Learning Goal: Calorimetry: Three Substances The ceramic coffee cup in the figure with m = 118 g and c = 1090 J/(kg - K), is initially at room temperature (24.0 °C). Coffee and cream will be added to the cup. Assume that no heat is exchanged with the surroundings, and that the specific heat of coffee and cream are the same as the specific heat of water, c = 4186 J/(kg.K) In both of the two situations, the same amount of coffee 220 g at the same initial temperature 79.0 C is added to the cup. But different amounts of cream of 6.0 °C is added to the cup. note: J/(kg. K) =J/(kg. °C) After 220 g of 79.0°C coffee and unknown amount of 6.0 °C cream are added to the cup, the equilibrium temperature of the system (Coffee + Cream + Cup) is measured to be 58.0 °C. How much cream in grams was added? Follow the steps in "hints". Enter the mass of the cream in Grams, keep 2 digits after the decimal point ► View Available Hint(s) mass of cream mcream = Submit 15| ΑΣΦ Part B www ? grams New Situation: The amount of coffee is still 220 g, its initial temperature is still 79.0 °C. Now the coffee and 23.0 g of 6.0 °C cream are added to the cup with the same mass and same initial temperature as in Part A. You will find the final temperature of the system (Coffee + Cream + Cup) when thermal equilibrium is reached. If 220 g of 79.0°C coffee and 23.0 g of 6.0 °C cream are added to the cup, what is the equilibrium temperature of the system? Follow the steps in "hints".

Compare the rate of heat conduction through a 13.0-cm-thick wall that has an area of 10.0 m2 and a thermal conductivity that of glass wool with the rate of heat conduction through a 0.750-cm-thick window that has an area of 2.00 m2, assuming the same temperature difference across each.

At high noon, the Sun delivers 1 000 W to each square meter of a blacktop road. If the hot asphalt transfers energy only by radiation, what is its steady-state temperature?

An astronaut performing an extra-vehicular activity (space walk) shaded from the Sun is wearing a spacesuit that can be approximated as perfectly white ( e=0 ) except for a 5 cm × 8 cm patch in the form of the astronaut's national flag. The patch has emissivity 0.300. The spacesuit under the patch is 0.500 cm thick, with a thermal conductivity k 0.0600 W/m , and its inner surface is at a temperature of 20.0 . What is the temperature of the patch, and what is the rate of heat loss through it? Assume the patch is so thin that its outer surface is at the same temperature as the outer surface of the spacesuit under it. Also assume the temperature of outer space is 0 K. You will get an equation that is very hand to solve in closed form, so can solve it numerically with a graphing calculator, with software, or even by trial and error with a calculator.

Some gun fanciers make their own bullets, which involves melting lead and casting it into lead slugs. How much heat transfer is needed to raise the temperature and melt 0.500 kg of lead, stating from 25.0 ?

A 100-g piece of copper, initially at 95.0C, is dropped into 200 g of water contained in a 280-g aluminum can; the water and can are initially at 15.0C. What is the final temperature of the system? (Specific heats of copper and aluminum are 0.092 and 0.215 cal/g C. respectively.) (a) 16C (b) 18C (c) 24C (d) 26C (e) none of those answers

(a) If the partial pressure of water vapor is 8.05 torr, what is the dew point? (760 torr = I atm 101, 325 Pa) (b) On a warn day when the air temperature is 35 and the dew point is 25 , what are the partial of the water in the air and the relative humidity?

A temperature of 162F is equivalent to what temperature in kelvins? (a) 373 K (b) 288 K (c) 345 K (d) 201 K (e) 308 K

What would be the final temperature of the pan and water in Calculating the Final Temperature When Heat Is Transferred Between Two Bodies: Pouring Cold Water in a Hat Pan if 0.260 kg of water was placed in the pan and 0.0100 kg of the water evaporated immediately, leaving the remainder to come to a common temperature with the pan?

Rubbing your hands together warms them by converting work into thermal energy. If a woman rubs her hands back and forth for a total of 20 rubs, at a distance of 7.50 cm per nub, and with an average frictional force of 40.0 N, what is the temperature increase? The mass of tissues warned is only 0.100 kg, mostly in the palms and fingers.