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Physics, 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?

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Answer from: Quest
The objects are acted upon by only one force. gravity. mass times the acceleration of gravity (-9.81meters/second squared).
ansver
Answer from: Quest
Answerboth technicians (a) and (b);
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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.
ansver
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.

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Aplane wall of a furnace is fabricated from plain carbon steel ( 60 w/m·k, 7850 kg/m3, 430 j/kg·k) a...

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