Question

Пуля, летящая со скоростью 420 м/с, ударяет в стену и проникает в нее на глубину s=20. Определите, какое время она движется внутри стены.

Answer 1

Дано:

υ0 = 420 м/с

s = 20 м

t - ?

Решение:

s = (υ² - υ0²)/(2a)

υ = 0 => s = -υ0²/(2a)

a = -υ0²/(2s)

υ = υ0 + at

0 = υ0 - υ0²/(2s)*t

υ0 = υ0²/(2s)*t | : υ0

1 = υ0/(2s)*t

t = 1/(υ0/(2s)) = 2s/υ0 = 2*20/420 = 40/420 = 4/42 = 1/21 = 0,04761904762 = 0,05 c

Ответ: 0,05 с.

Answer 2

Calculation of Time Inside the Wall

To determine the time it takes for a bullet traveling at a speed of 420 m/s to penetrate a wall to a depth of s=20, we can use the formula:

time = distance / velocity

In this case, the distance is the depth the bullet penetrates into the wall, which is given as s=20. The velocity is the speed at which the bullet is traveling, which is 420 m/s.

Substituting the values into the formula, we get:

time = 20 m / 420 m/s

Calculating this, we find that the time it takes for the bullet to move inside the wall is approximately 0.048 seconds.

Please note that this calculation assumes a constant velocity throughout the bullet's penetration into the wall. In reality, the bullet's velocity may decrease as it encounters resistance from the wall material.