A cable 12 m long and weighing 2.5 kg/m hangs vertically from a pulley system at the top of a building. A steel beam of mass 250 kg is attached to the end of a cable. The work required to pull the steel beam to the top of the building is given by:

Describe different biomes. what are some adaptations that organisms (plants or animals) must have to live in each biome?

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.

How are the crust and the inner core alike? a) they are both solid. b) they both have the same temperature. c) they are both under the same pressure. d) they are both very close to the center of the earth.