Carbon in the carcass - radioactive, Science

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1. A cyclist ascends a hill of height 120 meters. The mass of cyclist plus bicycle is 100 kilograms. His efficiency is 25%. How many Calories does he burn?

2. A hiker in the Swiss Alps finds the carcass of an extinct mammal preserved in ice. The carbon in the carcass is found to be one fourth as radioactive as that in a living body. If the half-life of carbon-14 is 5730 years, how long ago did this animal die?


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