Question

Расчитайте количество теплоты, необходимое для нагревания а)алюминиевой ложки массой 50 г от 20 до 90°с б) кирпичного камина массой 2 т от 10 до 40°с.удельная теплоемкость алюминия – 920 дж/кг*°Судельная теплоемкость кирпича – 880 дж/кг*°Спжшки очень срочно​

Answer 1

Ответ:

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Объяснение:

вот так..............

Answer 2

Calculation of Heat Required

To calculate the amount of heat required to heat up an object, we can use the formula:

Q = m * c * ΔT

Where: - Q is the heat energy (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)

Let's calculate the heat required for each scenario:

a) Heating an aluminum spoon from 20°C to 90°C: - Mass of the aluminum spoon (m) = 50 g = 0.05 kg - Specific heat capacity of aluminum (c) = 920 J/kg°C - Change in temperature (ΔT) = 90°C - 20°C = 70°C

Using the formula, we can calculate the heat required (Q):

Q = 0.05 kg * 920 J/kg°C * 70°C = 3220 J

Therefore, the heat required to heat the aluminum spoon from 20°C to 90°C is 3220 joules.

b) Heating a brick fireplace from 10°C to 40°C: - Mass of the brick fireplace (m) = 2 tons = 2000 kg - Specific heat capacity of brick (c) = 880 J/kg°C - Change in temperature (ΔT) = 40°C - 10°C = 30°C

Using the formula, we can calculate the heat required (Q):

Q = 2000 kg * 880 J/kg°C * 30°C = 52,800,000 J

Therefore, the heat required to heat the brick fireplace from 10°C to 40°C is 52,800,000 joules.

Please note that the calculations assume no heat loss to the surroundings and that the specific heat capacity values provided are accurate.