A metal bar, initially at 2000K, is placed in a large tank of water at room...

A metal bar, initially at 2000K, is placed in a large tank of water at room temperature. Tank is well isolated from the environment. Between the moment bar was placed in the water and the moment when bar and water reached equilibrium, did the entropy of the metal bar increased, decreased, or remained the same? Explain.

Expert Solution

samet mamat answered 2 years ago

A metal bar of uniform cross sectional area is placed between a room at 5°F and...

A metal bar of uniform cross sectional area is placed between a room at 5°F and a room at 30°C. Half of the length of the bar is made of aluminum, the other half is made of iron, what is the temperature in the middle of the bar?

initially a large tank with a capacity of 300 gallons contains 150 gallons of clean water....

initially a large tank with a capacity of 300 gallons contains 150 gallons of clean water. A solution of salt with a concentration of 2 lb / gal flows into the tank at a rate of 50 gal / min. The solution is perfectly well mixed while the solution is extracted at a rate of 25 gal / min. Find: a) the amount of salt in the tank at the time it is filled (in pounds) b) the speed at...

5. (Mixing Problem) A very large tank is initially filled with 100 gallons of water containing...

5. (Mixing Problem) A very large tank is initially filled with 100 gallons of water containing 5 pounds of salt. Beginning at time t = 0, a brine solution with a concentration of 1 pound of salt per gallon flows into the top of the tank at 3 gallons per second, the mixture is stirred, and the mixture flows out of the bottom of the tank at 2 gallons per second. (a) Letting w = pounds of salt in the...

Suppose that a large mixing tank initially holds 500 gallons of water in which 50 pounds...

Suppose that a large mixing tank initially holds 500 gallons of water in which 50 pounds of salt have been dissolved. Another brine solution is pumped into the tank at a rate of 3 gal/min, and when the solution is well stirred, it is then pumped out at a slower rate of 2 gal/min. If the concentration of the solution entering is 2 lb/gal, determine a differential equation (in lb/min) for the amount of salt A(t) (in lb) in the...

Suppose that a large mixing tank initially holds 400 gallons of water in which 65 pounds...

Suppose that a large mixing tank initially holds 400 gallons of water in which 65 pounds of salt have been dissolved. Another brine solution is pumped into the tank at a rate of 6 gal/min, and when the solution is well stirred, it is pumped out at a slower rate of 5 gal/min. If the concentration of the solution entering is 3 lb/gal, find the amount of salt in the tank after 10 minutes. PLEASE SHOW ALL WORK AND USE...

A closed, rigid tank is filled with water. Initially, the tank holds 0.6 lb of saturated...

A closed, rigid tank is filled with water. Initially, the tank holds 0.6 lb of saturated vapor and 6.0 lb of saturated liquid, each at 212°F. The water is heated until the tank contains only saturated vapor. Kinetic and potential energy effects can be ignored. Determine the volume of the tank, in ft3, the temperature at the final state, in °F, and the heat transfer, in Btu.

Problem 3.034 A closed, rigid tank is filled with water. Initially, the tank holds 0.4 lb...

Problem 3.034 A closed, rigid tank is filled with water. Initially, the tank holds 0.4 lb of saturated vapor and 4.0 lb of saturated liquid, each at 212°F. The water is heated until the tank contains only saturated vapor. Kinetic and potential energy effects can be ignored. Determine the volume of the tank, in ft3, the temperature at the final state, in °F, and the heat transfer, in Btu.

A metal bar of length 30 cm, is initially at 25 oC. Then through an electrical...

A metal bar of length 30 cm, is initially at 25 oC. Then through an electrical wire heat is generated at a rate of 0.5 cal/cm3s. The left end (x = 0 cm ) is contacted with a medium at 10 oC. At the right end there is a heat loss due to the air convection at a flux of 0.6 cal/cm2s. The physical properties are, k = 2 cal/cm oC s, r = 8 g/cm3, Cp = 0.2 cal/g...

Water is boiled in a cup and its placed in a room that is 25 degrees...

Water is boiled in a cup and its placed in a room that is 25 degrees Celsius. Assume that Newton's Law of Cooling is satisfied: the rate of change in water temperature is proportional to the difference between the temperature of the water and the temperature of the environment. We take the water temperature after 7 minutes and find it to be 77 degrees Celsius. Establish and solve an initial value problem to express the temperature of the water as...

A metal rod at 38°C is placed in a room at a constant temperature of 0°C....

A metal rod at 38°C is placed in a room at a constant temperature of 0°C. (a) If after 20 minutes the temperature of the rod is 20°C, find the temperature function T(t) that models the temperature T of the rod at time t. Assume Newton's Law of Cooling. Note: You must state the differential equation that models this situation and include how to solve this DE as part of your solution. (b)Determine the time it will take for the...

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