Recent content by pauln

Homework Statement A 10g bullet moving at 300 m/s hits and passes through a 2.2 kg pendulum target. After impact the 1.2 m long pendulum rises up an angle of 15 degrees. Find the final speed (Vf) of the bullet. http://img233.imageshack.us/img233/7566/34494449gz4.png Homework Equations...

argh i got it, I was thinking the start of the handle was a pivot so i was backwards in thinking for terms of distance thanks for clearing it up :)

im still confused i got torque for the whole bottle opener (t=40*.3) and i got torque for the opener coming in contact with the edge of the lid (t=40*.25) the answer is 240 N but i come no where close to it :cry:

Homework Statement To remove a bottle cap, a student exerts a force of 40 N on the opener. What is the force on the exerted edge of the cap by the opener? http://img225.imageshack.us/my.php?image=22965751hd6.png Homework Equations sigma(Tccw) = sigma(Tcw) t=r*d The Attempt at a...

thanks it took me 15 or so minutes but i got it :smile:

Homework Statement A 1200 kg rocket car is placed at the bottom of a 100 metre long ramp inclined at 10 degrees. The rocket is turned on and it exerts a force of 8300 N for 5.7 seconds, and then it shuts down. Find the speed with which the rocket car leaves the ramp (assume frictionless)...