A very large piece of carbon steel (? = 7854 kg/m3 , ? = 60.5 W/m·K,...

A very large piece of carbon steel (? = 7854 kg/m3 , ? = 60.5 W/m·K, ?? = 434 J/kg·K) is initially at a temperature of 40°C. Suddenly, the flat surface of the steel is pressed into contact with an object at a temperature of 20°C. Which of the following is closest to the temperature of the steel at a location 10 mm from the flat surface after 0.5 s?

Expert Solution

Amanda K answered 6 months ago

A thick steel slab (ρ= 7800 kg/m3, c= 480 J/kg·K, k= 50 W/m·K) is initially at...

A thick steel slab (ρ= 7800 kg/m3, c= 480 J/kg·K, k= 50 W/m·K) is initially at 300°C and is cooled by water jets impinging on one of its surfaces. The temperature of the water is 25°C, and the jets maintain an extremely large, approximately uniform convection coefficient at the surface. Assuming that the surface is maintained at the temperature of the water throughout the cooling, how long will it take for the temperature to reach 50°C at a distance of...

3) A piece of metal with a mass of 3.8 kg and density of 1808 kg/m3...

3) A piece of metal with a mass of 3.8 kg and density of 1808 kg/m3 is suspended from a string and then completely immersed in a container of water. The density of water is 1000 kg/m3 . (a) Determine the volume of the piece of metal. (b) Determine the tension in the string after the metal is immersed in the container of water. SHOW ALL WORK AND FORMULAS! THANKS!

A stainless steel ball (? = 8055 kg/m3 , CP = 480 J/Kg? K ) of...

A stainless steel ball (? = 8055 kg/m3 , CP = 480 J/Kg? K ) of diameter D = 15cm is removed from the oven at a uniform temperature of 350 Degrees C. The ball is then subjected to the flow of air at 1 atm pressure and 30 degrees C with a velocity of 6m/s. The surface temperature of the ball eventually drops to 250 degrees 250 degrees C. Determine the average convection heat transfer coefficient during this cooling...

Water ( ρ= 1000 kg/m3; Cp= 4.2 kJ/kg.K; k= 0.58 W/m.K ) at 1,537 kg/hr and...

Water ( ρ= 1000 kg/m3; Cp= 4.2 kJ/kg.K; k= 0.58 W/m.K ) at 1,537 kg/hr and 26oC enters a 10-mm-diameter smooth tube whose wall temperature is maintained at 79oC. If the water's Nusselt number (Nu) = 375, and the tube length is 7.6, calculate the water outlet temperature,in oC.

Problem 3 a. A 25-kg piece of equipment can be hung by steel wires of length...

Problem 3 a. A 25-kg piece of equipment can be hung by steel wires of length 1.00 m, 2.00 m, or 3.00 m. (a) If all the wires have the same diameter, which one will stretch the greatest distance? (b) How do you expect your answer to change if the steel wire is replace by a copper wire, but everything else stays the same? Explain both answers b. A 0.330-kg volleyball is thrown vertically downward with an initial speed of...

1.A steel tube carries gasoline (?= 751 kg/m3) at an average velocity of 2.05 m/s. If...

1.A steel tube carries gasoline (?= 751 kg/m3) at an average velocity of 2.05 m/s. If the inside diameter of the tube is 1.27 inches, find the volume flow rate and the mass flow rate. 2.Two streams, a cold stream and a hot stream, enter a mixing chamber where both streams combine and exit through a single tube. The mass flow rate of the hot stream is 5 kg/s, and the inside diameter of the tube carrying the cold stream...

SOX was a very large piece of legislation that still has profound effects to this day....

SOX was a very large piece of legislation that still has profound effects to this day. Knowing what you now know from our reading, do you think SOX went too far, or not far enough, or just right? What provision out of SOX do you think is the most important?

A large deep lake, which initially had a uniform oxygen concentration of 1 kg/m3 , has...

A large deep lake, which initially had a uniform oxygen concentration of 1 kg/m3 , has its surface concentration suddenly raised and maintained at 9 kg/m3 concentration. a. Draw a picture of the physical process. Select a coordinate system to describe this diffusion process. Write the general form of the oxygen species continuity equation for this system. b. Reduce the general differential equation for the mass transfer process for the transfer of oxygen into the lake without the presence of...

1. A large open tank contains fresh water of constant density (p = 1000 kg/m3). a)...

1. A large open tank contains fresh water of constant density (p = 1000 kg/m3). a) Construct an algebraic expression for the absolute pressure (P) at a specific depth below the surface of the water (y) in terms of gravitational acceleration (g), the depth of water (y), and the density of water (ρ).

FIreclay brick (ρ=2050 kg/m3, cp=960 J/kg-K, k=1.1 W/m-K) with dimensions 0.06 m x 0.09 m x...

FIreclay brick (ρ=2050 kg/m3, cp=960 J/kg-K, k=1.1 W/m-K) with dimensions 0.06 m x 0.09 m x 0.20 m is removed from a kiln at 1600K and cooled in air at 40C with h = 30 W/m2-K. What is the temperature at the corner of the brick after 50 minutes of cooling? Give your answer in degrees C.

Question