Question

Какая масса пороха должна быть сожжена,чтобы получить энергию,необходимую для полета пули массой 10 г со скоростью 900 м\с (каллорийность пороха=3 МДж\кг)

Answer 1

K-калорийность пороха 3МДж/кг = 3*10^6 Дж/кг
Энергия пороха переходит в кинетическую энергию пули.
Eк=Eп
Eп=k*M (M-масса пороха)
Ек=mV^2/2 (m - масса пули)
k*M = mV^2/2

M=mV^2/2k = ....

Answer 2

Calculating the Energy Required for Bullet Flight

To calculate the energy required for the flight of a bullet, we can use the formula for kinetic energy:

Kinetic Energy (KE) = 0.5 * mass * velocity^2

Given: - Mass of the bullet (m) = 10 g = 0.01 kg - Velocity of the bullet (v) = 900 m/s

Using the given values, we can calculate the kinetic energy of the bullet.

Calculating Kinetic Energy

The kinetic energy (KE) of the bullet can be calculated using the formula:

KE = 0.5 * m * v^2

Substituting the given values: KE = 0.5 * 0.01 kg * (900 m/s)^2

This calculation will give us the kinetic energy required for the flight of the bullet.

Using the Calorific Value of Gunpowder

The calorific value of the gunpowder is given as 3 MJ/kg (megajoules per kilogram).

To find the mass of gunpowder required to produce the energy for the bullet's flight, we can use the formula:

Energy = Mass of gunpowder * Calorific value

We already have the energy required for the bullet's flight (calculated kinetic energy). By rearranging the formula, we can solve for the mass of gunpowder required.

Calculating the Mass of Gunpowder

The mass of gunpowder required can be calculated using the formula:

Mass of gunpowder = Energy / Calorific value

Substituting the calculated kinetic energy and the given calorific value: Mass of gunpowder = KE / Calorific value Mass of gunpowder = (0.5 * 0.01 kg * (900 m/s)^2) / 3 MJ/kg

This calculation will give us the mass of gunpowder required to produce the energy for the bullet's flight.

Let's calculate the mass of gunpowder required.