A food Calorie is a unit of energy equal to about 4184J. When you consume a...
A food Calorie is a unit of energy equal to about 4184J. When you consume a 100 Calorie doughnut, that energy is stored in your body unless you use it (conservation of energy, folks).
(a) How much work do you do when you lift yourself (assume m “ 80kg) up one stair? Note: The typical stair in the US is about 18cm.
(b) How many times do you need to walk up the Exorcist stairs (about 80 stairs) to work off the doughnut?
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A food Calorie is a unit of energy equal to about 4184J. When
you consume a...
A 63-kg woman cheats on her diet and eats a 440-Calorie (440 kcal) jelly doughnut for...
A 63-kg woman cheats on her diet and eats a 440-Calorie (440 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of one jelly doughnut? (b) How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm stairs (c) If the human body is only 28% efficient in converting chemical energy to mechanical...
a 54kg woman cheats on her diet and eats a 615 calorie(615 kcal) jelly doughnut for...
a 54kg woman cheats on her diet and eats a 615 calorie(615 kcal) jelly doughnut for breakfast. a) how many joules of energy are the equivalent of one jelly doughnut? b) how many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? assume the height of a single stair is 15cm. c) if the human body is only 20% efficient in converting chemical energy to mechanical energy, how...
A 55-kg woman cheats on her diet and eats a 540-Calorie (540 kcal) jelly doughnut for...
A 55-kg woman cheats on her diet and 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 stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm. (C) If the human body is only 25% efficient in converting chemical energy to mechanical energy,...
A 52-kg woman eats a 640 Calorie (640 kcal) jelly doughnut for breakfast. (a) How many...
A 52-kg woman eats a 640 Calorie (640 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of one jelly doughnut? _________ J (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 cm. _________ stairs (c) If the human body...
Converting the energy of one food calorie into mechanical energy, how high could you lift a...
Converting the energy of one food calorie into mechanical energy, how high could you lift a 196-lbs person?
2. Running up the stairs (5 pts). Time how long it takes for you (or a...
2. Running up the stairs (5 pts). Time how long it takes for you (or a friend) to run as fast as possible up a staircase. Measure the height of one step and count the steps to find how high you climbed. a) How much mechanical energy did you produce to climb the stairs? b) What was the average mechanical power produced during your climb? c) Estimate the muscle mass in your upper legs (quadriceps, hamstrings, and buttocks). (Recall that...
If you just stand still on an escalator (moving stairway), it takes 20 seconds for it...
If you just stand still on an escalator (moving stairway), it takes 20 seconds for it to carry you up one floor, about 5 meters. But if you walk up, you get to the top of the escalator in only 12 seconds. (a) How much work does the escalator do in lifting you up to the next floor, it you just stand there? (b) How much if you walk up the escalator? (c) Some people expect the answer in part...
A. Food Energy. Energy is stored in food as the potential energy of the electrical bonds...
A. Food Energy. Energy is stored in food as the potential energy of the electrical bonds in molecules. Your body converts food energy to mechanical energy and heat. Food energy is expressed in “calories”, which are actually kilocalories (kcal, with 1 kcal= 4.185 kJ) How many joules are in a 130-kcal serving of breakfast cereal? B. A glass of 1 percent milk contains 130 kcal. How many glasses would a 70-kg person have to drink to get the energy needed...
A human being must consume about 2500 Calories (Kilocalories) of energy in his or her food...
A human being must consume about 2500 Calories (Kilocalories) of energy in his or her food each day in order to continue to function properly. This means that he or she uses up energy at a rate (power) of 2500 Kilocalories /day. Using the fact that this rate of energy usage is about the same as a 100 watt light bulb, can you be replaced by a 100 watt light bulb? Explain.
Each pound of fat contains 3500 food calories. When the body metabolizes food, 80.5% of this...
Each pound of fat contains 3500 food calories. When the body
metabolizes food, 80.5% of this energy goes to heat. Suppose you
decide to run without stopping, an activity that produces 1340 W of
metabolic power for a typical person.
Part A) For how many hours must you run to burn up 1 lb of
fat?
Part B) If you followed your planned exercise program, how much
heat would your body produce when you burn up a pound of fat?...
A 63-kg woman cheats on her diet and eats a 440-Calorie (440 kcal) jelly doughnut for breakfast. (a) How many joules of energy are the equivalent of one jelly doughnut? (b) How many stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm stairs (c) If the human body is only 28% efficient in converting chemical energy to mechanical...
A 55-kg woman cheats on her diet and 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 stairs must the woman climb to perform an amount of mechanical work equivalent to the food energy in one jelly doughnut? Assume the height of a single stair is 15 cm. (C) If the human body is only 25% efficient in converting chemical energy to mechanical energy,...
A human being must consume about 2500 Calories (Kilocalories) of energy in his or her food each day in order to continue to function properly. This means that he or she uses up energy at a rate (power) of 2500 Kilocalories /day. Using the fact that this rate of energy usage is about the same as a 100 watt light bulb, can you be replaced by a 100 watt light bulb? Explain.
Each pound of fat contains 3500 food calories. When the body
metabolizes food, 80.5% of this energy goes to heat. Suppose you
decide to run without stopping, an activity that produces 1340 W of
metabolic power for a typical person.
Part A) For how many hours must you run to burn up 1 lb of
fat?
Part B) If you followed your planned exercise program, how much
heat would your body produce when you burn up a pound of fat?...
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