Essential University Physics
4th Edition
ISBN: 9780134988559
Author: Wolfson, Richard
Publisher: Pearson Education,
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Chapter 17, Problem 52P
To determine
The amount of energy lost to sweating during a
3 hour
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Chapter 17 Solutions
Essential University Physics
Ch. 17.1 - If you double the kelvin temperature of a gas,...Ch. 17.2 - You bring a pot of water to boil and then forget...Ch. 17.3 - The figure shows a donut-shaped object. If its...Ch. 17 - Prob. 1FTDCh. 17 - Why are you supposed to check tire pressure when...Ch. 17 - The average speed of the molecules in a gas...Ch. 17 - Suppose you start running while holding a closed...Ch. 17 - Prob. 5FTDCh. 17 - Whats the temperature of water just under the ice...Ch. 17 - Ice and water have been together in a glass for a...
Ch. 17 - Which takes more heat: melting a gram of ice...Ch. 17 - The triple point of water defines a precise...Ch. 17 - A bimetallic strip consists of thin pieces of...Ch. 17 - Marss atmospheric pressure is about 1% that of...Ch. 17 - Prob. 12ECh. 17 - Whats the pressure of an ideal gas if 3.5 mol...Ch. 17 - Prob. 14ECh. 17 - (a) If 2.0 mol of an ideal gas are initially at...Ch. 17 - A pressure of 1010 Pa is readily achievable with...Ch. 17 - In which gas are the molecules moving faster:...Ch. 17 - How much energy does it take to melt a 65-g ice...Ch. 17 - It takes 200 J to melt an 8.0-g sample of one of...Ch. 17 - If it takes 840 kJ to vaporize a sample of liquid...Ch. 17 - Carbon dioxide sublimes (changes from solid to...Ch. 17 - Prob. 22ECh. 17 - You have exactly 1 L of ethyl alcohol at room...Ch. 17 - A Pyrex glass marble is 1.00000 cm in diameter at...Ch. 17 - At 0C, the hole in a steel washer is 9.52 mm in...Ch. 17 - Suppose a single piece of welded steel railroad...Ch. 17 - Example 17.1: Typical atmospheric pressure at the...Ch. 17 - Prob. 28ECh. 17 - Prob. 29ECh. 17 - Prob. 30ECh. 17 - Example 17.4: Repeal the calculation of Example...Ch. 17 - When 200 g of ice at –10°C are added to 1.0 kg of...Ch. 17 - Example 17.4: A mountain glacier ends in a small...Ch. 17 - Prob. 34ECh. 17 - Prob. 35PCh. 17 - Prob. 36PCh. 17 - A compressed air cylinder stands 100 cm tall and...Ch. 17 - Youre a lawyer with an unusual case. A...Ch. 17 - A 3000-mL flask is initially open in a room...Ch. 17 - The recommended treatment for frostbite is rapid...Ch. 17 - A stove burner supplies heat to a pan at the rate...Ch. 17 - If a 1-megaton nuclear bomb were exploded deep in...Ch. 17 - Prob. 43PCh. 17 - Prob. 44PCh. 17 - A refrigerator extracts energy from its contents...Ch. 17 - Climatologists have recently recognized that black...Ch. 17 - How much energy does it take to melt 10 kg of ice...Ch. 17 - Water is brought to its boiling point and then...Ch. 17 - Prob. 49PCh. 17 - A bowl contains 16 kg of punch (essentially water)...Ch. 17 - A 50-g ice cube at 10C is placed in an equal mass...Ch. 17 - Prob. 52PCh. 17 - What power is needed to melt 20 kg of ice in 6.0...Ch. 17 - You put 300 g of water at 20C into a 500-W...Ch. 17 - Prob. 55PCh. 17 - Describe the composition and temperature of the...Ch. 17 - A glass marble 1.000 cm in diameter is to be...Ch. 17 - Prob. 58PCh. 17 - A steel ball bearing is encased in a Pyrex glass...Ch. 17 - Fuel systems of modern cars are designed so...Ch. 17 - A rod of length L0 is clamped rigidly at both...Ch. 17 - Prob. 62PCh. 17 - A solar-heated house stores energy in 5.0 tons of...Ch. 17 - Show that the coefficient of volume expansion of...Ch. 17 - Waters coefficient of volume expansion in the...Ch. 17 - When the expansion coefficient varies with...Ch. 17 - A 50-mL graduated cylinder is made from Pyrex...Ch. 17 - The timekeeping of a grandfather clock is...Ch. 17 - Prob. 69PCh. 17 - Prob. 70PCh. 17 - Figure 17.12 shows an apparatus used to determine...Ch. 17 - Prob. 72PCh. 17 - (a) Show that, for an ideal gas, the speed of...Ch. 17 - The Maxwell-Boltzmann distribution, plotted in...Ch. 17 - At high gas densities, the van der Waals equation...Ch. 17 - Prob. 76PPCh. 17 - Prob. 77PPCh. 17 - Because some pathogens can survive 120C...Ch. 17 - Prob. 79PP
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- While hanging out in Lab, you decide to conduct another calorimetry experiment, but this time, you want to do it on a bit larger scale. You place 3.8 kg of water in a large aluminum can that has a mass of 15 kg. You heat the water and can up to an initial temperature of 80◦ C, and then slowly add 400 g of ice that has an initial temperature of −10◦ C. You stir the ice and water until all of the ice melts, and the system comes to an equilibrium temperature of 32◦ C. You feel good about things until you realize that you did not cover the aluminum can and that some heat was lost to the environment during the experiment. Use the information provided to calculate the amount of heat that was lost to the environment.arrow_forwardMany species cool themselves by sweating, because as the sweat evaporates, heat is transferred to the surroundings. A human exercising strenuously has an evaporative heat loss rate of about 659 W. If a person exercises strenuously for 21.9 min, how much water must he drink to replenish his fluid loss? The heat of vaporization of water is 2430 J/g at normal skin temperature.arrow_forwardI am very hungry, so I need to cook myself some ramen on the stove. I fill up a pot with 2 kg of water and place the pot on my stove which has an average power output of 8.22 kW, raising the water's temperature from 31.5°C to its boiling point (roughly around 100.6°C). How long after placing the pot of water on the stove does it take for the pot of water start boiling in seconds? Hint: Water has a specific heat of 4.2 k J k g ∘ C, and this is an energy transformation problem. Start with finding Q.arrow_forward
- A styrofoam container used as a picnic cooler contains a block of ice at 0°C. If 564 g of ice melts in 1 hour, how much heat energy per second is passing through the walls of the container? The heat of fusion of ice is 3.33 x 10° J/kg. Answer in units of W.arrow_forwardWhen air is inhaled, it quickly becomes saturated with water vapor as it passes through the moist upper airways. When a person breathes dry air, about 25 mg of water are exhaled with each breath. At 12 breaths/min, what is the rate of energy loss due to evaporation? Express your answer in both watts and Calories per day. At body temperature, the heat of vaporization ofwater is Lv = 24 × 105 J/kg.arrow_forwardYou read in a popular diet blog that the author claims you can lose up to half a pound of body fat per week if, instead of drinking 1.9 liters (i.e., 1.9 kilograms) of water every day, you can eat the same amount of water in the form of ice. The reasoning is that your body must first melt the ice and then bring the ice water up to the body temperature of 37°C, which is a process that requires a significant amount of energy at the expense of “burned” body fat. Thankfully, you just finished discussing heat and phase changes in your physics class, so you can calculate exactly how much energy is expended. The specific heat and latent heat of fusion for water are 4.186 × 103 J/(kg⋅°C) and 3.34×105 J/kg, respectively a) How many kilocalories do you expend when you eat 1.9 kg of ice at 0°C? Note that 1 kcal = 4186 J. b) Assuming the metabolism of one pound of body fat produces 3500 kcal of energy, how many pounds of body fat could you lose in a week just by eating 1.9 kilograms of ice every…arrow_forward
- Normal body temperature for humans is 98.6 °F. What is the corresponding temperature in (a) degrees Celsius and (b) kelvins?arrow_forwardWhile swimming, conduction can play a big role in heat loss from the body. The body of one swimmer has a total surface area of 1.80 m2 and an average thickness of 1.60 mm. The skin's thermal conductivity is 0.370 W/m-K. If the water's temperature is 20.0°C, and the blood reaching the inner surface of the skin is at 37.0°C, what is the rate of energy loss for that person through conduction?arrow_forwardOne strategy when on a diet is to drink ice water. The body must burn calories to warm the water from 0°C to a body temperature of 37°C. Assume a dieter drinks 2.3 kg (i.e., 2.3 L) of ice water every day. The specific heat of water is 4.186 × 103 J/(kg⋅°C). Part (a) How much energy, in joules, does the dieter’s body need to provide in order to warm the water over a full year. Take 365 days in a year. Part (b) One pound of fat supplies 3500 kcal (Cal) to the body, where 1 kcal (Cal) = 4.186 × 103 J. How much fat, in pounds, can the dieter hope to lose in a year by drinking ice water rather than water at body temperature?arrow_forward
- In an insulated container, you combine hot metal with ice. The ice starts at -20 degree C. The copper starts at 900 degree C. When 15 kg of the copper is combined with an unknown amount of ice, the system reaches equilibrium as soon as all of the ice has boiled to become steam. What is the final temperature of the copper?arrow_forwardThe air temperature above coastal areas is profoundly influenced by the large specific heat of water. One reason is that the energy released when 1 cubic meter of water cools by 1.0°C will raise the temperature of an enormously larger volume of air by 1.0°C. Estimate that volume of air. The specific heat of air is approximately 1.0 kJ/kg ? °C. Take the density of air to be 1.3 kg/m3.arrow_forwardOverall, 80% of the energy used by the body must be eliminated as excess thermal energy and needs to be dissipated. The mechanisms of elimination are radiation, evaporation of sweat (2,430 kJ/kg), evaporation from the lungs (38 kJ/h), conduction, and convection. A person working out in a gym has a metabolic rate of 2,500 kJ/h. His body temperature is 37°C, and the outside temperature 22°C. Assume the skin has an area of 2.0 m2 and emissivity of 0.97. (o = 5.6696 × 10-8 w/m2 · K4) (a) At what rate is his excess thermal energy dissipated by radiation? (Enter your answer to at least one decimal place.) 1.8e2 W (b) If he eliminates 0.44 kg of perspiration during that hour, at what rate is thermal energy dissipated by evaporation of sweat? (Enter your answer to at least one decimal place.) 3.0e2 W (c) At what rate is energy eliminated by evaporation from the lungs? (Enter your answer to at least one decimal place.) 10.6 W (d) At what rate must the remaining excess energy be eliminated…arrow_forward
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