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Question 1 How long would it take to defrost a frozen elephant? Let's estimate this by scaling from the example of a frozen chicken. To
Question 1 How long would it take to defrost a frozen elephant? Let's estimate this by scaling from the example of a frozen chicken. To defrost something, enough heat must pass into it to overcome the latent heat of melting. Elephants and Chickens are mostly made of the same sort of stuff (muscles, fat etc-all mostly water), so they probably have very similar densities and latent heat values. Let's also do the good Ninja physics trick of approximationg them as having the same size and shape-perhaps a sphere... Elephant Ninja Physicist view of elephant and chicken... Chicken The defrost time will be set by the relationship between the rate at which heat is transferred into the elephant or chicken (heat transfer) and the amount of energy needed to defrost it. What should the rate of heat transfer into the chicken or elephant depend on? Select one: Select one: O The length (radius, circumference or diameter) _ or O The volume V oc 73 O The surface area A oc 72And what should the total amount of heat needed to defrost the chicken or elephant depend on? Select one: Select one: The mass or volume V oc 73 O The surface area A ocr2 O A length, such as radius, diameter or circumference L or Check How long will something take to defrost? The time must scale with the total heat required divided by the rate at which heat flows into the frozen object. We've just worked out how the total heat and the heat flow rate depend on the linear size of the object r. Using these results, how should the time to defrost depend on the linear size R? Select one: Select one: O Defrost time T is independent of r O Defrost time T oc r2 O Defrost time To r-1 O Defrost time T o r O Defrost time T orA frozen chicken has r ~ 10 cm- Roughly what is the radius of the torso of an elephant? Select one: Select one: O 10 cm O 1m O 10 m O 100 m O 1,000 m Check Based on your answers to the last two questions, and given that a frozen chicken takes around 5 hours to defrost, how long should a frozen elephant take
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