An object with initial temperature 50°C is brought into a 22°C room. At noon the object's temperature was 40°C and 35°C half hour later. (a) When was the object brought into the room? (b) Find the average temperature of the object before 12:30 PM. That is, the average temperature over the time interval measured since the object was brought into the room until half past noon.

An object with initial temperature 50°C is brought into a 22°C room. At noon the object's temperature was 40°C and 35°C half hour later. (a) When was the object brought into the room? (b) Find the average temperature of the object before 12:30 PM. That is, the average temperature over the time interval measured since the object was brought into the room until half past noon.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

See similar textbooks

Similar questions

Every year Every second (1 year 365 days).
Container A and Container B were filled completely with chicken powder. The total mass of 1/3 of the chicken powder in Container B and 1/11 of the chicken powder in Container A was 570 g. If 5/11 of the chicken powder in Container A was poured out, the total mass of the chicken powder in both containers became 2.28 kg. How much chicken powder was in (a) Container A in grams? (b) Container B in grams?
Explain please
Mass of Calorimeter (g) Mass of Calorimeter + Cold Water (g) Mass of Cold Water (g) (A2- A1) Temperature of Cold Water (°c Temperature of Hot Water (°C) Final Temperature of Water (°C) A1: 52.7 A2: 107.7 21.4 44.3 30.1 Mass of Calorimeter + Cold Water + Hot A3: 215.1 Water (g) Mass of Hot Water (g) (A3 – A2) Determine the heat capacity of the calorimeter. (Remember C, = 4.18 Jg1 °C)
Automobiles are often implicated as contributors to global warming because they are a source of the greenhouse gas CO2. How many pounds of CO2 would your car release in a year if it was driven 110. miles per week? Gasoline is a complex mixture of hydrocarbons. In your calculations, assume that gasoline is octane (molecular formula C8H18) and that it is burned completely to CO2 and H2O in the engine of your car. Also assume that the car averages 27.3 miles per gallon and that the density of octane is 0.703 g cm-3.
Complete the following table. Be sure each of your answer entries has the correct number of significant digits. energy content when eaten food 口0 cal kcal kJ a slice of cooked bacon 3.60 x 10 a small apple 125. a slice of apple 1.69 x 10
The thermal conductivities of human tissues vary greatly. Fat and skin have conductivities of about 0.20 W/m · K and 0.020 W/m · K respectively, while other tissues inside the body have conductivities of about 0.50 W/m · K. Assume that between the core region of the body and the skin surface lies a skin layer of 1.0 mm, fat layer of 0.50 cm, and 3.2 cm of other tissues. (a) Find the R-factor for each of these layers, and the equivalent R-factor for all layers taken together, retaining two digits. Rskin m2 · K/W Rfat m2 · K/W Rtissue m2 · K/W R m2 · K/W (b) Find the rate of energy loss when the core temperature is 37°C and the exterior temperature is 0°C. Assume that both a protective layer of clothing and an insulating layer of unmoving air are absent, and a body area of 2.0 m2. W
A student calibrated a 10-mL graduated cylinder using water. The empty graduated cylinder weighed 24.378 grams. When it was filled with 9.89 mL of deionized water, it weighed 33.826 grams. The temperature of the water was 21.8oC. What is the density of water, based on these measurements?
On a cold day the atmospheric temperature is reported as 12.9oF. What is this temperature in Kelvin? (Please note that the constant 273.15 is an exact number).
If you are traveling to nevada and it takes 458.2 miles to get there from Coalinga, how fast will you need to drive to get there in 620 minutes?
A piece of cobalt (cp = 0.46 J/g⋅⋅°C) originally at 98.6 °C is placed into a coffee cup calorimeter containing 200.0 grams of water at 25.5 °C. The final temperature of the metal and water was 39.5 degrees Celsius. What was the mass (g) of the piece of cobalt? Do not type units into your answer.
An apartment has the dimensions 18 m by 9 m by 6 m. The temperature is 20°C, and the relative humidity is 51 percent. What is the total mass (in kg) of water vapor in the air in the apartment?