10 points David Blaine Ascension Helium shortages are becoming increasingly common, causing both scientists and the medi

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10 Points David Blaine Ascension Helium Shortages Are Becoming Increasingly Common Causing Both Scientists And The Medi 1 (72.42 KiB) Viewed 39 times

10 points David Blaine Ascension Helium shortages are becoming increasingly common, causing both scientists and the medical community to compete with recreational users of the gas (think party balloons) for supply, which drives up the cost. The gas is an essential component to help cool superconducting magnets used in MRI imaging, for example. There is simply no other element on Earth that can effectively keep the magnets as cold as necessary to allow for the high field strength, stable and uniform magnetic fields that make modern MRI systems possible. Critical shortages have occurred in each of the last 2 years, such that scientists were forced to shut down their superconducting magnets. As you can see in the graph, since 2000, the amount of this non-renewable gas in storage versus production has plummeted. LAN DAVID BLAINE -Production ge ASCENSION Watch on YouTube UM However, there has been a global reprieve currently due to lack of demand as a result of the COVID pandemic. In September of this year, illusionist David Blaine decided to recreate the famous scene in the Pixar film "Up", by strapping himself to 52 hellum filled balloons. He was roundly criticized for his wastefulness of the gas during the stunt. Here.. you will estimate how much helium was used in Blaine's stunt, to ascertain whether criticisms over Helium wastefulness were warranted. This problem will also use the stunt as an example of buoyancy, with air as the medium vs water, as well as terminal velocity.David Blaine began his ascent at approx 1:55:58 in the video above, and released himself at approx 2:45:17, at a height of 24,900 ft. He was falling until 7000 ft, when he deployed his parachute. Use 3 sig figs: (a) Calculate his time of ascent type your answer..... (b) Calculate his acceleration type your answer.. (c) Draw a free body diagram of Blaine, and use it to calculate the total Buoyant force of the balloons, that cause his ascent, if his mass is 90 kg (this is the same as his mass before his fasting stunt). type your answer... (d) If we use the average of the air density between sea level and 25000 ft of 0.633 kg/m3, calculate the volume of the balloons. type your answer... (e) Convert this to cubic feet, and determine how many Hellum tanks were required based upon standard 242 cubic ft tanks. type your answer... (f) Is this significant, such that criticism over wastefullness is warranted? type your answer... (h) Draw a free body diagram of Blaine in free fall with Drag, and calculate his terminal velocity, in mph, using the same air density, 1.2 skydiver coefficient, and an estimated half meter area. type your answer... (1) Calculate how long he is in free-fall (arguably the most thrilling part of the ride). type your answer.. A i I B g Share