Question

A 10 g-bullet leaves an 80cm long barrel of a rifle at a velocity of 400m/s. What is the average force on the bullet while it is in the rifle?

Answer 1

The average force on the bullet while it is in the rifle is 0.05 N. To find the average force on the bullet while it is in the rifle, we can use the equation: Force = mass x acceleration.

Step-by-step explanation:

To find the average force on the bullet while it is in the rifle, we can use the equation:

Force = mass x acceleration

First, convert the mass of the bullet from grams to kilograms:

10 g = 0.01 kg

Next, we need to find the acceleration of the bullet inside the rifle. We can use the equation:

Acceleration = change in velocity / time

The change in velocity is the final velocity (400 m/s) minus the initial velocity (0 m/s). The time is the time it takes for the bullet to leave the barrel, which is equal to the length of the barrel (80 cm) divided by the muzzle velocity (400 m/s).

Plugging in the values:

Acceleration = (400 m/s - 0 m/s) / (80 cm / 400 m/s)

= 5 m/s²

Now we can calculate the average force:

Force = 0.01 kg x 5 m/s²

= 0.05 N

Therefore, the average force on the bullet while it is in the rifle is 0.05 N.