Atrain consists of 50 cars, each of which has a mass 6.8
x10^3 kg. the train has an acceleration of +8.0 x 10^-2m/s^2.
ignore friction and determine the tension in thecoupling a) between
the 30th and 31st cars and b) between the 49thand 50th cars.

Selma made a diagram to compare convection and radiation. which label belongs in the area marked x? must involve temperature differences between substances or objects only occurs when molecules are in direct contact involves the movement of fluids based on density differences can occur where there is little or no matter