Question

ПРОШУ МНЕ ДО ЗАВТРА НУЖНО СДАВАТЬ РАБОТУ !!! У чавунні сковорідці масою 800 г міститься 400 г соняшникової олії. Яка була її початкова температура, якщо для нагрівання сковорідки і олії до 100 оС знадобилося 92 кДж теплоти? Питома теплоємність соняшникової олії дорівнює 1800 Дж/(кг·оС). СДЕЛАЙТЕ ПОЖАЛУЙСТА С ДАНО И РЕШЕНИЕМ!!! ПРОШУ ДАЮ 100БАЛЛОВ

Answer 1

To find the initial temperature of the sunflower oil in the cast iron skillet, we can use the equation for heat transfer:

Q = mcΔT

Where: - Q is the heat transferred (92 kJ) - m is the mass of the sunflower oil (400 g or 0.4 kg) - c is the specific heat capacity of the sunflower oil (1800 J/(kg·°C)) - ΔT is the change in temperature (final temperature - initial temperature)

We need to solve for the initial temperature, so let's rearrange the equation:

ΔT = Q / (mc)

Now we can substitute the given values into the equation:

ΔT = 92 kJ / (0.4 kg * 1800 J/(kg·°C))

Converting kJ to J:

ΔT = 92,000 J / (0.4 kg * 1800 J/(kg·°C))

Simplifying:

ΔT = 92,000 J / (720 J/°C)

ΔT = 127.78 °C

To find the initial temperature, we subtract the change in temperature from the final temperature:

Initial temperature = Final temperature - ΔT

Given that the final temperature is 100 °C, we can calculate the initial temperature:

Initial temperature = 100 °C - 127.78 °C

Initial temperature = -27.78 °C

Therefore, the initial temperature of the sunflower oil in the cast iron skillet was approximately -27.78 °C.

Please note that negative temperatures are not physically meaningful in this context. It is possible that there was an error in the calculations or the given values.

Answer 2

To find the initial temperature of the sunflower oil in the cast iron skillet, we can use the formula for heat transfer:

Q = mcΔT

Where: Q is the heat transferred (92 kJ) m is the mass of the oil (400 g) c is the specific heat capacity of the oil (1800 J/(kg·°C)) ΔT is the change in temperature

We can rearrange the formula to solve for ΔT:

ΔT = Q / (mc)

Substituting the given values:

ΔT = (92 kJ) / (400 g * 1800 J/(kg·°C))

Converting the mass to kilograms:

ΔT = (92 kJ) / (0.4 kg * 1800 J/(kg·°C))

Calculating the value:

ΔT = 92,000 J / (0.4 kg * 1800 J/(kg·°C)) ΔT = 92,000 J / 720 J/°C ΔT ≈ 127.78 °C

To find the initial temperature, we subtract the change in temperature from the final temperature:

Initial temperature = Final temperature - ΔT Initial temperature = 100 °C - 127.78 °C Initial temperature ≈ -27.78 °C

Therefore, the initial temperature of the sunflower oil in the cast iron skillet was approximately -27.78 °C.

Please note