Calories. A food calorie (or kilocalorie, the only type we'll use in this problem) is a...

 

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Calories. A food calorie (or kilocalorie, the only type we'll use in this problem) is a unit of energy equal to 4,184 J. A gram of protein or carbohydrate has about 4 calories of food energy. Fat has about 9 calories per gram. Alcohol has about 7 cal/g. (a) How much work do you do against gravity to climb up four stories of stairs (a story is about 3.1 min residential buildings)? Give your answer in food calories. How many calories per step (8 in per step)? Assume m = 60 kg. Keep in mind that the human body is not very efficient, and it uses much more energy to actually move around than the work done against gravity. (b) What is the equivalent energy of climbing four stories in kilowatt-hours (kWh), a common unit of energy in home and car batteries? A watt-hour is the energy used by a 1 W device for one hour. (c) How much gasoline contains the same amount of energy to climb four stories of stairs? Burning gasoline releases about 11 calories per gram. Calories. A food calorie (or kilocalorie, the only type we'll use in this problem) is a unit of energy equal to 4,184 J. A gram of protein or carbohydrate has about 4 calories of food energy. Fat has about 9 calories per gram. Alcohol has about 7 cal/g. (a) How much work do you do against gravity to climb up four stories of stairs (a story is about 3.1 min residential buildings)? Give your answer in food calories. How many calories per step (8 in per step)? Assume m = 60 kg. Keep in mind that the human body is not very efficient, and it uses much more energy to actually move around than the work done against gravity. (b) What is the equivalent energy of climbing four stories in kilowatt-hours (kWh), a common unit of energy in home and car batteries? A watt-hour is the energy used by a 1 W device for one hour. (c) How much gasoline contains the same amount of energy to climb four stories of stairs? Burning gasoline releases about 11 calories per gram.

Answer rating: 100% (QA)

a To answer the question we need to calculate the work done against the gravity and then convert it ... View the full answer