- #1

duchuy

- 79

- 3

- Homework Statement
- How deep in a tree would a mass m firearm projectile penetrate at velocity v0 if the frictional force between the projectile and the wood is C ?

- Relevant Equations
- d = mv^2 / 2C

Hi, I was given this exercice where I have to calculate the penetration distance, knowing that m = 20g, v = 300km/h and C = 750 N and I have to give the results with two significant numbers. I really thought that all I had to do was replace the values so I did :

d = (20.10^-3) x (300/3,6)^2 / 2x750 and I ended up with d = 0,0925925925...

But when I entered the answer with two significant figures = 0,093, the answer was wrong.

Please help me find me find my mistake thank you so much!

Sorry if i have misused any term, I translated this from french.

d = (20.10^-3) x (300/3,6)^2 / 2x750 and I ended up with d = 0,0925925925...

But when I entered the answer with two significant figures = 0,093, the answer was wrong.

Please help me find me find my mistake thank you so much!

Sorry if i have misused any term, I translated this from french.