A disc magnet is used to hold a piece of paper (0.1 mm thick) to the steel door of a refrigerator. The magnet is 6 cm in diameter and 0.75 cm thick. Its mass is 500 grams. Assuming that the coefficient of friction between the paper and the refrigerator is 0.3, what is the minimum remanent magnetism that the magnet must have in order to keep the magnet and paper from falling

Ithink the answer would be 1,350!

The low lands i believe

How is it possible that phylogenies based on sequences from nuclear genomes and organellar genomes (i.e., chloroplasts and mitochondria) from the same group of species yield phylogenetic trees with different branching orders?   answer :   the genome of the endosymbiont is more closely related to members of the group in which it originally evolved, while the nuclear genome of the engulfing organism has its own evolutionary trajectory.