Question

Какова масса железной детали ,если на её нагревание от 20 до 200 градусов цельсия пошло 20,7 кДж теплоты?(удельная теплоемкость железа 460 дж / кг(с))

Answer 1

Формула:
m=Q/(c*(t2-t1))
Решение:
m = 20700дж / (460 дж/кгС * (200С-20С))= 0,25 кг

Answer 2

Calculation of the Mass of the Iron Piece

To calculate the mass of the iron piece, we can use the formula:

Q = mcΔT

Where: - Q is the heat energy absorbed or released by the object (in joules) - m is the mass of the object (in kilograms) - c is the specific heat capacity of the material (in joules per kilogram per degree Celsius) - ΔT is the change in temperature (in degrees Celsius)

In this case, we are given: - Q = 20.7 kJ (20,700 J) - ΔT = 200°C - 20°C = 180°C - c = 460 J/kg°C

Substituting these values into the formula, we can solve for the mass (m):

20,700 J = m * 460 J/kg°C * 180°C

To find the mass, we divide both sides of the equation by (460 J/kg°C * 180°C):

m = 20,700 J / (460 J/kg°C * 180°C)

Now, let's calculate the mass using the given values:

m = 20,700 J / (460 J/kg°C * 180°C)

m ≈ 0.25 kg

Therefore, the mass of the iron piece is approximately 0.25 kg.