Question

Для нагревания бетонной плиты массой 200кг о температуры 10 градусов до 40 градусов потребовалось 5,3МДж теплоты.Найдите удельную теплоемкость бетона

Answer 1

Количество теплоты это Q=c*m*(t2-t1)
отсюда 5,3*10^6=c*200*(40-10)
5300000=6000*c
c=5300000/6000=883.3 Дж/(кг*К)=0,883 кДж/(кг*К)

Answer 2

Calculation of Specific Heat Capacity of Concrete

To find the specific heat capacity of concrete, we can use the formula:

Q = mcΔT

Where: - Q is the amount of heat energy transferred (in joules) - m is the mass of the concrete (in kilograms) - c is the specific heat capacity of the concrete (in joules per kilogram per degree Celsius) - ΔT is the change in temperature (in degrees Celsius)

In this case, we have the following values: - Q = 5.3 MJ (5.3 × 10^6 J) - m = 200 kg - ΔT = 40°C - 10°C = 30°C

Substituting these values into the formula, we can solve for c:

5.3 × 10^6 J = 200 kg × c × 30°C

Simplifying the equation:

c = (5.3 × 10^6 J) / (200 kg × 30°C)

Calculating the value:

c = 8,833.33 J/(kg·°C)

Therefore, the specific heat capacity of the concrete is approximately 8,833.33 J/(kg·°C).

Please note that the specific heat capacity of concrete can vary depending on its composition and other factors. The value provided here is an approximation based on the given information.