Final answer:
To raise the temperature of 2kg of iron by 5 degrees, 920 J of energy must be transferred into it.
Step-by-step explanation:
To calculate the amount of energy transferred into the iron, we can use the formula: Q = mcΔT, where Q is the energy transferred, m is the mass of the iron, c is the specific heat capacity of iron, and ΔT is the change in temperature. In this case, the mass of the iron is 2 kg, the specific heat capacity of iron is 0.449 J/g °C (or 449 J/kg °C), and the change in temperature is 5 °C. Plugging in these values, we get: Q = (2 kg) * (449 J/kg °C) * (5 °C) = 4490 J.
Therefore, the correct answer is B) 920 J.