The force f newtons between two magnetic poles is given by the formula f=1/(500r^2), where rm is their distance apart. find the rate of change of the force when the two poles are 0.2m apart and the distance between them is increasing at a rate of 0.03ms^-1

Since the pully is a simple machine so the mechanical advantage is a 1

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.

A=v^2/r solve for r hope that  

When the warmer parts go up and the colder parts go down in a circular motion.