects nearly one fifth of the coast in England , Wales and Northern Ireland. The National Trust is one of the largest membership organizations in the world. Membership numbers have grown from two million at the end of the previous century up to nearly four million in 2013 get in. All photography at the National Trust properties is not allowed. The formal purpose of the Trust is to preserve for the benefit of the nation its lands , places of beauty and / or historic interest which leads to preservation of the natural aspect , features , animal and plant life , preservation of buildings , furniture , pictures etc having national and historic or artistic interest.
Запишите многочлен в виде суммы одночленов:
5a²-3a+1