Question

Чтобы обладать большей кинетической энергией- пуля массой 9г, движущая со скоростью 800 м/с, или ядро массой 4 кг, имеющее скорость 20 м/с

Answer 1

Е=mv^/2 формула еинетической энергии.Е пули=0,009кг×640000/2=5760/2=2880Дж.
Еядра=4×400/2=800Дж.
Ответ.пуля

Answer 2

Comparing Kinetic Energies

To compare the kinetic energies of a bullet with a mass of 9g moving at a speed of 800 m/s and a 4kg mass moving at a speed of 20 m/s, we can use the formula for kinetic energy:

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

Let's calculate the kinetic energies for both the bullet and the 4kg mass.

For the bullet: Mass (m) = 9g = 0.009kg Velocity (v) = 800 m/s

For the 4kg mass: Mass (m) = 4kg Velocity (v) = 20 m/s

Calculating Kinetic Energies

For the bullet: KE = 0.5 * 0.009 * (800^2) = 2880 Joules.

For the 4kg mass: KE = 0.5 * 4 * (20^2) = 800 Joules.

Conclusion

The bullet with a mass of 9g moving at a speed of 800 m/s possesses a greater kinetic energy of 2880 Joules compared to the 4kg mass moving at a speed of 20 m/s, which has a kinetic energy of 800 Joules.