Arailroad car of mass m moving at a speed v1 collides and couples with two coupled railroad cars, each of the same mass m and moving in the same direction at a speed v2.

(a) what is the speed vf of the three coupled cars after the collision in terms of v1 and v2? vf =

(b) how much kinetic energy is lost in the collision? answer in terms of m, v1, and v2. ? ke =

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

Light traveling in water, nwater = 1.33, strikes a plastic block at an angle of incidence of 51.4°; part of the beam is reflected and part is refracted. if the index of refraction of the plastic is 2.0, what is the angle made by the reflected and refracted beams?

The chart shows the costs and shipping times for materials that a company needs to build a new product. which describes the best trade-off if the company needs to start building their product within the next two years? they should order the domestic materials because it is always best to choose the fastest shipping time. they should order the imported materials because it is always best to choose the lowest cost for materials. since the shipping time is longer, they should order the domestic materials because the additional cost is worth it to get the materials in time. even though the shipping time is longer, they should order the imported materials because they are less expensive and should arrive in plenty of time to build the product.