A hot dog can be considered to be a 12 centimeter long cylinder, whose diameter is...

A hot dog can be considered to be a 12 centimeter long cylinder, whose diameter is 2 cm and whose properties are ? = 980 kg/m3 , cp = 3.9 kJ/kg · K, k = 1.2 W/m · K, and ? = 2 × 10?7 m2 /s. A hot dog initially at 5?C is dropped into boiling water at 100?C. The heat transfer coefficient at the surface of the hot dog is estimated to be 600 W/m2 · K and the hot dog can be considered cooked when its center temperature reaches 80?C (a) Determine how long it will take to cook considering the hot dog as a long cylinder. (b) Determine the cooking time assuming lumped capacitance.

Expert Solution

samet mamat answered 2 years ago

A cylinder 100 mm in diameter and 80 mm long with an initial temperature of 527...

A cylinder 100 mm in diameter and 80 mm long with an initial temperature of 527 C is suddenly exposed to water at 27 C giving a convective heat transfer coefficient of 400 W/m2-K. Determine the temperature at the center of the cylinder after 10 minutes. Assume density is 8050 kg/m3, specific heat is 536 kJ/kg-K, and thermal conductivity is 18.6 W/m-K. **** Not lumped Capacitance Problem. ****

Hot forging is used to reduce a metallic cylindrical workpiece with a diameter of 12 cm...

Hot forging is used to reduce a metallic cylindrical workpiece with a diameter of 12 cm and height of 24 cm to a height of 15 cm. The coefficient of friction of the open die plate with the workpiece is 0.18 and the process takes 4 seconds to complete and at a constant speed. The strength coefficient of the workpiece C= 180 MPa and strain rate sensitivity exponent m = 0.25. calculate the following: The forging shape factor at the...

A 1-m-diameter cylinder, 1 m long, is maintained at 800 K and has an emissivity of...

A 1-m-diameter cylinder, 1 m long, is maintained at 800 K and has an emissivity of 0.65. Another cylinder, 2 m in diameter and 1 m long, encloses the first cylinder and is perfectly insulated. Both cylinders are placed in a large room maintained at 300 K. Calculate the heat lost by the inner cylinder.

Hot water was poured into an empty pop can and allowed to cool in surroundings whose...

Hot water was poured into an empty pop can and allowed to cool in surroundings whose temperature is 20 °C. The initial temperature of the water is 92 °C. After 12½ min the water temperature had dropped by 10 deg C. Assume the rate of change of the water temperature is directly proportional to the difference in the temperature between the water and its surroundings. a. What is the value of the proportionality constant? b. What is the temperature of...

A compost barrel can be considered as a solid cylinder of mass 50.0 kg and radius...

A compost barrel can be considered as a solid cylinder of mass 50.0 kg and radius of r = 30.0 cm, and a length of 0.900 m. It can be turned about the long axis by applying a force to a handle located d = 20.0 cm from the axis of the cylinder. The compost barrel needs to be turned through 250 complete revolutions. Assume you can apply a constant force of F = 10.0 N (always perpendicular to the...

Consider the daily market for hot dogs in a small city. Suppose that this market is in long-run competitive equilibrium with many hot dog stands in the city, each one selling the same kind of hot dogs.

5. Monopoly outcome versus competition outcome Consider the daily market for hot dogs in a small city. Suppose that this market is in long-run competitive equilibrium with many hot dog stands in the city, each one selling the same kind of hot dogs. Therefore, each vendor is a price taker and possesses no market power. The following graph shows the demand (D) and supply (S = MC) curves in the market for hot dogs. Place the black point (plus symbol) on the graph...

A 22-cm-diameter cylinder that is 43 cm long contains 44 g of oxygen gas at 20∘C...

A 22-cm-diameter cylinder that is 43 cm long contains 44 g of oxygen gas at 20∘C What is the reading of a pressure gauge attached to the tank?

An isosceles right triangle, whose hypotenuse is 12 ft long, is submerged vertically so that the...

An isosceles right triangle, whose hypotenuse is 12 ft long, is submerged vertically so that the hypotenuse is parallel to the surface of the water. If its vertex is 3 ft above the surface, find the total force on one side of the plate?

A 410-turn solenoid, 21 cm long, has a diameter of 4.0 cm . A 12-turn coil...

A 410-turn solenoid, 21 cm long, has a diameter of 4.0 cm . A 12-turn coil is wound tightly around the center of the solenoid. If the current in the solenoid increases uniformly from 0 to 5.0 A in 0.51 s , what will be the induced emf in the short coil during this time?

Household wiring often uses 2.0 mm diameter copper wires. The wires can get rather long as...

Household wiring often uses 2.0 mm diameter copper wires. The wires can get rather long as they snake through the walls from the fuse box to the farthest corners of your house. What is the potential difference across a 16 m long, 2.0 mm diameter copper wire carrying a 7.3 A current?

Question