Apotter's wheel—a thick stone disk of radius 0.500 m and mass 115 kg—is freely rotating at 50.0 rev/min. the potter can stop the wheel in 6.00 s by pressing a wet rag against the rim and exerting a radially inward force of 72.0 n. find the effective coefficient of kinetic friction between the wheel and rag.

The slope of a velocity time graph over any interval of time gives the during that interval

How many atoms of nitrogen are in the chemical formula ni(w on

Cells in the nervous system have a potential difference of 70 mv across the cell membrane separating the interior of the cell from the extracellular fluid. this potential difference is maintained by ion pumps that move charged ions across the membrane. is this an emf? select the correct answer and explanation. 1)no. the ion pumps cannot separate charges; thus, they cannot create a potential difference. 2)yes. the ion pumps cannot separate charges, but they still can create a potential difference. 3)yes. the ion pumps can actively separate charge; thus, they can create a potential difference. 4)no. the ion pumps can separate charges, but they cannot create a potential difference.