Recent content by danielamartins

Yes, I'm using g=10m/s^2

Thanks! I appreciate it ;)

Homework Statement There's a stationary block (m1=1,5kg) in a table (Coefficient of Friction=0,4). A bullet passes through the block and hits a person. The block moved 1,2m. Calculate the velocity of the bullet (mb=0,0079kg and vib=709,88m/s) when it hit the person. Homework Equations...

My teacher just told me that I couldn't use the Eci=Ed+Efi because the block wasn't moving initially. And told me that I needed to use the Wnc = Δ KE (Wnc being the work done by the friction force). But isn't it the same thing? Plus, can't I use the Eci=Ed+Efi if I consider the "initial moment"...

Thanks! It goes in one side and out the other because it's supposed to hit a "person" after. I'm going to check with my teacher, and I'll post the feedback here tomorrow..

1. I have to create an exercise to calculate the velocity of a block of wood (m=1,5 kg). A bullet passed through a block that was on a table also made of wood. What I really want to calculate is the initial velocity of the bullet, but, in order to do that, I need to know the velocity of the...

Oh thanks! I was making it more difficult than it actually is. I'll try to do all the calculations and then, I'll post them here. If u could take a look I would appreciate it ;)

Thanks, but how can I calculate the acceleration?

Is it possible to calculate the force caused by a bullet in a bone, knowing the velocity of the bullet when fired, its weight, and the bone's thickness? If so, could you explain it a bit? I need to create a sort of exercise, so I wanted to do something involving a bullet and a body. Therefore...