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I'll attach the questions in a file, they are easy and short. I need them in 3 hours, because it is due tonight.
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Hi, please see the following solution. It took me a little ling because I checked the answers first before handing them in.
1)At 20°C, a brass cube has an edge length of 28 cm. What is the increase in the
cube's surface area when it is heated from 20°C to 70°C? The linear expansion
coefficient of brass is 19 × 10-6 /C°.
SOLUTION:
∆L = Lα∆T
∆L = (28 cm) × (19 × 10-6 /C°) × (70oC – 20oC) = 0.0266 cm = 2.66 × 10-2 cm
Original surface area = 6s2 = 6(28 cm)2 = 4704 cm2
New surface area = 6(28 + 2.66 x 10-2 cm)2 = 4712.94 cm2
Increase in surface area = 4712.94 cm2 – 4704 cm2 = 8.94 cm2
2) A certain diet doctor encourages people to diet by drinking ice water. His theory is
that the body must burn off enough fat to raise the temperature of t...
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