Recent content by pdpax

I go straightly to the answers: Let d=delta, t=temperature, Q=heat, c=Specific heat capacity, m=mass. 1) Q=mcdt=0.25(4200)(30-70)=-42000 => Q= mcdt= m(4200)(30-20) = 42000 => m= 1 Kg. 2) Q[lost by Copper]= -Q[taken by Oil] => mcdt=mcdt => 0.2(420)(50-80)=-0.15(600)(50-t) =>...

Hi everybody, Any one can tell me why the momentum of the wall is 2mv while a ball collides it?

Hi, I had a question about Torque, Internal forces & external forces. Here are 2 examples helping me to state my question: 1) The Earth is rounding the sun with respect to the Sun. The forces which are acting on the system are 2 gravitational forces that are action & re-action. The Force...