By jogging, a girl is converting food energy into internal energy at the rate of 399 kcal/h above her basal metabolic rate (BMR). Some of this additional internal energy immediately goes into work done at a rate of 56.1 W. The rest of this additional energy would go into raising her temperature, but it is instead eliminated by evaporation of perspiration to keep her body temperature constant. Assume that the heat of evaporation of water at body temperature is equal to its heat of vaporization at 100ºC. (a) Determine the hourly rate (in kg/h) at which water must evaporate from her skin. kg/h (b) When fat is metabolized, hydrogen atoms in fat molecules are transferred to oxygen to form water. Assume that the metabolism of 1.00 g of fat generates 9.00 kcal of energy and produces 1.00 g of water. What percent the water needed is generated by burning fat? %

By jogging, a girl is converting food energy into internal energy at the rate of 399 kcal/h above her basal metabolic rate (BMR). Some of this additional internal energy immediately goes into work done at a rate of 56.1 W. The rest of this additional energy would go into raising her temperature, but it is instead eliminated by evaporation of perspiration to keep her body temperature constant. Assume that the heat of evaporation of water at body temperature is equal to its heat of vaporization at 100ºC. (a) Determine the hourly rate (in kg/h) at which water must evaporate from her skin. kg/h (b) When fat is metabolized, hydrogen atoms in fat molecules are transferred to oxygen to form water. Assume that the metabolism of 1.00 g of fat generates 9.00 kcal of energy and produces 1.00 g of water. What percent the water needed is generated by burning fat? %

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

See similar textbooks

Related questions

Q: (a) The average mpg rating for an older model of a car is 25.3 miles to the gallon and it takes 6.40…

Q: In exercising, a weight lifter loses 0.197 kg of water through evaporation, the heat required to…

Q: A 5.0-kg block of aluminum is heated from 20°C to 90°C at atmospheric pressure. Find (a) the work…

A: Part A:

Q: A workshop with well-insulated walls and containing 800 m of air at 305 kK is ted at constant…

A: Write the given values of the problem- Volume=800 m3 Temperatue=305 k ∆T=2.90°CHeight=hh=3.10 m

Q: A fish at a pressure of 1.1 atm has its swim bladder inflated to an initial volume of 8.16 mL. If…

A: Given Data: The initial volume of the fish swim bladder is V1=8.16 mL.The initial pressure is P1=1.1…

Q: If a system has 325 kcal of work done to it, and releases 5.00 × 102 kJ of heat into its…

A: Given: Work done, W = 325 kcal = 325 x 4.18 kJ = 1358.5 kJ As there are 4.18 J in one cal. heat…

Q: How much internal energy in Joule is generated when a (1.6100x10^1)-g lead bullet, traveling at…

Q: A refrigeration system uses water-cooled condenser for rejecting the waste heat. The system absorbs…

A: It is given that,

Q: A coal- burning steam locomotive heats steam to 180°C and exhausts it at 100°C. During 1 s of its…

A: Refer Table “Heat engine efficiencies. Typical input and exhaust temperatures, ideal (best possible)…

Q: A system gains 2990 J of heat at a constant pressure of 1.23 × 105 Pa, and its internal energy…

Q: In a game of football outdoors on a cold day, a player will begin to feel exhausted after using…

A: Available Internal Energy = U = 8.0 x 105J

Q: How much internal energy in Joule is generated when a (1.67x10^1)-g lead bullet, traveling at…

A: Mass of bullet "m " = 1.67×10^¹ g Velocity of bullet "v"= 4.9×10^² m/ s .

Q: The maximum amount of water an adult in temperate climates can perspire in one hour is typically 1.8…

Q: A system undergoes a two-step process. In the first step, the internal energy of the system…

Q: A closed system consisting of a hot air balloon expands by 5 x 10^2 L at a constant temperature with…

A: From first law of thermodynamics ΔU=Q−WFor constant temperature process, Change in internal energy…

Q: A saucepan containing 5.00 kg of water initially at 20.0°C is heated over a gas burner for 10.0 min.…

A: Given data m=5 kgT1=20°CT2=30°C

Q: Suppose 2.0 mol of an ideal gas is taken from a volume of 3.5 m to a volume of 1.7 m3 via an…

Q: An ideal gas undergoes a process in which its internal energy decreases by 500 J. Over the same time…

A: Given:decreases in internal energy, dU = - 500 Jwork done on the system , dW = - 220 JFind energy…

Q: A 1.00-kg block of aluminum is warmed at atmospheric pressure so that its temperature increases from…

Q: An ideal heat pump does 400 J of work to keep the temperature in a dorm room at 20◦ C by dumping…

Q: A rigid container that measures 3 ft3 is divided into two equal portions and separated by a thin…

A: The rigid container is divided into two equal portions.

Q: If the plant operates at 50.0% of its maximum efficiency and its power output is 1.23 × 108 W, at…

A: The given data are: TH=540 KTL=313 KQH=1.23×108 W Here, TH is the higher temperature, TL is the…

Q: f a gaseous system is compressed by its surroundings and has 35 J of work done on it, what kind of…

Q: A 53-kg mountain climber, starting from rest, climbs a vertical distance of 764 m. At the top, she…

Q: You are boiling water in a pot on the stove for your tea. Being the brilliant scientist you are, you…

A: Given. The 0.1 kg of water in a pot is boiling at 100 degrees celsius. In the process of boiling the…

Q: A system gains 3080 J of heat at a constant pressure of 1.28 × 105 Pa, and its internal energy…

Q: A lab rat lifts a 200 g mass 1.55 m high as it spins on a Ferris wheel. At the same time, it loses…

Q: Problem 12: A system does 1.9 × 108 J of work while 5.5 x 108 J of heat is transferred from the…

A: Given : Work done (W) = 1.9 x 108 Joule Heat transferred (Q) = - 5.5 x 108 Joule ..... (Negative…

Q: A system gains 3310 J of heat at a constant pressure of 1.38 × 105 Pa, and its internal energy…

A: Write the given values with suitable variables.

Q: Imagine a physics lecture hall with 83 students who are settling in for a 1-hour lecture. At the…

A: Given:Number of students: N=83Total time of lecture: t=1 hour=3600 sInitial temperature of the room:…

Concept explainers

Calorimetry

Measuring the heat transferred during chemical reactions or other physical processes is known as calorimetry. It comes under the branch of thermochemistry.

Question

100%

By jogging, a girl is converting food energy into internal energy at the rate of 399 kcal/h above her basal metabolic rate (BMR). Some of this additional internal energy immediately goes into work done at a rate of 56.1 W. The rest of this additional energy would go into raising her temperature, but it is
instead eliminated by evaporation of perspiration to keep her body temperature constant. Assume that the heat of evaporation of water at body temperature is equal to its heat of vaporization at 100°C.
(a) Determine the hourly rate (in kg/h) at which water must evaporate from her skin.
kg/h
(b) When fat is metabolized, hydrogen atoms in fat molecules are transferred to oxygen to form water. Assume that the metabolism of 1.00 g of fat generates 9.00 kcal of energy and produces 1.00 g of water. What percent of the water needed is generated by burning fat?

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1: Given:

VIEW

Step 2: part (b):

VIEW

Solution

VIEW

Step by step

Solved in 3 steps with 12 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.

Similar questions

8. (a) Let 2.0 kg of liquid water at 100 °C be converted to steam at 100 °C by boiling at standard atmospheric pressure (which is 1.01 × 10° Pa). The volume of that water changes from an initial value of 1.00 x 10 m as a liquid to 1.80 m as steam. Calculate the change in the system's internal energy during the process. [Lv = 2256 kJ/kgl %3D
In a game of football outdoors on a cold day, a player will begin to feel exhausted after using approximately 8.0 x 10 J of internal energy. (a) One player, dressed too lightly for the weather, has to leave the game after losing 7.0 x 10° Jof heat. How much work has he done? (b) Another player, wearing clothes that offer better protection against heat loss, is able to remain in the game long enough to do 2.3x 105 J of work. What is the magnitude of the heat that he has lost? (a) Number Units (b) Number Units <.
A system undergoes a two-step process. In the first step, the internal energy of the system increases by 230 J when 166 J of work is done on the system. In the second step, the internal energy of the system increases by 115 J when 191 J of work is done on the system. For the overall process, find the heat added to the system (including sign).
A Carnot heat engine uses a hot reservoir consisting of a large amount of boiling water and a cold reservoir consisting of a large tub of ice and water. In 5 minutes of operation of the engine, the heat rejected by the engine melts a mass of ice equal to 3.25×10−2 kg. Throughout this problem use Lf=3.34×105J/kg for the heat of fusion for water. During this time, how much work W is performed by the engine?
A gas at 0.75 atm with a volume of 21.7 L undergoes a quasi-static isobaric expansion. If during this process the gas does 457 J of work and its internal energy increases by 73 J, how much heat does the gas absorb?
When 1.00 g of water at 100 °C changes from the liquid to the gas phase at atmospheric pressure, its change in volume is 1.67 × 10−3 m3 . (a) How much heat must be added to vaporize the water? (b) How much work is done by the water against the atmosphere in its expansion? (c) What is the change in the internal energy of the water?
A rigid tank contains a hot fluid that is cooled while being stirred by a paddle wheel. Initially, the internal energy of the fluid is 800 kJ. During the cooling process, the fluid loses 500 kJ of heat, and the paddle wheel does 100 kJ of work on the fluid. Determine the final internal energy of the fluid. Neglect the energy stored in the paddle wheel.
A storage building with well-insulated walls and containing 750 m³ of air at 275 K is heated at constant pressure (atmospheric). Consider air to be an ideal diatomic gas. (a) Determine the energy (in kJ) required to increase the temperature of the air in the building by 2.30°C. kJ (b) Determine the mass (in kg) this amount of energy could lift through a height 2.30 m. kg
You wish to chill 12 cans of soda at 25.0 °C down to 5.0 °C beforeserving them to guests. Each can has a mass of 0.354 kg, and thespecific heat of soda is the same as that of water. (a) How muchthermal energy must be removed in order to chill all 12 cans?(b) If the chilling process requires 4.0 h, what is the average rate(in W) at which thermal energy is removed from the soda?
A sample of a monoatomic ideal gas has a pressure of p and volume V. When the gas is warmed, it’s pressure triples and volume triples. This warming process includes two steps, the first at constant pressure and the second at constant volume. Determine the amount of energy transferred to the gas by heat.
A car tire contains 0.0380 m3 of air at a pressure of 2.20 × 105 Pa (about 32 psi). How much more internal energy does this gas have than the same volume has at zero gauge pressure (which is equivalent to normal atmospheric pressure)?
Question 4. A 5.0 kg block of aluminium is heated from 20°C to 90°C at atmospheric pressure. Find (a) the work done by the aluminium, (b) the amount of energy transferred to it by heat, and (c) the increase in internal energy.