Question

Железный метеорит массой 0,05 кг вылетел в земную атмосферу из мирового пространства.При движении в атмосфере земли метеорит расплавился.Сколько выделилось теплоты при трении метеорита о воздух,если считать,что вся выделившаяся теплота пошла на нагревание и плавление метеорита?Начальную температуру метеорита принять равной -215С

Answer 1

Q=cm(t2-t1)+лm=m(c(t2-t1)+л)=

=0,05кг(460 Дж/кг*град*(1539-(-215))+2.7*10(5)Дж/кг=53500Дж=53.5кДж

Answer 2

Calculation of Heat Generated by Friction

To calculate the heat generated by the friction of the meteorite with the air during its movement through the Earth's atmosphere, we need to use the specific heat capacity of the meteorite material. Unfortunately, the specific heat capacity of iron meteorites is not readily available in the search results. However, we can make an estimation using the specific heat capacity of pure iron.

The specific heat capacity of pure iron is approximately 0.45 J/g°C Since the mass of the meteorite is given as 0.05 kg, we can convert it to grams by multiplying by 1000, resulting in a mass of 50 grams.

Given that the initial temperature of the meteorite is -215°C, we need to convert it to Kelvin by adding 273.15 to the Celsius temperature. Therefore, the initial temperature of the meteorite is 58.15 K.

To find the heat generated, we can use the formula:

Q = m * c * ΔT

Where: - Q is the heat generated (in joules) - m is the mass of the meteorite (in grams) - c is the specific heat capacity of the meteorite material (in J/g°C) - ΔT is the change in temperature (in °C)

Substituting the values into the formula, we get:

Q = 50 g * 0.45 J/g°C * (0°C - (-215°C))

Simplifying the equation:

Q = 50 g * 0.45 J/g°C * 215°C

Calculating the result:

Q ≈ 4837.5 J

Therefore, approximately 4837.5 joules of heat were generated by the friction of the meteorite with the air during its movement through the Earth's atmosphere.

Please note that this calculation is an estimation based on the specific heat capacity of pure iron, as the specific heat capacity of iron meteorites is not readily available in the search results.

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