reviews the concepts that are involved in this problem. A child is twirling a 0.0275-kg ball on a string in a horizontal circle whose radius is 0.102 m. The ball travels once around the circle in 0.665 as. (a) Determine the centripetal force acting on the ball. (b) If the speed is doubled, by what factor does the centripetal force increase

The speed was not exceeded so it was slow

Gas will most likely  fill the container 

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.