An object sits at the edge of a table top with a mass of 180 kg. it is connected by a magical physics thread to a mass of 250 kg via a pulley which is hanging in the air below the edge of the table top. there is an unknown amount of friction between the 180 kg mass and the table. the entire thing is accelerating at 2 m/s/s towards the edge of the table (250 kg mass is moving down).
what is the force of friction?
what is the coefficient of friction?

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !