пудьласка допожіть я подпишуся і поставлю самий лужний атвет !Задача. За до динамометра рівномірно тягнуть книжку по столу, прикладаючи силу 2,5 Н. Знайдіть масу книжки, якщо коефіцієнт тертя ковзання між книжкою та столом дорівнює 0,2.
Moscow is the capital of the Russian Federation and the administrative center of the Moscow region, it is also the largest Russian city with over 12 million residents. Moscow is located on the Moskva River in the European part of the country. Most historians agree that this river gave its name to the city. The Moscow Metro is considered to be one of the most beautiful underground systems in the world. Indeed, many of the stations have beautiful murals on the walls.There are many theaters, monuments, parks, squares and theaters in Moscow. For example, there are more than 150 theaters that produce shows of various genres (the Taganka Theater, Lenkom Theatre, Sovremennik Theater). Moscow offers an exciting nightlife. A lot of the clubs open their doors for people who want to relax and dance all night.
2.По закону сохранения энергии количество тепла при сжигании спирта используется для нагрева воды Количество тепла для воды=мв*с*(Т2-Т1) где мв=2кг, с=4200 - удельная теплоемкость воды, Т2-Т1=15; Количество тепла от сгорания=мс*удельн.тепл.сгорания где мс-масса спирта, удельн.тепл.сгорания= 29*(10**6) Дж/кг - удельная теплота сгорания спирта
Количество тепла для воды=Количество тепла для воды
мс=мв*с*(Т2-Т1)/удельн.тепл.сгорания=2*4200*15/(29*(10**6))=0,00405 или 4г спирт 3.буквы уже непомнюкг угля выделит 13000кДж следовательно 0,5 кг выделят 6500 кДжводе на 1 градус нагревания надо 100кг* 4200Дж/кгравно 420000 Дж на градустеперь 6500000Дж делим на 420000 Дж и получаем ответ 15,4 градуса(я не на сто процентов уверен что это правильно) 4.Q=q*m=q*p*V= 700(кг/м3)*5*10(в минус 3 степени)(м3)*46*10(в 6 степени)=16,1*10(в 7 степени)Дж
Moscow is the capital of the Russian Federation and the administrative center of the Moscow region, it is also the largest Russian city with over 12 million residents. Moscow is located on the Moskva River in the European part of the country. Most historians agree that this river gave its name to the city. The Moscow Metro is considered to be one of the most beautiful underground systems in the world. Indeed, many of the stations have beautiful murals on the walls.There are many theaters, monuments, parks, squares and theaters in Moscow. For example, there are more than 150 theaters that produce shows of various genres (the Taganka Theater, Lenkom Theatre, Sovremennik Theater). Moscow offers an exciting nightlife. A lot of the clubs open their doors for people who want to relax and dance all night.
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