Atrain engine is pulling four boxcars, each of inertia m. the engine can exert a force of magnitude f on what it is pulling. assuming that friction can be ignored, what is the tension in the coupler between the engine and the first car as the train starts off?

answer:   you might love summer weather, but you don’t want it to feel like the sun is inside your car. but a hot car that just won’t seem to cool down might be a bigger of a problem than you think. your car relies on being at the right temperature.

explanation:

the answer is b i think

layers of the earth affect the waves and these effects are seen on instruiments such as seimometers