Recent content by Chica1975

Homework Statement a 5.00g object moving to the right at 20.0cm/s makes an elastic head-on collision with a 10.0g object that is initially at rest. Find the velocity of each object after the collision. Homework Equations p=mv m1v1 +m2v2/m=m1=m2 The Attempt at a Solution I have...

Homework Statement A car of mass 950kg traveling at 60km/h in an easterly direction collided perfectly inelastically with another care of mass 1250kg traveling at 55.0km/h in a northerly direction. The design of the smaller care incorporated safety features which ensured that any occupants...

thank you very much - I got it out!

thank you, I understand everything except for the following what do you mean by balance, and how does the parallel force balance kmgcos37?

to be honest I have no idea i have drawn the free body diagram 3 times now and have tried to find numbers for the forces acting on it. First of Newton's laws is inertia, no 2 is sumF= ma, third is that there is always a reaction to any action. I can't see how I can derive the friction from...

Homework Statement in a demonstration designed to determine the coefficient of friction for a book on a wooden plank, one end of the plank was raised until the book on it began to slide. if sliding commenced when the plank was at an agle of 37 degrees above the horizontal, what was the...

to be honest I don't know - it must reduce kinetic energy or change it in some way becoz friction is going in the opposite direction? I am completely lost.

a bit lost

is it potential energy? PE = mgh?

basically I tried using each of the above and nothing worked I even tried .5mvfE2 -.5mv0E2 - nothing works

Homework Statement in an emergency stop on a level dry concrete road the magnitude of the friction force when sliding is approx 80% of the weight of the vehicle. What stopping distance is required for a vehicle traveling at 88km/h (24.444 m.s)? Assume that all the wheels lock when the...

i will try again

divide

more I thought I had taken care of that by * by 60? Where am I going wrong?

can you please explain the conservation law to me - I have read the book several times but our language is not attuned. In a simple way please tell me what it means. thanks I have tried everything I can think of with momentum but I don't understand about the law of conservation of momentum...