In an electrically heated home, the temperature of the ground in contact with a concrete basement wall is 11.9 °C. The temperature atthe inside surface of the wall is 19.0 °C. The wall is 0.13 m thick and has an area of 7.5 m². Assume that one kilowatt hour of electricalenergy costs $0.10. How many hours are required for one dollar's worth of energy to be conducted through the wall?Number iUnits

Answered: Image /qna-images/answer/c0cc53a7-ce04-49df-9354-24543279c0ce.jpg

Answered: In an electrically heated home, the…

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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em 5 A NATO base in northern Norway is warmed with a heat pump that uses 7.0°C ocean water as the cold reservoir, Heat extracted from the ocean water warms fluid to 80° C; this warmed fluid is used to heat the building When the system is working at full capacity, 2000 kW of heat are delivered to the building at the cost of 600 kW of electric energy. Part A What is the actual coefficient of performance of the system? COP Submit Request Answer Part B What is the theoretical maximum coefficient of performance of the system? COPX Submit Request Answar P Type here to search
1) Determine the change in chemical energy each second required to produce this increase in electric potential energy. 2) If there are roughly 7×10^11 of these cells in the body, how much chemical energy is used in pumping sodium ions each second? 3) Estimate the fraction of a person's metabolic rate used to pump these ions. Assume the metabolic rate to be 100 W.
A typical coal-fired power plant burns 300 metric tons of coal every hour to generate 2.7 × 106 MJ of electric energy. 1 metric ton = 1000 kg; 1 metric ton of coal has a volume of 1.5 m3. The heat of combustion of coal is 28 MJ/kg. Assume that all heat is transferred from the fuel to the boiler and that all the work done in spinning the turbine is transformed into electric energy.a. Suppose the coal is piled up in a 10 m × 10 m room. How tall must the pile be to operate the plant for one day?b. What is the power plant’s efficiency?
Assume that Q₁ = -15.0 J and Q2 = -80.0 J in (Figure 1). For help with math skills, you may want to review: Substituting Numbers into Mathematical Expressions For general problem-solving tips and strategies for this topic, you may want to view a Video Tutor Solution of Heat engine details. Figure p (kPa) 400 200 0 0 [] 2₁ 100 200 < 22 1 of 1 -V (cm³) Part A What is Wout for the heat engine shown in the figure? Express your answer with the appropriate units. Wout= Submit Request Answer Part B Value QH = What is QH for the heat engine shown in the figure? Express your answer with the appropriate units. Units Value Units ? ?
Question 5 Specific Heat of Solid Substances Substance D Aluminum B silver; because it is a transition metal with the lowest specific heat value C Iron Copper Tin Given the specific heat information presented, which substance would make the BEST material to create a pan for cooking and why? D Specific Heat (J/kg°C) 899 443 385 213 Tin - because it has a low specific heat, which means it conducts heat the best. Aluminum - because it has a high specific heat, which means it conducts heat the best. Copper - because it has a mid-level specific heat, which means it is a good insulator. Iron - because it has a mid-level specific heat, which means it is a good conductor.
A small electric immersion heater is used to heat 83 g of water for a cup of instant coffee. The heater is labeled "69 watts" (it converts electrical energy to thermal energy at this rate). Calculate the time required to bring all this water from 19°C to 100°C, ignoring any heat losses. (The specific heat of water is 4186 J/kg-K.) Number i Units
An air-filled cylinder with a movable piston has a heat reservoir in contact with it. The heat reservoir transfers 850 J of energy into the cylinder. Due to the energy transfer, the piston does 437 J of work on the environment. What is the change in internal energy of the system?

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