Railroad car A rolls at a certain speed and collides inelastically with car B of the same mass. After the collision the cars stick together.

How does their speed after the collision vAB compare with the initial speed of car A vA0?
Express your answer using two significant figures.

vAB/vA0=

Which of the following is not am example of a polymer? protein nylon kevlar concreta

Identify the theory that can be used to explain each phenomenon. answers diffraction: wave theory interference: wave theory reflection: both particle and wave theories refraction: both particle and wave theories

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.