Question

Определить количество теплоты, прошедшее в течение 5 мин через слой зерна толщиной 2 м и площадью 1,5 м2, если разность температур верхней и нижней поверхностей 40С. Коэффициент теплопроводности зерна 0,174 Дж/(м.с.К).

Answer 1

Как известно, кол-во теплоты определяется по формуле К = m*g * (t1 - t2). Получаем ответ = 35 Дж.

Answer 2

Calculation of Heat Transfer

To calculate the amount of heat transferred through a layer of grain, we can use the formula:

Q = k * A * ΔT / d

Where: - Q is the amount of heat transferred - k is the thermal conductivity of the grain - A is the area of the layer of grain - ΔT is the temperature difference between the upper and lower surfaces of the layer - d is the thickness of the layer of grain

Given the following values: - k = 0.174 J/(m·s·K) (thermal conductivity of the grain) - A = 1.5 m² (area of the layer of grain) - ΔT = 40°C (temperature difference between the upper and lower surfaces of the layer) - d = 2 m (thickness of the layer of grain)

We can substitute these values into the formula to calculate the amount of heat transferred.

Q = (0.174 J/(m·s·K)) * (1.5 m²) * (40°C) / (2 m)

Calculating this expression gives us the amount of heat transferred through the layer of grain.

Please note that the units of temperature should be converted to Kelvin (K) before performing the calculation.

Let's calculate the result.