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 to climb a hill of 236-m, assuming all the milk’s energy is converted to her potential energy?
C. Use of food energy. When the body "burns" food, only about 20% of the food energy is available as mechanical energy. Suppose that a 69-kg person consumes ice cream containing 302 kcal. How high a hill would he have to climb to “work off” those calories? Give your answer in meters.
Homework Answers
Add Answer to:
A. Food Energy. Energy is stored in food as the potential energy
of the electrical bonds...
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...
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 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...
The human body converts internal chemical energy into work and heat at rates of 60 to...
The human body converts internal chemical energy into work and heat at rates of 60 to 125 W (called the basal metabolic rate). This energy comes from food and is usually measured in kilocalories [1 kcal = 4.186 kJ]. (Note that the nutritional `Calorie' listed on packaged food actually equals 1 kilocalorie). How many kilocalories of food energy does a person with a metoblic rate of 109.0 W require per day? (Assume 100 percent efficiency.)
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...
How many kilocalories of heat does an expenditure of 703 kJ produce? _____ kcal A pound...
How many kilocalories of heat does an expenditure of 703 kJ produce? _____ kcal A pound of body fat stores an amount of chemical energy equivalent to 3500 Cal. When sleeping, the average adult burns or expends about 0.45 Cal/h for every pound of body weight. How many Calories would a 151 lb person burn during 7 hours of sleep? (Note that 1 Cal = 1 kcal.)______Cal How much heat in kcal must be added to 0.41 kg of water...
The human body is about 25%% efficient at converting food energy into mechanical output. The remaining...
The human body is about 25%% efficient at converting food energy into mechanical output. The remaining 75%% are lost to heat or waste products. If you spend 1.01 MJ of "useable" energy how many food calories (i.e. kcal) do you burn in total?
You will need two numbers for this part: (a) the average energy per person used in...
You will need two numbers for this part: (a) the average energy per person used in the US every day and (b) the average energy a person consumes in food calories each day. You should cite the source of the information for at least (a). How many times more energy the average person needs for all uses compared to food? (Hint: Recall that food calories are in fact kilocalories).
A student had a medium double double coffee from Tim Hortons. The health-conscious student then looks...
A student had a medium double double coffee from Tim Hortons. The health-conscious student then looks up the nutritional value of the beverage, and is surprised to see it listed as 230. kcal. With the coffee, the student weighs 71.61kg. The student decides to climb the stairs to their apartment to burn off the calories. Each flight of stairs raises the students by 3.00m of altitude. Assuming the student burns as much nutritional energy as the student converts into potential...
1.A pound of body fat stores an amount of chemical energy equivalent to 3,500 Cal. When...
1.A pound of body fat stores an amount of chemical energy equivalent to 3,500 Cal. When sleeping, the average adult burns or expends about 0.40 Cal/h for every pound of body weight. How long would the person have to sleep continuously to lose 1 lb of body fat? (Assume the person weighs 145 lb.) h 2.On a brisk walk, a person burns about 365 Cal/h. At this rate, how many hours of brisk walking would it take to lose 1...
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 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...
Most questions answered within 3 hours.
-
A sample survey at a supermarket showed that 204 of 300 shoppers
regularly use cents-off coupons....
asked 1 minute from now -
Disease Prevention and Health Promotion-Topic
What are the roles of both the state and federal government...
asked 3 minutes ago -
determine the following probabilites
a. for n= 3 and (pie)π = 0.16, what is P(X=0)?
b....
asked 6 minutes ago -
Why do men earn more money than women in America?
asked 16 minutes ago -
Sales of tablet computers at Ted Glickman's electronics store
in Washington, D.C., over the past 10...
asked 26 minutes ago -
Short essay question:
First, discuss the anatomical differences between Paleocene
pro-primates and Eocene eu-primates and explain...
asked 26 minutes ago -
Suppose we have a binomial experiment in which success is
defined to be a particular quality...
asked 47 minutes ago -
march the type of cellular control with the description: enzyme
induction and the enzyme repression. How...
asked 57 minutes ago -
Brief Exercise 5-09 (Part Level Submission)
The following information relates to Blue Spruce Corp. for the...
asked 57 minutes ago -
An unknown amount of a compound with a molecular mass of 284.04
g/mol is dissolved in...
asked 1 hour ago -
You are at rest at a stop sign. There is another stop sign that
is 100...
asked 1 hour ago -
Calculate the equilibrium electrode potential for Fe3+/Fe2+
redox system, if the initial concentration of Fe2+ is...
asked 1 hour ago