Ответы
Ответ:
To answer this question, we need to use the specific heat capacity of iron and the formula for calculating the energy needed to heat an object.
The specific heat capacity of iron is 0.45 J/g°C, which means it takes 0.45 joules of energy to raise the temperature of 1 gram of iron by 1°C.
The amount of energy needed to raise the temperature of an object is calculated using the formula:
Q = m * c * ΔT
Where:
* Q is the amount of heat (in Joules)
* m is the mass of the object (in grams)
* c is the specific heat capacity ( J/g°C for iron)
* ΔT is the change in temperature (in degrees Celsius)
Plugging in the values for our problem, we get:
Q = 3000 * 0.45 * 20 = 27000 Joules
So, to raise 3 kilograms of iron by 20°C, you would need approximately 27000 Joules of energy.