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To calculate the number of feathers needed to make a weight of 1.4 * 10^3 g, we need to divide the total weight by the weight of one feather:
Number of feathers = Total weight / Weight of one feather
Number of feathers = 1.4 * 10^3 g / 0.0082 g
Number of feathers = 1.71 * 10^5 feathers
Therefore, you would need 1.71 * 10^5 feathers to make a weight of 1.4 * 10^3 g.