1. A man consumes 3200 kcal of food in one day, converting most of it to thermal energy to maintainbody temperature. If he loses half of this energy by evaporating water (through breathing andsweating), how many kilograms of water evaporate? (the latent heat of water is 539 kcal/kg)kg

Given: Energy consumed = 3200 kcal Energy lost through evaporation = 1600 kcal Latent heat of water…

Answered: A man consumes 3200 kcal of food in one…

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)...

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2.2 kg of ice (solid phase of water) at -10°C is heated under atmospheric pressure. Answer the following questions. Use the following values for your calculation. specific heat of ice: 2.1 kJ/(kg °C) specific heat of water: 4.2 kJ/(kg °C) specific heat of vapor: 2.0 kJ/(kg °C) latent heat of fusion: 334 kJ/kg latent heat of vaporization: 2260 kJ/kg How much heat is required to raise the temperature of the ice to melting point T = 0°C? How much heat is required to change the phase of the ice to liquid water? How much heat is required to raise the temperature of the liquid water to boiling point T = 100°C?
The basal metabolic rate is the rate at which energy is produced in the body when a person is at rest. A 75 kg (165 lb) person of height 1.75 m (5.7 ft) would have a body surface area of approximately 1.90 m2. What is the net amount of heat this person could radiate per second into a room at 19.0 °C (about 66.2 °F) if his skin's surface temperature is 30.0 °C? (At such temperatures, nearly all the heat is infrared radiation, for which the body's emissivity is 1.0, regardless of the amount of pigment.)
When you turn your hot water on in the shower, it takes a bit for the water to get warm. Some of this is because the water in the pipe is cold but some of it is because the water from the hot water heater must heat the copper plumbing pipe itself. Copper has a specific heat of 0.39R. How much energy does it take to heat 2 kilograms of copper pipe from 70°F to 130°F? Report your answer in Joules. (Hint: Note that you'll need to convert kJ to J and F to K.)
One 500mL glass of coke is 10°C when 0°C ice is added to the glass. After enough time, all the ice has melted and the liquid in the glass is now 8°C. How heavy was the ice? (l = water = 333 · 103 J/kg, specific heat for coke ≈ water = 4186 J/kgK) My answer is 11,4 grams but the book says 124 g?
Suppose that 0.1 kg of ice at an initial temperature of -10°C are put into 0.40kg of water at an initial temperature of 20°C. Assume the final temperature is 0°C. How many grams of ice will melt? Specific heat capacity of water is 4,200J/kg/°C. Specific heat of fusion of water is 336,000 J/kg and specific heat capacity of ice is 2,100 J/kg/°C.
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In a cold country, an apartment needs 48 kWh of heat to maintain their internal temperature at 27° C. They use parabolic trough to collect the heat from sun and store the hot water in a storage tank whose temperature is at 75° C. What is the capacity of storage tank if specific heat of water is 4182 J/kg C?
A hot steel plate with a surface area of 2.17 m2 and a constant surface temperature of 165°C is exposed to ambient air at 24°C. If the convection heat transfer coefficient is 15.4 W/m2· K, what is the rate of heat transfer (in W) from the plate to the air [round your final answer to zero decimal places]?
In an insulated vessel, 239 g of ice at 0°C is added to 635 g of water at 15.0°C. (Assume the latent heat of fusion of the water is 3.33 x 10° J/kg and the specific heat is 4,186 J/kg · °C.) (a) What is the final temperature of the system? °C (b) How much ice remains when the system reaches equilibrium?
On a sunny day when the outside temperature is 34.0°C, a car parked in the sun is receiving 812 watts/m2 of incoming solar radiation (Insolation). Because the car radiates heat off of a greater surface area, the car in-turn radiates off heat at a rate of 169 watts/m². If the car is considered a perfect absorber and emitter of radiative energy, what will the equilibrium temperature inside the car be? °C
2.2 kg of ice (solid phase of water) at -10°C is heated under atmospheric pressure. Answer the following questions. Use the following values for your calculation. specific heat of ice: 2.1 kJ/(kg °C) specific heat of water: 4.2 kJ/(kg °C) specific heat of vapor: 2.0 kJ/(kg °C) latent heat of fusion: 334 kJ/kg latent heat of vaporization: 2260 kJ/kg How much heat is required to change the phase of the liquid water to vapor? How much heat is required to raise the temperature of vapor to 200°C?

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A man consumes 3200 kcal of food in one day, converting most of it to thermal energy to maintain body temperature. If he loses half of this energy by evaporating water (through breathing and sweating), how many kilograms of water evaporate? (the latent heat of water is 539 kcal/kg)