A system consisting of a block and a horizontally-mounted spring oscillates with simple harmonic motion. The position of the block relative to its equilibrium varies according to the following equation:

x(t)= 2Sin(π/2t+ π/4)

At what time (in s) after t = 0 s is the potential energy of the system first at a maximum?

Try c ? that’s what i got

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.