Consider a system to be two train cars traveling toward each other. What is the total momentum of the system before the train cars collide?

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.

Find the equation for the plane through upper p 0 left parenthesis negative 4 comma negative 8 comma negative 5 right parenthesis perpendicular to the following line. xequalsnegative 4 minus t, yequalsnegative 8 plus 2 t, zequals3 t, minusinfinityless thantless thaninfinity

Earth's atmosphere is composed of mostly two gases. name the two gases that make up the majority of the atmosphere and use the pie chart to tell the percentages of each.