Efficiency of a standard 60 w lightbulb

What happens when you slowly pulled the carboard?

Consider two less-than-desirable options. in the first you are driving 30 mph and crash head-on into an identical car also going 30 mph. in the second option you are driving 30 mph and crash head-on into a stationary brick wall. in neither case does your car bounce off the thing it hits, and the collision time is the same in both cases. which of these two situations would result in the greatest impact force?

You have 80 g of 60oc water and 80 g or 10oc water. what is the final temperature when the two are mixed? explain.