The rigidly connected unit consists of a 2.5-kg circular disk, a 2.5-kg round shaft, and a 3.4-kg square plate. Determine the z-coordinate of the mass center of the unit.

During takeoff, the sound intensity level of a jet engine is 170db at a distance of 34 m. what's the sound intensity level at a distance of 1.0 km?

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 !

4. if you were an astronaut on the moon, what would you experience? what would you see from your perspective?