Предмет: Физика, автор: mishchenko07

ПОМОГИТЕ РЕШИТЬ ЗАДАЧУ: С помощью динамометра равномерно тянут брусок
по столу с силой 7H. Найти массу бруска,если коэффициент трения скольжения между брусом и столом равно 0,25.

Ответы

Автор ответа: drama46

Ответ:

2,8 кг.

Объяснение:

Поскольку брусок скользит по поверхности стола равномерно, согласно второму закону Ньютона, F - Fтр = 0, откуда F = Fтр = ω*g*m, где ω = 0,25 (коэффициент трения), g = 9,8 Н/кг (ускорение свободного падения на поверхности Земли).

Тогда m = F/(ω*g) = 7/(0,25*9,8) ≈ 2,8 кг.

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