Question

In: Mechanical Engineering

A 20 kg block of iron and a 50 kg block of lead are sealed together...

A 20 kg block of iron and a 50 kg block of lead are sealed together in a tank with 5 kg of air. Initially the iron, lead, and air are at 200°C, 150°C, and 20°C, respectively. The air is initially at 100 kPa. After some time, the final system reaches thermal equilibrium and the air pressure inside the tank is 141 kPa. How much heat transfer occurred between the tank and the surrounding 20°C air? How much total entropy has been generated? There is air inside and outside of the tank.

Solutions

Expert Solution


Related Solutions

the mass of block A is 80 kg, the mass of block b is 20 kg,...
the mass of block A is 80 kg, the mass of block b is 20 kg, and A is connected to B with the cable and pulley system shown. the pulleys rotate freely, and the cable and pulleys have negligible mass. the coefficient of static fricion between A and the horizontal surface is Ms=0.4, and the coefficient of kinetic friction is Mk=0.3. a) initially, block A is being held stationary and the system is at rest in static equilibrium ....
A 20 gram iron block at an initial temperature of 20oC is placed in 20 grams...
A 20 gram iron block at an initial temperature of 20oC is placed in 20 grams of water at an initial temperature of 80oC. Assuming no heat is lost to the surroundings, what would be the final temperature of the system once you reach thermal equilibrium? CSiron=0.449JgoC CSwater=4.18JgoC 74.2o C 80.0o C 25.8o C 50.0o C 112o C
A 1.5 kg block of iron at 32 ∘C is rapidly heated by a torch such...
A 1.5 kg block of iron at 32 ∘C is rapidly heated by a torch such that 14 kJ is transferred to it. What temperature would the block of iron reach (assuming the complete transfer of heat and no loss to the surroundings)? If that same amount of heat (14 kJ ) was quickly transferred to a 890 g pellet of copper at 31 ∘C, what temperature would the copper reach before it begins losing heat to the surroundings? Use...
A 30.0 kg block is released at the top of a 20° frictionless incline. The block...
A 30.0 kg block is released at the top of a 20° frictionless incline. The block slides down the incline and compresses a spring (k=800 N/m) by 0.75 meters. What is the total distance the block traveled? It should be 1.5m
A 3 kg block (block A) is released from rest at the top of a 20...
A 3 kg block (block A) is released from rest at the top of a 20 m long frictionless ramp that is 3 m high. At the same time, an identical block (block B) is released next to the ramp so that it drops straight down the same 3 m. Find the values for each of the following for the blocks just before they reach ground level. (a) gravitational potential energy Block A____J Block B____J (b) kinetic energy Block a____...
6. A clay block and a steel block, each of mass 20 kg, sit on the...
6. A clay block and a steel block, each of mass 20 kg, sit on the edge of a frictionless table. The table is 120 cm high. A person throws a ball of mass 300 grams at each one at a speed of 30 m/s. The ball thrown at the clay block lodges inside it; the ball thrown at the steel block bounces off, traveling back in the direction that it came from at 20 m/s. Both blocks are knocked...
An iron block of mass miron = 1 kg at a temperature of Tiron = 200°C...
An iron block of mass miron = 1 kg at a temperature of Tiron = 200°C is thrown in sub-cooled water of mass m at Twater = 25°C enclosed in an insulated container. Calculate and plot in Excel or in similar programs the entropy generated as a result of the heat transfer process for a range of water mass values between 10 kg and 10,000 kg. (Please submit your Excel sheet or your computer program with the homework.
A cast iron saucepan of mass 4.4 kg is filled with 20 L of water at...
A cast iron saucepan of mass 4.4 kg is filled with 20 L of water at 25 °C, placed on an electric hotplate, and initially brought up to boiling point. Further heat is applied until half of the water has boiled off. What is the cost of the energy used if electricity costs 30 cents per kWh and the hotplate has an efficiency of 75%?
A block of mass 2 kg and a block of mass 3 kg are sliding on...
A block of mass 2 kg and a block of mass 3 kg are sliding on a frictionless surface. They collide and stick together. Before the collision the first block was travelling at 5 m/s in the positive x direction. After the collision the two blocks are travelling at 6 m/s in the negative x direction. What was the x component of the velocity of the second block before the collision?
A 2.0 kg block sits on a 4.0 kg block that is on a frictionless table....
A 2.0 kg block sits on a 4.0 kg block that is on a frictionless table. The coefficients of friction between the blocks are µs = 0.80 and µk = 0.20. (a) What is the maximum force F that can be applied to the 4.0 kg block if the 2.0 kg block is not to slide? ______N (b) If F is half this value, find the acceleration of each block. ______m/s2 (2.0 kg block) ______m/s2 (4.0 kg block) --Find the...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT