According to clocks on the ground (system s), streetlights a and b (situated 4 km apart) were both turned on at precisely 8: 00p. m. which one went on first according to an observer on a train (system s') which moves from a to b at 3/5 times the speed of light? how much later (in seconds) did the other light go on?

Write the equation for momentum, first using symbols for the variables, then using words for the variables.

The two required components for a generator are

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 !