Question

Помогите,пожалуйста!) Свинцовая пуля, летевшая со скоростью 500 м/с, пробила стенку. Определите на сколько градусов нагрелась пуля, если после вылета из стенки ее скорость снизилась до 400 м/с. Считайте, что на нагревание пули пошло 50% механической энергии.

Answer 1

Вот ответ. Берешь эту формулу, из нее выводится следующая, и подставляешь значения.

Answer 2

Calculation of the Temperature Increase of a Bullet

To determine the temperature increase of a bullet after it penetrates a wall, we can use the principle of conservation of mechanical energy. We know that the bullet's initial velocity is 500 m/s and its final velocity after penetrating the wall is 400 m/s. Additionally, we are given that 50% of the bullet's mechanical energy is converted into heat.

The formula for kinetic energy is:

KE = (1/2) * m * v^2

where KE is the kinetic energy, m is the mass of the bullet, and v is the velocity of the bullet.

Since the mass of the bullet is not provided, we can assume it to be constant throughout the calculation.

Let's denote the initial kinetic energy of the bullet as KE_initial and the final kinetic energy after penetrating the wall as KE_final.

The initial kinetic energy of the bullet is:

KE_initial = (1/2) * m * (500 m/s)^2

The final kinetic energy of the bullet is:

KE_final = (1/2) * m * (400 m/s)^2

The difference between the initial and final kinetic energies represents the mechanical energy converted into heat:

Heat = KE_initial - KE_final

Since we are given that 50% of the bullet's mechanical energy is converted into heat, we can calculate the temperature increase using the specific heat capacity of lead, which is approximately 0.13 J/g°C.

To calculate the temperature increase, we need to know the mass of the bullet. Unfortunately, the mass is not provided in the question. Therefore, we cannot provide an exact numerical answer without this information.

However, we can still discuss the general process and factors that affect the temperature increase. The temperature increase depends on the mass of the bullet, the specific heat capacity of the material, and the amount of mechanical energy converted into heat.

Please provide the mass of the bullet so that we can calculate the temperature increase more accurately.