Physics for Scientists and Engineers with Modern Physics
10th Edition
ISBN: 9781337553292
Author: Raymond A. Serway, John W. Jewett
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Concept explainers
Question
Chapter 19, Problem 28P
(a)
To determine
The mass of waxy material that is required to perform the bacteriological test.
(b)
To determine
The reason for which the calculation can be done without knowing the mass of test sample.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
A person infected with the SARS-CoV-2 virus is running a fever with an internal body temperature of 103 °F (39.4 °C). This raises the
person's skin temperature to 36.5 °C. The person is standing unclothed in a room with an ambient temperature of 21.0 °C. If the
temperature of the person's skin is maintained at 36.5 °C solely by the energy obtained from the metabolic conversion of food, how
many Calories would this person have to consume per hour? Assume heat is lost only by radiation, and the surface area and emissivity
of the person's skin are 1.50 m² and 0.800, respectively.
Number
Units
A person infected with the SARS-CoV-2 virus is running a fever with an internal body temperature of 103 °F (39.4 °C). This raises the
person's skin temperature to 36.5 °C. The person is standing unclothed in a room with an ambient temperature of 21.0 °C. If the
temperature of the person's skin is maintained at 36.5 °C solely by the energy obtained from the metabolic conversion of food, how
many Calories would this person have to consume per hour? Assume heat is lost only by radiation, and the surface area and emissivity
of the person's skin are 1.50 m2 and 0.800, respectively.
00200
Total lung capacity of a typical adult is approximately 5.0 L. Approximately 20% of the air is oxygen. At sea level and at an average body temperature of 37°C, how many moles of oxygen do the lungs contain at the end of an inhalation?
Chapter 19 Solutions
Physics for Scientists and Engineers with Modern Physics
Ch. 19.2 - Prob. 19.1QQCh. 19.3 - Prob. 19.2QQCh. 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 - Prob. 7PCh. 19 - An electric drill with a steel drill bit of mass m...Ch. 19 - Prob. 9PCh. 19 - How much energy is required to change a 40.0-g ice...Ch. 19 - Prob. 11PCh. 19 - Prob. 12PCh. 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 - Prob. 18PCh. 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 - Prob. 23PCh. 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 - Prob. 32APCh. 19 - Prob. 33APCh. 19 - Prob. 34APCh. 19 - Review. Following a collision between a large...Ch. 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 - Prob. 46CPCh. 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
- On a hot summer day, the density of air at atmospheric pressure at 35.0C is 1.1455 kg/m3. a. What is the number of moles contained in 1.00 m3 of an ideal gas at this temperature and pressure? b. Avogadros number of air molecules has a mass of 2.85 102 kg. What is the mass of 1.00 m3 of air? c. Does the value calculated in part (b) agree with the stated density of air at this temperature?arrow_forwardIn the lungs, a thin respiratory membrane separates tiny sacs of air from the blood in the capillaries at atmospheric pressure. These sacs are called alveoli (spherical shape), and it is from them that oxygen enters the blood. The diameter of the alveoli is 0.25 mm, and the air inside contains 14% oxygen. If the air behaves as an ideal gas at body temperature of 37 °C, find the number of oxygen molecules in one of the sacs?arrow_forwardDuring a plant visit, it was noticed that a 12-m-long section of a 10-cm-diameter steam pipe is completely exposed to the ambient air. The temperature measurements indicate that the average temperature of the outer surface of the steam pipe is 75°C when the ambient temperature is 5°C. There are also light winds in the area at 10 km/h. The emissivity of the outer surface of the pipe is 0.8, and the average temperature of the surfaces surrounding the pipe, including the sky, is estimated to be 0°C. Determine the amount of heat lost from the steam during a 10-h-long work day. Steam is supplied by a gas-fired steam generator that has an efficiency of 80 percent, and the plant pays $1.05/therm of natural gas. If the pipe is insulated and 90 percent of the heat loss is saved, determine the amount of money this facility will save a year as a result of insulating the steam pipes. Assume the plant operates every day of the year for 10 h. State your assumptions.arrow_forward
- A walrus transfers energy by conduction through its blubber at the rate of 150 W when immersed in −1.00 °C water. The walrus’s internal core temperature is 37.0 °C , and it has a surface area of 2.00 m2 . What is the average thickness of its blubber, which has the conductivity of fatty tissues without blood?arrow_forwardApproximately how long should it take 8.8 kg of ice at 0°C to melt when it is placed in a carefully sealed Styrofoam ice chest of dimensions 25 cm x 35 cm x 55 cm whose walls are 1.4 cm thick? Assume that the conductivity of Styrofoam is double that of air and that the outside temperature is 34 °C. Express your answer to two significant figures and include the appropriate units. t = μА Value Units ?arrow_forwardWhen you drink cold water, your body must expend metabolic energy in order to maintain normal body temperature (37° C) by warming up the water in your stomach. Could drinking ice water, then, substitute for exercise as a way to "burn calories?" Suppose you expend 422 kilocalories during a brisk hour-long walk. How many liters of ice water (0° C) would you have to drink in order to use up 422 kilocalories of metabolic energy? For comparison, the stomach can hold about 1 liter.arrow_forward
- You 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_forwardA patient has suffered blood loss and a health care provider is preparing a saline solution for injection. The osmotic pressure of red blood cell is 7 atm, and the prepared solution should be isotonic with those cells. Note: body temperature is 37.15°C and that the gas constant R is 8.206×10 -2 L'atm K-mol The conversion of temperature from °C to Kelvin is T in K = T°C+273.15 (a) To prepare the saline solution, how many moles n of solute should be put into 2 L of distilled water? n = mol (b) Mistakenly, the concentration of the solution is only 1/4 of what it should be. What would be the net osmotic pressure exerted on the walls of the red blood cells? Hint: The concentrations inside the cell and outside the cell are now different. How can you calculate the net osmotic pressure? net = (c) The solution from part B is: atm (d) The diameter of a typical red blood cell is 5.98 μm. Calculate the net force the solution experiences across the cell membrane. Hint: We can assume that the red…arrow_forwardA patient has suffered blood loss and a health care provider is preparing a saline solution for injection. The osmotic pressure of red blood cell is 7.05 atm, and the prepared solution should be isotonic with those cells. Note: body temperature is 37.15°C and that the gas constant R is 8.206×10 The conversion of temperature from °C to Kelvin is T in K = T°C+273.15 -2 L'atm K-mol (a) To prepare the saline solution, how many moles n of solute should be put into 2 L of distilled water? n = mol (b) Mistakenly, the concentration of the solution is only 1/4 of what it should be. What would be the net osmotic pressure exerted on the walls of the red blood cells? Hint: The concentrations inside the cell and outside the cell are now different. How can you calculate the net osmotic pressure? Пnet = (c) The solution from part B is: atm (d) The diameter of a typical red blood cell is 6.04 μm. Calculate the net force the solution experiences across the cell membrane. Hint: We can assume that the…arrow_forward
- The reaction rate for the prepupal development of male Drosophila is temperature-dependent. Assuming that the reaction rate is exponential as in R ∝ e−Ea/(kBT), the activation energy for this development is 3.41 × 10−19 J. A Drosophila is originally at 19.00°C, and its temperature is increasing. If the rate of development has increased 3.50%, how much has its temperature increased? The value of the Boltzmann constant is 1.381 × 10−23 J/Karrow_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_forwardAlligators and other reptiles don’t use enough metabolic energy to keep their body temperatures constant. They cool off at night and must warm up in the sun in the morning. Suppose a 300 kg alligator with an early-morning bodytemperature of 25°C is absorbing radiation from the sun at a rate of 1200 W. How long will the alligator need to warm up to a more favorable 30°C? (Assume that the specific heat of the reptilian body is the same as that of the mammalian body.)arrow_forward
arrow_back_ios
arrow_forward_ios
Recommended textbooks for you
College PhysicsPhysicsISBN:9781285737027Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning
Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
College Physics
Physics
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Cengage Learning
Principles of Physics: A Calculus-Based Text
Physics
ISBN:9781133104261
Author:Raymond A. Serway, John W. Jewett
Publisher:Cengage Learning
Physics for Scientists and Engineers: Foundations...
Physics
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Cengage Learning