As demonstrated in lecture, a Van de Graaff generator (VGG) is a machine that can separate charges on two different conductive spheres. It used a belt to transport electrons off of a large, conductive sphere. The electrons were moved to a different conductive sphere, creating a large potential difference between the two spheres. In other words, it is an electrostatic generator. If a person holds onto the large sphere while the VGG is active, s / he will lose electrons at the same rate as the sphere, until connection is broken. If a conductive metal disk is connected to an active VGG, the disk will lose electrons at the same rate as the sphere. A 60 kg person is standing on a thin, conductive disk (the person is wearing thick rubber shoes, so the person is electrically separate from the conductive disk). The disk is connected to a VGG and the person places a hand on an identical, but separate VGG. If each of the VGG are activated (turned on) at the same instant and both remove electrons at a rate 500 determine: a. The amount of time the person would have to hold onto the VGG to float 1 mm above the conductive disk. b. The amount of mass that the person will gnin or lose during this time. Did the person gain or lose this mass?

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

i would say

bacteria that live on the ocean floor are sustained by phytoplankton. phytoplankton, microscopic marine photosynthetic organisms, have a vastly significant role to play not only in the marine food web of which they’re part of, but also on a more global scale. despite their infinitely small size in comparison to other marine organisms, these tiny creatures occupy an immensely important ecological niche: they are the foundation of the marine food web, and as primary producers, play key roles in supporting all other organisms in the marine environment, as well as in the regulation of the earth’s climate through the sequestration of carbon, oxygen production, and other related processes. phytoplankton account for roughly half of all global primary productivity; therefore, their significance extends far beyond the marine environment alone. there is an intriguing sense of irony in the realization that these tiny living beings that often live out their existence unnoticed and undetected by the rest of the world, have such a far-reaching impact on the lives of virtually all other living organisms on the planet, particularly on those in the marine environment. the world that we have become accustomed to has been and is continuously shaped by the workings of these miniscule yet vital “plants of the sea”.

hope this !