6. If a 2 kg block with a volume of 0.003 m3 is fully submerged in a pool of water, what is the buoyant force acting on the block? The mass density of water is 1000 kg/m3. (10 points) 7. If the block in question 6 is placed on the bottom of the pool and let go, what is the net force acting on the block after that? (10 points) 8. Say you have 1 kg of iron and 1 kg of water. You allow each of them to experience a temperature change of 10 degrees Celsius. Which material is likely to experience a more rapid temperature change and why? (10 points) 9. You are building a roller coaster and you want the first hill to have a maximum speed of 35.76 m/s (about 80 mph) at the bottom? How high must the first hill be to accomplish this? (10 points) 10. Two cars are driving towards each other in a straight line. Car A is 1000 kg and driving at 15 m/s. Car B is 1250 kg and driving at 7 m/s. If the two cars collide inelastically, what will be the final momentum of the system? Be careful with the signs of your velocity vectors! (10 points)