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ss7ja [257]
3 years ago
5

A spherical steel container 3 feet in diameter is buried in a land fill. The container is filled with a chemical that keeps the

outer surface of the container at 100°F, whereas the earth's surface is at 50°F. Determine the heat transfer from the container if it is buried under 3 feet of earth.
Engineering
1 answer:
zmey [24]3 years ago
5 0

Answer:

Q = 378.247 Bt/hr

Explanation:

given data:

diameter of container = 3 m

so r =  1.5 m

T1 = 50°C

T2 = 100°C

depth y = 3 ft

Heat transfer is given as Q

Q = SK\Delta T

Where

S =  Shape factor for the object

S = \frac{4\pi r}{1-\frac{r}{2y}}

S = \frac{4\pi *1.5}{1-\frac{1.5}{2*3}}

S = 25.132 ft

Q = SK\Delta T

Q = 25.132*0.301 *(100-50)

Q = 378.247 Bt/hr

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3 years ago
A copper-nickel alloy of composition 60 wt% Ni-40 wt% Cu is slowly heated from a temperature of 1250°C (2280 °F). (a) At what te
makkiz [27]

Answer:

a. The very first liquid process, when heated from 1250 degree Celsius, is expected to form at the temperature by which the vertical line crosses the phase boundary (a -(a + L)) which is about <em>1310 degree Celsius. </em>

b. The structure of that first liquid is identified by the intersection with ((a+ L)-L) phase boundary; <em>47wt %of Ni</em> is of a tie line formed across the (a+ L) phase area <em>at 1310 degrees.</em>

c. To find the alloy's full melting, it is determined that the intersection of the same vertical line at 60 wt percent Ni with (a -(a+L)) phase boundary is around <em>1350 degrees.</em>

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4 0
3 years ago
Imagine you are making a pizza, you start of with the dough for the crust in a large ball. You then begin to roll out the pizza
DochEvi [55]

Answer: The force exerted on the dough.

Explanation:

The force is responsible for stimulating the stress.

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5 0
2 years ago
A tensile specimen with a 12mm initial diameter and 50mm gage length reaches maximum load at 90KN and fractures at 70KN
Aleksandr-060686 [28]

Answer:

i) 796.18 N/mm^2

ii) 1111.11 N/mm^2

Explanation:

Initial diameter ( D ) = 12 mm

Gage Length = 50 mm

maximum load ( P ) = 90 KN

Fractures at =  70 KN

minimum diameter at fracture = 10mm

<u>Calculate the engineering stress at Maximum load and the True fracture stress</u>

<em>i) Engineering stress at maximum load = P/ A </em>

= P / \pi  \frac{D^2}{4}  = 90 * 10^3 / ( 3.14 * 12^2 ) / 4

= 90,000 / 113.04 = 796.18 N/mm^2

<em>ii) True Fracture stress =  P/A </em>

= 90 * 10^3 / ( 3.24 * 10^2) / 4

= 90000 / 81  =  1111.11 N/mm^2

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2 years ago
A event that would cause an earthquake.
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Tectonic plates shifting
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3 years ago
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