Atrain car of mass 3,825 kg sits at rest on the track. a second car of mass 5,169 kg moving at 6 m/s slams into it and they stick together. what is the combined speed of the train cars after the collision?

Which property of fossils allow scientists to determine the relative rock ages..

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.

What is friction? how does it affect the motion of an object?