. A copper pot (c = 387 J/kg.C) with a mass of 0.50 kg contains 0.20 Rg (c = 4,186 J/kg.C"), which are both at a temperature of 20.0°C. A 0.25 kg block of iron (c = 452 J/kg.C) at 90°C is dropped into the pot. Find the final temperature of the system, assuming no heat loss to the surroundings. fton The heater is

. A copper pot (c = 387 J/kg.C) with a mass of 0.50 kg contains 0.20 Rg (c = 4,186 J/kg.C"), which are both at a temperature of 20.0°C. A 0.25 kg block of iron (c = 452 J/kg.C) at 90°C is dropped into the pot. Find the final temperature of the system, assuming no heat loss to the surroundings. fton The heater is

Principles of Physics: A Calculus-Based Text

5th Edition

ISBN:9781133104261

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter17: Energy In Thermal Processes: The First Law Of Thermodynamics

Section: Chapter Questions

Problem 14P

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A high-end gas stove usually has at least one burner rated at 14 000 Btu/h. (a) If you place a 0.25-kg aluminum pot containing 2.0 liters of water at 20.C on this burner, how long will it take to bring the water to a boil, assuming all the heat from the burner goes into the pot? (b) Once boiling begins how much time is required to boil all the water out of the pot?
The specific heat of substance A is greater than that of substance B. Both A and B are at the same initial temperature when equal amounts of energy are added to them. Assuming no melting or vaporization occurs, which of the following can be concluded about the final temperature TA of substance A and the final temperature TB of substance B? (a) TA TB (b) TA TB (c) TA = TB (d) More information is needed.
A 1.00-kg block of copper at 20.0C is dropped into a large vessel of liquid nitrogen at 77.3 K. How many kilograms of nitrogen boil away by the time the copper reaches 77.3 K? (The specific heat of copper is 0.092 4 cal/g C, and the latent heat of vaporization of nitrogen is 48.0 cal/g.)
Calculate the rate of heat conduction out of the human body, assuming that the core internal temperature is 37.0 , the skin temperature is 34.0 , the thickness of the fatty tissues between the core and the skin averages 1.00 cm, and the surface area is 1.40 m2.
A granite ball of radius 2.00 m and emissivity 0.450 is heated to 135C. (a) Convert the given temperature to Kelvin. (b) What is the surface area of the ball? (c) If the ambient temperature is 25.0C, what net power does the ball radiate?
During heavy exercise, the body pumps 2.00 L of blood per minute to the surface, where it is cooled by 2.00C. What is the rate of heat transfer from this forced convection alone, assuming blood has the same specific heat as water and its density is 1050kg/m3 ?
One way to cool a gas is to let it expand. When a certain gas under a pressure of 5.00 106 Ha at 25.0C is allowed to expand to 3.00 times its original volume, its final pressure is 1.07 106 Pa. (a) What is the initial temperature of the gas in Kelvin? (b) What is the final temperature of the system? (See Section 10.4.)
A hollow aluminum cylinder 20.0 cm deep has an internal capacity of 2.000 L at 20.0C. It is completely filled with turpentine at 20.0C. The turpentine and the aluminum cylinder are then slowly warmed together to 80.0C. (a) How much turpentine overflows? (b) What is the volume of the turpentine remaining in the cylinder at 80.0C? (c) If the combination with this amount of turpentine is then cooled back to 20.0C, how far below the cylinders rim does the turpentines surface recede?
1. A cube of ice is taken from the freezer at -8.5 •C•C and placed in a 75-gg aluminum calorimeter filled with 330 gg of water at room temperature of 20.0 •C•C. The final situation is observed to be all water at 15.0 •C•C. The specific heat of ice is 2100 J/kg - CoJ/kg•Co, the specific heat of aluminum is 900 J/kg •CoJ/kg•Co, the specific heat of water is is 4186 J/kg• CoJ/kg•Co, the heat of fusion of water is 333 kJ/KgkJ/Kg. What was the mass of the ice cube? 2. When a 290-gg piece of iron at 180 •C•C is placed in a 95-gg aluminum calorimeter cup containing 250 gg of liquid at 10• C•C, the final temperature is observed to be 35 • CoC. The value of specific heat for iron is 450 J/kg •CoJ/kg •Co, and for aluminum is 900 J/kg-CoJ/kg-Co. Determine the specific heat of the liquid.
1) The best laboratory vacuum has a pressure of about 1.00 x 10-18 atm, or 1.01 x 10-13 Pa. How many gas molecules are in 5.30 cm3 in such a vacuum at 333 K? 2) Ethyl alcohol has a boiling point of 78.0 ˚C, a freezing point of -114 ˚C, a heat of vaporization of 879 kJ/kg, a heat of fusion of 109 kJ/kg, and a specific heat of 2.43 kJ/kg·K. How much energy must be removed from 0.534 kg of ethyl alcohol that is initially a gas at 78.0 ˚C so that it becomes a solid at -114 ˚C? 3)How much water remains unfrozen after 50.3 kJ is transferred as heat from 276 g of liquid water initially at its freezing point? The latent heat of fusion is 333 kJ/kg.
1. The temperature on a warm summer day is95°F. What is this temperature:a. in degrees Celsius?b. on the absolute (Kelvin) scale? 2. How much heat must be removed from a 200-gblock of copper to lower its temperature from150°C to 30°C? The specific heat capacity ofcopper is 0.093 cal/g·C°. 3. The volume of an ideal gas is increased from0.8 m3to 2.4 m3 while maintaining a constantpressure of 1000 Pa (1 Pa = 1 N/m2). How muchwork is done by the gas in this expansion?