A 1000-n crate rests on the floor. How much work is required to move it at constant speed (a) 5. 0 m along the floor against a friction force of 230 n, and (b) 5. 0 m vertically?.

Efficiency is an action of doing something. for example when you take a test. good efficiency means you did well but bad effeciency or no effiency means you did bad.

Amplify and switch electrical power and electronic signals

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.