Unit 4 Climate Basics Lab Practical on Buoyancy

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Arizona State University *

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111

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Geology

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Feb 20, 2024

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docx

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Question 1 0.5 pts Imagine a six-pound bowling ball. That's generally the lightest you'll find in a bowling alley. Also imagine six pounds of feathers. Your average feathered bedroom pillow weighs about 2 pounds, so imagine three pillows in a stack. You now have six pounds of bowling ball and six pounds of feathers. If you were to take each and throw them into a swimming pool, you would expect the bowling ball to sink and the feathers to float, but why? First, let's figure out their volume. A bowling ball has a radius of 4.25 in, which converts to 10.8 cm. Using the formula to find the volume of a sphere: https://www.mathopenref.com/spherevolume.html Links to an external site. The result is 322 cm 3 . Next, the standard size for a bedroom pillow is 26 in x 20 in x 4 in. When we convert to centimeters, our stacked pillows are 66 cm x 51 cm x 10 cm. The volume is then 33,660 cm 3 . We already know the mass of each object (six pounds), but remember that mass in this formula is measured in grams. You'll first need to convert six pounds to grams. One pound converts to 453.6 g. Round your calculation to the nearest full gram and write it down. Now use the density formula to calculate the density of each object. Round your answers to the nearest one-tenth of a gram (one decimal place). Group of answer choices Bowling Ball: 8.5 g/in 3 Feathers: 0.1 g/in 3 Bowling Ball: 0.1 lb/in 3 Feathers: 8.5 lb/in 3 Bowling Ball: 0.1 g/cm 3 Feathers: 8.5 g/cm 3 Bowling Ball: 8.5 g/cm 3 Feathers: 0.1 g/cm 3 Flag question: Question 2 Question 2 0.5 pts Watch this clip from The Lord of the Rings and jump to 2 minutes. Lord of the Rings: Gollum falls into mount doom Links to an external site. film, did the writers violate the laws of nature? Use your knowledge of density in combination with this reading: GollumInLava.pdf Actions

QUESTION: what should have occurred when Gollum fell from the cliff? (Select all correct answers. You can select more than one) Group of answer choices Both Gollum and the ring should have sunk into the lava. The rapidly rising hot air would cause Gollum to float into the sky instead of falling into the lava. Gollum should have floated on top of the lava instead of sinking. The ring should have sunk into the lava instead of floating. Both Gollum and the ring should have floated in the lava. Flag question: Question 3 Question 3 0.5 pts Watch this video: Dead Sea Floating...a demonstration Links to an external site. The young man is floating in the Dead Sea in Israel. The Dead Sea's salinity is roughly 34%, which means that 34% of the Dead Sea's composition is salts. For comparison, oceans typically have a salinity of 3.5%, roughly one-tenth the salinity of Dead Sea water. Using this information, estimate the density of the Dead Sea and write down your answer. But this is not the answer to the question. Its just a step. Now, imagine a bathtub full of water. Imagine also that you have containers of equal volume with samples of each of the following types of water. One contains water from the Dead Sea. One contains ice (think iceberg). One contains distilled water. One contains ocean water. You place each container in the bath tub, which is full of typical, treated tap water that contains fluoride. The higher the density of the water within the container, the lower it should sink. Order the materials according to their density, from the most to the least. (Ignore the mass of the containers. They're magic, weightless containers.) Group of answer choices Ocean Water / Dead Sea Water / Ice / Bath Water / Distilled Water Dead Sea Water / Ocean Water / Distilled Water / Bath Water / Ice

Ocean Water / Dead Sea Water / Bath Water / Ice / Distilled Water Dead Sea Water / Ocean Water / Bath Water / Distilled Water / Ice Bath Water / Distilled Water / Ice / Dead Sea Water / Ocean Water Flag question: Question 4 Question 4 0.5 pts You've seen density in action before, but you've probably never realized it. Does wood sink in water? No, it floats (until it is water-logged, at least). What else floats in water? A duck! Both float due to their densities being less than that of water. Do very small rocks float in water? No, because they have a higher density than water. These are examples of density in action. There isn't a magic density value, such as 1g/cm 3 , that causes objects to "float". In order for an object to float, its density must simply be less than that of the materials surrounding it. One common way to decrease an object's density is to heat up the object. Think of a hot air balloon. The reason for this is that objects expand (increase in volume) when heated and contract (decrease in volume) when cooled. With this in mind, why do icebergs float in oceans? Group of answer choices Oceans have higher salinity, and thus greater density than icebergs. All of these answers are correct. Water has the unusual property of also increasing in volume when frozen, which lowers its density. Icebergs are composed of frozen fresh water, not saltwater, that break away from glaciers.

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