Physics for Scientists and Engineers
10th Edition
ISBN: 9781337553278
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Textbook Question
Chapter 19, Problem 25P
Two lightbulbs have cylindrical filaments much greater in length than in diameter. The evacuated bulbs are identical except that one operates at a filament temperature of 2 100°C and the other operates at 2 000°C. (a) Find the ratio of the power emitted by the hotter lightbulb to that emitted by the cooler lightbulb. (b) With the bulbs operating at the same respective temperatures, the cooler lightbulb is to be altered by making its filament thicker so that it emits the same power as the hotter one. By what factor should the radius of this filament be increased?
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
Assume that the efficiency of the portable solar panel shown in the figure is 19%.(a)(a)What is the amount of solar radiation required to provide rated output power?(b)(b)The camper connects the panel to a hot water heater in a 1L water container in sunlight according to (a). How long does it take to raise the temperature of this water from 1 degree Celsius to 100 degrees Celsius? Suppose there is no heat loss.
To heat a room with dimensions width a=3 m, length b=5 m, height h=2,2 m, approximately an electrical power of P=10 W per square meter is needed. At a cost of 0.2 soles per kW.h, how much will it cost per day to use this heater?
A cylindrical resistor element on a circuit board dissipates 0.15 W of power in an environment
at 40°C. The resistor is 1.2 cm long, and has a diameter of 0.3 cm. Assuming heat to be
transferred uniformly from all surfaces, determine the amount of heat this resistor dissipates
during a 24 h period;
Chapter 19 Solutions
Physics for Scientists and Engineers
Ch. 19.2 - Prob. 19.1QQCh. 19.3 - Suppose the same process of adding energy to the...Ch. 19.5 - Prob. 19.3QQCh. 19.5 - Characterize the paths in Figure 19.12 as...Ch. 19.6 - Prob. 19.5QQCh. 19 - Prob. 1PCh. 19 - The highest waterfall in the world is the Salto...Ch. 19 - Prob. 3PCh. 19 - The temperature of a silver bar rises by 10.0C...Ch. 19 - You are working in your kitchen preparing lunch...
Ch. 19 - If water with a mass mk at temperature Tk is...Ch. 19 - An aluminum calorimeter with a mass of 100 g...Ch. 19 - An electric drill with a steel drill bit of mass m...Ch. 19 - A 3.00-g copper coin at 25.0C drops 50.0 m to the...Ch. 19 - How much energy is required to change a 40.0-g ice...Ch. 19 - Prob. 11PCh. 19 - A 3.00-g lead bullet at 30.0C is fired at a speed...Ch. 19 - In an insulated vessel, 250 g of ice at 0C is...Ch. 19 - Prob. 14PCh. 19 - One mole of an ideal gas is warmed slowly so that...Ch. 19 - (a) Determine the work done on a gas that expands...Ch. 19 - A thermodynamic system undergoes a process in...Ch. 19 - Why is the following situation impossible? An...Ch. 19 - A 2.00-mol sample of helium gas initially at 300...Ch. 19 - (a) How much work is done on the steam when 1.00...Ch. 19 - A 1.00-kg block of aluminum is warmed at...Ch. 19 - In Figure P19.22, the change in internal energy of...Ch. 19 - A student is trying to decide what to wear. His...Ch. 19 - A concrete slab is 12.0 cm thick and has an area...Ch. 19 - Two lightbulbs have cylindrical filaments much...Ch. 19 - Prob. 26PCh. 19 - (a) Calculate the R-value of a thermal window made...Ch. 19 - Prob. 28PCh. 19 - Gas in a container is at a pressure of 1.50 atm...Ch. 19 - Prob. 30APCh. 19 - You have a particular interest in automobile...Ch. 19 - You are working in a condensed-matter laboratory...Ch. 19 - Prob. 33APCh. 19 - Prob. 34APCh. 19 - Prob. 35APCh. 19 - Prob. 36APCh. 19 - An ice-cube tray is filled with 75.0 g of water....Ch. 19 - Prob. 38APCh. 19 - An iron plate is held against an iron wheel so...Ch. 19 - One mole of an ideal gas is contained in a...Ch. 19 - Prob. 41APCh. 19 - Prob. 42APCh. 19 - Prob. 43APCh. 19 - A student measures the following data in a...Ch. 19 - (a) The inside of a hollow cylinder is maintained...Ch. 19 - A spherical shell has inner radius 3.00 cm and...Ch. 19 - Prob. 47CP
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
- An 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(a) How much energy is necessary to heat 7.0 kg of water from room temperature (20°C) to its boiling point? (Assume no energy loss.)(b) If electrical energy were used, how much would this cost at 19¢ per kWh?arrow_forwardAn infrared heater for a sauna has a surface area of 0.050 m2 and an emissivity of 0.84. What temperature must it run at if the required power is 360 W? Neglect the temperature of the environment.arrow_forward
- Diameter of a Solid conductor wire is 2.54 cm and the thickness of the insulation is 3 mm. When the current is flowing, the rate of heat dissipation from the wire is 417 W per unit length of wire. If the outer surface temperature of the insulation is 28 °C, Calculate the inner surface temperature of the insulation. Take the thermal conductivity of the insulation material as 0.44 W/m K.arrow_forwardA bulb delivers 25 W of radiant energy when its filament is at 1500 °C . If the temperature increases by 300 °C , what is the new rate of energy radiated by this bulb?arrow_forwardA long length of copper wire is initially at room temperature (23∘C) when it is connected across the terminals of an ideal potential source of V0=10V. The power dissipated by the wire as heat is initially measured to be Pinitial = 50W. The wire begins to heat up, but eventually reaches a "steady state" temperature (i.e., the wire is now warmer than the original room temperature, but it is no longer getting any hotter.) At this point, the power dissipated by the same circuit is Pfinal = 44.3 W. Calculate the final temperature of the copper wire. (You can find the temperature coefficient of resistivity for copper from the table in the text above.)arrow_forward
- What is the role of “loose” electrons in heat conductors? (A) Loose electrons move quickly away from hot locations, making it impossible for energy to move and making the object a good insulator. (B) Loose electrons absorb energy, giving materials a high specific heat capacity. (C) Loose electrons vibrate and emit radiation that carries energy through the material at the speed of light. (D) Loose electrons transfer energy rapidly through a solid.arrow_forwardIn the comparison of heat and electrical energy flowing along a well insulated conductor which of these is/are true? 1) The Pd across the ends of the conductor is analogous to the temperature difference 44. between the ends of the conductor. 2) The electric current is analogous to the rate of flow of heat 3) The electrical resistance is analogous to the of thermal conductivityarrow_forwardA fluorescent tube has a power rating of 52 W. It is also left on for 3 hours, and 92 170 J of energy was used to produce radiant energy. What is the efficiency of the fluorescent tube?arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPhysics 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 Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning
Physics for Scientists and Engineers, Technology ...
Physics
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Heat Transfer: Crash Course Engineering #14; Author: CrashCourse;https://www.youtube.com/watch?v=YK7G6l_K6sA;License: Standard YouTube License, CC-BY