Arailroad car with a mass of 11 000 kg collides and couples with a second car of mass 19 000 kg that is initially at rest. the first car is moving with a speed of 4.5 m/s prior to the collision. a. what is the initial momentum of the first car? b. if external forces can be ignored, what is the final velocity of the two railroad cars after they couple?

Heterogeneous mixture with larger particles that never settle is

Awave with a frequency of 500 hz is traveling at a speed of 100 m/s. what is the wavelength?

Imagine an isolated positive point charge q (many times larger than the charge on a single proton). there is a charged particle a (whose charge is much smaller than charge q) at a distance from the point charge q. on which of the following quantities does the magnitude of the electric field created by charge q at particle a's position depend? check all that apply. the type of the charge on the charged particle athe relative orientation between q and a (while the distance between q and a is fixed)the specific location of the charged particle a (while the distance between q and a is fixed)the amount of the charge on the point charge qthe specific location of the point charge q (while the distance between q and a is fixed)the distance between the point charge q and the charged particle athe amount of the charge on the charged particle a