What does the surface of a calm lake have in common with a contour line?

Suppose a suitcase has a mass of (m) 30 kg and a net force (n) of 10 kg*m/s. what is the acceleration rate of the suitcasein m/s? show your work to support your answer

The idea of spontaneous generation was disproved by in a experiment involving jars of meat

Someone me with this: a mineral' is determined by its actomic structure.