Consume Compla Physics 110 Homework #7 This is an optional, extra credit homework: up to 20 points added to HW total. Must explain all answer and show calculations for full credit 1.A rectangular block is suspended by a string in a beaker of water so that the block is completely surrounded by water. Is the water pressure at the bottom of the block equal to, greater than, or less than the water pressure on the top of the block? Explain your answer 2. Use your answer to #1 to explain why there is a Buoyant force on objects submerged in water 3. What determines whether an object floats or sinks in water? 4. Is it possible for an object to float in salt water but sink in fresh water? Explain Standard P 5. Atmospheric pressure is about 100,000Pa which would result in a force of 100,000N on 1m. If our bodies are subject to atmospheric pressure why aren't we crushed by such a large force? 6. The titanic was made of very dense materials that sink in water. How was the titanic able to float and why did it later sink? 7. A steady stream of water flowing in a narrow pipe reaches a point where the pipe widens. Does the speed of the water increase, decrease or remain the same when the pipe widens? Explain 8. If you blow between two limp pieces of paper held handing down a few inches apart, will the pieces of paper come together or move farther apart? Explain 9. In a hydraulic lift a force of 600N is applied to a smaller piston of area of 0.001m. What force will be exerted on the larger piston if its area is 0.2m? 10. An object has a mass of 600kg and a volume of 0.500m a) What is the buoyant force on the object when it is submerged in water? b) Will the object float or sink? Explain Population Variance: 2 = ( - x)7