, 22.06.2019 21:10 rileyw252

# Aplane wall of a furnace is fabricated from plain carbon steel ( 60 w/m·k, 7850 kg/m3, 430 j/kg·k) and is of thickness 30 mm. to protect it from the corrosive effects of the furnace combustion gases, one surface of the wall is coated with a thin ceramic film that, for a unit surface area, has a thermal resistance of 0.01 m2·k/w. the opposite surface is well insulated from the surroundings. at furnace start-up the wall is at an initial temperature of 300 k, and combustion gases at ∞ 1300 k enter the furnace, providing a convection coefficient of 25 w/m2·k at the ceramic film. (a) how long will it take for the inner surface of the steel to achieve a temperature of ts, i = 1200 k? (b) what is the temperature ts, o of the exposed surface of the ceramic film at this time?

## Answers

Answer from: Quest
The objects are acted upon by only one force. gravity. mass times the acceleration of gravity (-9.81meters/second squared).
Answer from: Quest
Answerboth technicians (a) and (b);
Answer from: Quest
Since you have not included the experiment situation and the data, of course, i can not give you specific details about it. but i can you with this question.1) i will assume that the motion is projectile (parabolic) motion.2) yes, the horizontal distance depends on the horizontal velocity as, naming vx the horizontal velocity and t the time, it is: x = vx × t3) now, observe that the flight time depends on the vertical velocity as, naming voy the initial vertical velocity, t the time and y the vertical distance before reaching the ground: y = yo + voy×t - gt² / 2.the higher the initial vertical velocity (voy) the longer the object will be flying and so t will be higher in the equation for the horizontal distance.that explains the relationship between the horizontal distance and the horizontal velocity.
Answer from: Quest

96.77 amp

explanation:

rl = 250/100 = 2.5 ohms.

egl = 250 + (100 × 0.1) + 2 = 262 v.

at 700 r.p.m., eg2 = 262 × 700/1000 = 183.4 v.

if ia is the new current, then eg2 - 2 - (ia × 0.1) = 2.5 ia

which means this will give ia = 96.77 amp.

### Other questions on the subject: Physics

Physics, 22.06.2019 07:10, naomicervero
If 112 moles of ideal mono-atomic gas initially at 500 kpa undergoes isothermal expansion from 0.555 m^3 to 2.56 m^3 then (a) what is the initial and final temperatures of the gas ? (b) how much work is done during this process ?
Answers: 2
Physics, 22.06.2019 15:00, katyym80
You hang a book bag on a spring scale and place the bag on a platform scale so that the platform scale reads 23.7n and the spring scale reads 13.8n. what is the magnitude of the force that earth exerts on the bag?
Answers: 1
Physics, 22.06.2019 17:30, ghernadez
Abeam of electrons with an energy of 1000 ev impinges on a double slit apparatus. the resultant double slit interference pattern had maxima spaced 9 cm apart on the screen used for detection. assume the small angle remains valid, what is the spacing if the velocities of the electrons are increased 3-fold
Answers: 1
Physics, 22.06.2019 17:50, manou76
Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?
Answers: 1
You know the right answer?
Aplane wall of a furnace is fabricated from plain carbon steel ( 60 w/m·k, 7850 kg/m3, 430 j/kg·k) a...

### Questions in other subjects:

Mathematics, 10.03.2021 14:00
Questions on the website: 13539517