Beverage in cans 150 mm long and 60 mm in diameter is initially at 27°C and is to be cooled by placing it in a refrigerator comp
artment at 40°C. In the interest of maximizing cooling should the cans be laid horizontally or vertically in the compartment at 4°C. In the interest of maximizing the cooling rate, should the cans be laid horizontally or vertically in the compartment? As a first approximation, neglect heat transfer from the ends.
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Answer:
SiC=169.26 Mpa
Partially stabilized zirconia=507.77 Mpa
Explanation:
<u>SiC </u>
Stress intensity, K is given by
hence making
the subject where
is applied stress, Y is shape factor, a is crack length
substituting the given figures and assuming shape factor, Y of 1
<u>Stabilized zirconia </u>
Stress intensity, K is given by
hence making
the subject where
is applied stress, Y is shape factor, a is crack length
substituting the given figures and assuming shape factor, Y of 1
Answer with Explanation:
The crown will be pure if it's specific gravity is 19.3
Now by definition of specific gravity it is the ratio between the weight of an object to the weight of water of equal volume
Since it is given that the weight of the crown is 11.8 N we need to find it's volume
Now According to Archimedes principle when the crown is immersed into water the water shall exert a force in upwards direction on the crown with a magnitude equaling to weight of the water displaced by the crown
Mathematically this is the difference between the weight of the crown in air and weight when immersed in water
Thus Buoyant force is
Now by Archimedes principle This force equals in magnitude to the weight of water of same volume as of the crown
Thus the specific gravity of the crown equals
As we see that the specific gravity of the crown material is less than that of pure gold hence we conclude that it is impure.