A 55.0-kg woman eats a 540 Calorie (540 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of one jelly doughnut? (b) How many steps must the woman climb on a very tall stairway to change the gravitational potential energy of the woman–Earth system by a value equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15.0 cm. (c) If the human body is only 25.0% efficient in converting chemical potential energy to mechanical energy, how many stepsmust the woman climb to work off her breakfast?

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A: The total energy burns is, Eburn=1.2 kcal/min8 hours60 min1 hour+1.7 kcal/min16 hours60 min1…

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Q: Suppose that a 59 kg boy and a 48 kg girl rode a car. They a traveled a 9 km distance. In 5.4 s,…

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Q: Give an explanation of how food energy (calories) can be viewed as molecular potential energy…

A: Given: Food energy can be viewed as molecular potential energy is discussed below.

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Q: A 55.0kg woman eats a 540 Calorie jelly doughnut for breakfast. (a) How many joules of energy are…

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Q: (a) How many joules of energy are the equivalent of one jelly doughnut? (b) How many stairs must the…

A: The weight of the woman is w=58 kg. The woman eats 555 kcal.

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A: we do not use brakes with more than 80% efficiency in automobiles

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Q: A 46-kg woman cheats on her diet and eats a 555-Calorie (555 kcal) jelly doughnut for breaktast. (a)…

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Q: A 46-kg woman eats a 522 Calorie (522 kcal) jelly doughnut for breakfast. (a) How many joules of…

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Q: The internal energy of a 5-kg suitcase starts at 150 kJ. The suitcase is mangled as it travels…

A: Given data, Internal energy of the suitcase = 150 kJ Work done on the suitcase = 10 kJ Heat loss…

First law of Thermodynamics

The word thermodynamics consists of two words: thermo- and dynamics. Dynamics means the study of motion. The field of thermodynamics is all about the study of the movement of heat. In a more meaningful way, it is stated as the study of the transfer of energy. Energy transfer is something that we encounter in day-to-day life. Automobiles, chemical reactions, refrigerators, and power generators work on the basis of thermodynamic principles.