Question

Стальной резец массой 400 г раскален до желтого цвета. Какой температуре соответствует такой цвет, если резец, опущенный в воду для закалки, нагрел 800 г воды на 42 градуса?

Answer 1

1)2 * 460 (1050-50)=920кДж

Answer 2

Temperature of the Yellow-Hot Steel Blade

To determine the temperature at which the steel blade turns yellow-hot, we need to consider the color temperature chart for heated metals. The color of a heated metal can provide an approximate indication of its temperature. However, it is important to note that the color alone is not a precise measurement of temperature.

Based on the information provided, the steel blade is heated until it reaches a yellow color. To find the corresponding temperature, we can refer to the color temperature chart for heated metals. Unfortunately, the search results provided do not contain specific information about the temperature corresponding to a yellow color for steel.

However, it is worth noting that the color of heated steel can vary depending on factors such as the composition of the steel, impurities, and the lighting conditions. Therefore, it is difficult to determine the exact temperature based solely on the color.

If you require a more precise temperature measurement, it is recommended to use a pyrometer or an infrared thermometer to directly measure the temperature of the steel blade.

Heating Water with the Hot Steel Blade

According to the information provided, the hot steel blade, weighing 400 grams, is used to heat 800 grams of water by 42 degrees Celsius. To calculate the initial temperature of the water, we can use the formula:

Q = mcΔT

Where: - Q is the heat transferred - m is the mass of the water - c is the specific heat capacity of water - ΔT is the change in temperature

Given that the mass of the water (m) is 800 grams and the change in temperature (ΔT) is 42 degrees Celsius, we can rearrange the formula to solve for the initial temperature (T1) of the water:

T1 = (Q / (mc)) + T2

Where: - T1 is the initial temperature of the water - Q is the heat transferred (calculated using the mass and specific heat capacity of the steel blade) - m is the mass of the water - c is the specific heat capacity of water - T2 is the final temperature of the water after heating

To calculate the heat transferred (Q), we can use the formula:

Q = mcΔT

Where: - m is the mass of the steel blade - c is the specific heat capacity of steel - ΔT is the change in temperature (from the initial temperature of the steel blade to the final temperature when it is dropped into the water)

Unfortunately, the specific heat capacity of the steel blade and the specific heat capacity of water are not provided in the information given. Therefore, we cannot calculate the exact initial temperature of the water without this information.

If you have the specific heat capacity of the steel blade and the specific heat capacity of water, please provide them so that we can calculate the initial temperature of the water accurately.