Question

Пуля массой 9г вылетает из ствола винтовки со скоростью 800м/с. Какова её кинетическая энергия?

Answer 1

Е = (m*v^2)/2
9 г = 0, 009 кг
E = (0,009*800^2)/2 = 5760 / 2 = 2880 (Дж)
Ответ: 2880 Дж.

Answer 2

9г=0.009кг
Eк=mV^2/2=0.009*800^2/2=0.009*800*400=90*8*4=2880

Answer 3

Calculation of Kinetic Energy

To calculate the kinetic energy of the bullet, we can use the formula:

Kinetic Energy = (1/2) * mass * velocity^2

Given that the mass of the bullet is 9 grams and the velocity is 800 m/s, we can substitute these values into the formula:

Kinetic Energy = (1/2) * 0.009 kg * (800 m/s)^2

Now let's calculate the result:

Kinetic Energy = (1/2) * 0.009 kg * (800 m/s)^2 = 2880 joules

Therefore, the kinetic energy of the bullet is 2880 joules.

Please note that the above calculation assumes that the bullet is non-deformable and there is no energy loss due to factors such as air resistance or friction.