2. In studying for your CBEMS 125B exam, you get hungry and decide to boil some water in a pot to make instant noodles. You put your aluminum spoon, with a long handle (i.e. good to use "long fin approximation"), in the pot in anticipation of stirring the noodles into the boiling water. However, your phone rings, and you leave the spoon in the boiling water on the stove for quite a while (i.e. the system reaches steady-state conditions) before you come back to it. The boiling water is at 100°C and room temperature is 25°C. The spoon has a square handle that is 0.6 cm per side. At a handle height of 8 cm, the temperature of the long aluminum spoon is 62°C. The Royal Society for the Prevention of Accidents lists a maximum surface temperature of 58°C as a "safe" touchable temperature for metals. Is the spoon safe to pick up at a handle height of 12 cm? Justify your answer with calculations.

2. In studying for your CBEMS 125B exam, you get hungry and decide to boil some water in a pot to make instant noodles. You put your aluminum spoon, with a long handle (i.e. good to use "long fin approximation"), in the pot in anticipation of stirring the noodles into the boiling water. However, your phone rings, and you leave the spoon in the boiling water on the stove for quite a while (i.e. the system reaches steady-state conditions) before you come back to it. The boiling water is at 100°C and room temperature is 25°C. The spoon has a square handle that is 0.6 cm per side. At a handle height of 8 cm, the temperature of the long aluminum spoon is 62°C. The Royal Society for the Prevention of Accidents lists a maximum surface temperature of 58°C as a "safe" touchable temperature for metals. Is the spoon safe to pick up at a handle height of 12 cm? Justify your answer with calculations.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Layout

The layout is a way of organizing the elements, products, and raw materials in a design. The layout is the representation of information in a structural, logical, descriptive, coherent form.The layout is a mapping of various equipment arrangements, workstations, machinery, plants, and more. It secures the continuous movement of a product quantity along with the quality.

Question

2. In studying for your CBEMS 125B exam, you get hungry and decide to boil some
water in a pot to make instant noodles. You put your aluminum spoon, with a long handle
(i.e. good to use "long fin approximation"), in the pot in anticipation of stirring the
noodles into the boiling water. However, your phone rings, and you leave the spoon in
the boiling water on the stove for quite a while (i.e. the system reaches steady-state
conditions) before you come back to it. The boiling water is at 100°C and room
temperature is 25°C. The spoon has a square handle that is 0.6 cm per side. At a handle
height of 8 cm, the temperature of the long aluminum spoon is 62°C. The Royal Society
for the Prevention of Accidents lists a maximum surface temperature of 58°C as a "safe"
touchable temperature for metals. Is the spoon safe to pick up at a handle height of 12 cm?
Justify your answer with calculations.
Assume (1) No radiation effect, (2) convection heat transfer coefficient is uniform in the
pot above the boiling water, and (3) there is not heat transfer from the pot directly to the
spoon (only heat transfer into the spoon is through boiling water). State any other
assumptions you make.
Square cross-section:
0.6-cm x 0.6-cm
Height = L
Height = 0 cm

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