The brakes in a car increase in temperature by ∆Twhen bringing the car to rest froma speedv. How much greater would ∆Tbe if the car initially had twice the speed?Explain. You may assume the car stops fast enough that no heat transfers out of thebrakes.

When fat comes in contact with sodium hydroxide, it produces soap and glycerin. determine whether this is a physical change or a chemical change. explain your answer

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 !

How do we measure or think of speed in the united states?