![University Physics Volume 2](https://www.bartleby.com/isbn_cover_images/9781938168161/9781938168161_largeCoverImage.gif)
Concept explainers
You leave a pastry in the refrigerator on a plate and ask your roommate to take it out before you get home so you can eat it at room temperature, the way you like it Instead, your roommate plays video games for hours. When you return, you notice that the pastry is still cold, but the game console has become hot. Annoyed, and knowing that the pastry w-ill not be good if it is microwaved, you warm up the pastry by unplugging the console and putting it in a clean trash bag (which acts as a perfect calorimeter) with the pastry on the plate. After a while, you find that the equilibrium temperature is a nice, warm 38.3 ℃. You know that the game console has a mass of 2.1 kg. Approximate it as having a uniform initial temperature of 45 ℃. The pastry has amass of 0.16 kg and a specific heat of 3.0 k J/(kg . ℃), and is at a uniform initial temperature of 4.0 ℃. The plate is at the same temperature and has a mass of 0.24 kg and a specific heat of 0.90 J/(kg . ℃). What is the specific heat of the console?
![Check Mark](/static/check-mark.png)
Trending nowThis is a popular solution!
![Blurred answer](/static/blurred-answer.jpg)
Chapter 1 Solutions
University Physics Volume 2
Additional Science Textbook Solutions
Conceptual Physical Science (6th Edition)
College Physics: A Strategic Approach (3rd Edition)
Introduction to Electrodynamics
Lecture- Tutorials for Introductory Astronomy
University Physics with Modern Physics (14th Edition)
Essential University Physics (3rd Edition)
- (a) What is the rate of heat conduction through the 3.00-cm-thick fur of a large animal having a I .40-m surface area? Assume that the animal's skin temperature is 32.0 , that the air temperature is 5.00 , and that has the same thermal conductivity as air. (b) What food intake will the animal need in one day to replace this heat transfer?arrow_forwardDuring a bout with the flu an 80-kg person ran a fever of 39 oC. Consider that the specific heat of any human body is 3470 J/kg K, how much energy does the body need to burn to reach the fever temperature?arrow_forwardAn incandescent lamp filament has area 40 mm and operates at a temperature of 1127°C.Assume that all the energy furnished to the bulb is radiated from it. If the filament's emissivityis 0.83, how much power must be furnished to the bulb when it is operatingarrow_forward
- The heat capacity of air at room temperature and pressure is approximately 21 J×mol-1×K-1. a) How much energy is required to raise the temperature of a room dimensions 5.5 m x 6.5 m x 3.0 m by 10°C from room temperature (298.15 K) assuming ideal behavior? b) How long will it take a heater rated at 1.5 kW to achieve that increase if 1 W = 1 J×s-1 (assuming no loss)?arrow_forwardWhen energy shortages occur, magazine articles sometimes urge us to keep our homes at a constant temperature day and night to conserve fuel. They argue that when we turn down the heat at night, the walls, ceilings, and other areas cool off and must be reheated in the morning. So if we keep the temperature constant, these parts of the house will not cool off and will not have to be reheated. Does this argument make sense? Would we really save energy by following this advice?arrow_forwardThe inside of an oven is at a temperature of 200C 1392F2. Youcan put your hand in the oven without injury as long as you don’t touchanything. But since the air inside the oven is also at 200C, why isn’tyour hand burned just the same?arrow_forward
- An incandescent lightbulb is an inexpensive but highly inefficient device that converts electrical energy into light. It converts about 10 percent of the electrical energy it consumes into light while converting the remaining 90 percent into heat. (A fluorescent lightbulb will give the same amount of light while consuming only one-fourth of the electrical energy, and it will last 10 times longer than an incandescent lightbulb.) The glass bulb of the lamp heats up very quickly as a result of absorbing all that heat and dissipating it to the surroundings by convection and radiation. Consider a 10-cm-diameter 100-W lightbulb cooled by a fan that blows air at 30°C to the bulb at a velocity of 2 m/s. The surrounding surfaces are also at 30°C, and the emissivity of the glass is 0.9. Assuming 10 percent of the energy passes through the glass bulb as light with negligible absorption and the rest of the energy is absorbed and dissipated by the bulb itself, determine the equilibrium temperature…arrow_forward5 kg of fish (Cp =3600 J/KgK) is placed in a storage box that has A=0,45 m2 and k=0,025 W/mK. The storage box wall is 2 cm. The fish temperature within the box is -1°C when it is packed. a) how much heat goes through the storage box wall if it is forgotten outsite in 20°C b)How long time does it take the fish to get to the same temperature as the surronding.arrow_forwardEstimate how long (in seconds) it should take to bring a cup of water to boiling temperature in a typical 700-watt microwave oven, assuming that all the energy ends up in the water. Something to think about: why is no heat involved in this process? The heat capacity of water is 75.29J/K/mol. A cup of water is about 250mL. Assume the water is at 25°C to start with (typical room temperature). Relative tolerance +/- 2% Sarrow_forward
- The giant hornet Vespa mandarinia japonica preys on Japanese bees. However, if one of the hornets attempts to invade a beehive, several hundred of the bees quickly form a compact ball around the hornet to stop it. They don’t sting, bite, crush, or suffocate it. Rather they overheat it by quickly raising their body temperatures from the normal 35 C to 47 C or 48 C, which is lethal to the hornet but not to the bees . Assume the following: 500 bees form a ball of radius R=2.0 cm for a time t= 20 min, the primary loss of energy by the ball is by thermal radiation, the ball’s surface has emissivity ´=0.80, and the ball has a uniform temperature. On average, how much additional energy must each bee produce during the 20 min to maintain 47 C?arrow_forwardElectronics and inhabitants of the International Space Station generate a significant amount of thermal energy that the station must get rid of. The only way that the station can exhaust thermal energy is by radiation, which it does using thin, 1.7 m -by-3.8 m panels that have a working temperature of about 6° C. How much power is radiated from each panel? Assume that the panels are in the shade so that the absorbed radiation will be negligible. Assume that the emissivity of the panels is 1.0. Express your answer with the appropriate units. ► View Available Hint(s) P = μA Value Units ?arrow_forwardBefore going in for an annual physical, a 70.0-kgkgperson whose body temperature is 37.0∘C Consumes an entire 0.355-literliter can of a soft drink (which is mostly water) at 12.0∘C What will be the person's body temperature TfinalTfinal after equilibrium is attained? Ignore any heating by the person's metabolism. The specific heat capacity of a human body is 3480 J/kg⋅KJ/kg⋅K. Is the change in the person's body temperature great enough to be measured by a medical thermometer? (A high-quality medical thermometer can measure temperature changes as small as 0.1∘C∘C or less.)arrow_forward
- Physics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
- College PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningCollege PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning
![Text book image](https://www.bartleby.com/isbn_cover_images/9781305116399/9781305116399_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781133104261/9781133104261_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781133939146/9781133939146_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781285737027/9781285737027_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781938168161/9781938168161_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781305952300/9781305952300_smallCoverImage.gif)