Question

Какое количество тепла требуется для того, чтобы стальную деталь массой 200 кг нагреть на 50К? Удельная теплоёмкость стали 460 Дж(кгК). Ответ дать в килоджоулях.

Answer 1

Q= cm T

Q= 460*200*50=4600000 дж

Answer 2

Calculation of Heat Required to Heat a Steel Component

To calculate the amount of heat required to heat a steel component, we can use the formula:

Q = m * c * ΔT

Where: - Q is the amount of heat required (in joules) - m is the mass of the steel component (in kilograms) - c is the specific heat capacity of steel (in joules per kilogram per Kelvin) - ΔT is the change in temperature (in Kelvin)

In this case, we have the following values: - Mass of the steel component (m) = 200 kg - Specific heat capacity of steel (c) = 460 J/(kg·K) - Change in temperature (ΔT) = 50 K

Let's substitute these values into the formula to calculate the amount of heat required.

Q = 200 kg * 460 J/(kg·K) * 50 K

Calculating this expression gives us the amount of heat required in joules. However, the question asks for the answer in kilojoules. To convert joules to kilojoules, we divide the result by 1000.

Q = (200 kg * 460 J/(kg·K) * 50 K) / 1000

Now let's calculate the result.

Q = 200 kg * 460 J/(kg·K) * 50 K / 1000

Using a calculator, we find that the amount of heat required to heat the steel component is 460,000 joules, which is equal to 460 kilojoules.

Therefore, the amount of heat required to heat a steel component with a mass of 200 kg by 50 K is 460 kilojoules.