Exam 17: Temperature and Heat

A certain metal has a coefficient of linear expansion of 2.00 × 10^-5 K^-1.It has been kept in a laboratory oven at 325°C for a long time.It is now removed from the oven and placed in a freezer at -145°C.After it has reached freezer temperature,the percent change in its density during this process is closest to

A heat conducting rod,0.90 m long,is made of an aluminum section that is 0.10 m long,and a copper section that is long.Both sections have cross-sectional areas of The aluminum end is maintained at a temperature of and the copper end is at The thermal conductivity of aluminum is and of copper is .Steady state has been reached,and no heat is lost through the well-insulated sides of the rod.The temperature of the aluminum-copper junction in the rod is closest to

A block of ice at 0.000°C is added to a well-insulated 147-g aluminum calorimeter cup that holds 200 g of water at 10.0°C.The water and aluminum cup are in thermal equilibrium,and the specific heat of aluminum is 910 J/(kg • K).If all but 2.00 g of ice melt,what was the original mass of the block of ice? The specific heat of water is 4190 J/(kg • K),its latent heat of fusion is 334 kJ/kg,and its latent heat of vaporization is 2260 kJ/kg.

Heat is added to a pure substance in a closed container at a constant rate.The figure shows a graph of the temperature of the substance as a function of time.If L_f = latent heat of fusion and L_v = latent heat of vaporization,what is the value of the ratio L_v / L_f for this substance?

A glass flask has a volume of 500 mL at a temperature of 20°C.The flask contains of mercury at The temperature of the mercury and flask is raised until the mercury reaches the reference mark.The coefficients of volume expansion of mercury and glass are and ,respectively.The temperature at which this occurs is closest to

When a vapor condenses,

Two metal rods,one silver and the other copper,are both attached to a steam chamber as shown in the figure,with a temperature of 100°C,at one end,and an ice water bath,with a temperature of 0°C,at the other.The rods are 5.0 cm long and have a square cross-section, on a side.When steady state has been reached,how much heat flows through the two rods in 1.0 min? The thermal conductivity of silver is ,and that of copper is .No heat is exchanged between the rods and the surroundings,except at their ends.

Suppose that a steel bridge,1000 m long,was built without any expansion joints and that only one end of the bridge was held fixed.What would the difference in the length of the bridge be between winter and summer,taking a typical winter temperature as 0.00°C,and a typical summer temperature as 40°C? The coefficient of thermal expansion of steel is .

It is necessary to determine the specific heat of an unknown object.The mass of the object is measured to be 199.0 g.It is determined experimentally that it takes 16.0 J to raise the temperature 10.0°C.Find the specific heat of the object.

The exterior of a supersonic airplane is made of aluminum,which has a coefficient of linear expansion of .At 15°C,the plane measures 62.1 m in length.When the plane is in flight,friction with the air increases the temperature of the exterior skin to 200°C.What is the change in the length of the outer skin of the plane?

A 200-g metal container,insulated on the outside,holds 100 g of water in thermal equilibrium at A 21-g ice cube,at the melting point,is dropped into the water,and when thermal equilibrium is reached the temperature is 15.00°C.Assume there is no heat exchange with the surroundings.For water,the specific heat is 4190 J/kg • K and the heat of fusion is .The specific heat for the metal is closest to

A 905-g meteor impacts the earth at a speed of 1629 m/s.If all of its energy is entirely converted to heat in the meteor,what will be the resulting temperature rise of the meteor,assuming it does not melt? The specific heat for the meteor material is ,which is about the same as that of iron.

When a solid melts,

A machinist needs to remove a tight fitting pin of material A from a hole in a block made of material B.The machinist heats both the pin and the block to the same high temperature and removes the pin easily.What statement relates the coefficient of thermal expansion of material A to that of material B?

A person makes ice tea by adding ice to 1.8 kg of hot tea,initially at 80°C.How many kilograms of ice,initially at 0.00°C,are required to bring the mixture to 10°C? The heat of fusion of ice is 334 kJ/kg,and we can assume that tea has essentially the same thermal properties as water,so its specific heat is 4190 J/(kg • K).

A substance has a melting point of 20°C and a heat of fusion of .The boiling point is 150°C and the heat of vaporization is at a pressure of 1.0 atm.The specific heats for the solid,liquid,and gaseous phases are , ,and ,respectively.The quantity of heat given up by 0.50 kg of the substance when it is cooled from 170°C to 88°C,at a pressure of 1.0 atmosphere,is closest to

The coefficient of volume expansion of olive oil is 0.68 × 10^-3 K^-1.A 1.00-L glass beaker is filled to the brim with olive oil at room temperature.The beaker is placed on a range and the temperature of the oil and beaker increases by 25 C°.As a result, of olive oil spill over the top of the beaker.What is the coefficient of linear expansion of the glass?

A rod,with sides insulated to prevent heat loss,has one end immersed in boiling water 100°C and the other end in a water-ice mixture at 0.00°C.The rod has uniform cross-sectional area of and length of Under steady state conditions,the heat conducted by the rod melts the ice at a rate of every 34 seconds.What is the thermal conductivity of the rod? (The heat of fusion of water is

A concrete wall of a cold storage room measures 3.0 m high,5.0 m wide,and 20 cm thick.The room temperature is maintained at -10°C and the outside temperature is 20°C The inside wall is to be covered by a layer of wood in order to reduce the rate of heat loss through the wall BY 90 percent.The thermal conductivities of concrete and wood are 0.80 W/m • K and 0.040 W/m • K,respectively.Under steady state conditions,the thickness of the layer of wood required is closest to

A solid concrete wall 4.0 m by 2.4 m and 30 cm thick,with a thermal conductivity of ,separates a basement at 18°C from the ground outside at 6°C.Under steady state conditions,how much heat flows through the wall in one hour?