![]() ![]() However, we have not yet considered the main reason that we cook food: to denature proteins. The original post listed 4.2*10^5 J for heating, so we have a total of 6.4*10^5 J. Thus boiling the water in one such chicken should require about 2.4*10^5 J. The enthalpy of vaporization for water is 40650 J/mol. ![]() Given the original poster's 1.8 kg chicken and the assumption that the lost water evaporates away, this requires evaporating 108 g of water. The USDA says that the water content of a chicken fryer decreases from 66% to 60% upon cooking ( ) I'm pretty sure that your hand has to be moving at close to mach two when you hit the chicken. Quote from: GuitarStv on December 05, 2019, 08:22:48 AM Settle a bet. this leaves a little margin of error with the chicken temprature for losses due to other things (like the exploded bits of chicken bouncing into soft drapes/carpet and losing some energy).ĭouble check my math and assumptions, but I think this is the correct answer. The speed of sound is 343 m/s, so you would need to hit the chicken with your hand at roughly twice that speed (mach 2). We already calculated the amount of energy necessary: 425426.4 J Now let's re-arrange the equation to solve for v: M = mass of the object moving (in this case your hand) So we'll pull out another grade 9 physics formula. which I think is closer to what you really want to know. Let's find out how fast your hand has to be moving to cook the chicken. The number above is the amount of energy you need to deliver in the slap. Therefore the energy needed to cook a chicken through kinetic energy is: The specific heat of a broiler chicken is 3.22 kJ/kgC ( ) so c = 3220 J/kgC Average weight of a chicken is 1.8 kg ( ) so m = 1.8 kg Average fridge temperature is 1.6 degrees C ( ). Let's assume that we're starting with a chicken from the fridge. The safe internal temperature of a cooked chicken is 75 degrees C ( ). ![]()
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