Q. A 1 kg iron horseshoe is taken from a forge at 900 degrees C and dropped into 4 kg of water at 10 degrees C. Assuming no energy is lost by heat to the surroundings, determine the total entropy change of the horseshoe-plus-water system.
Q. The maximum acceleration of a car, while braking is -8.0 m/s^2. If two identical cars are moving head-on toward each other at 91 km/h, and both drivers apply the brakes when they are 89 m apart. Will the cars collide? If so how fast will the cars be traveling when they collided? If they did not, what is the distance between the cars at this point?