Assessment Preparation Checklist: Read Chapters 12, 13, and 14 from the textbook
ID: 2282686 • Letter: A
Question
Assessment Preparation Checklist: Read Chapters 12, 13, and 14 from the textbook, Applied Physics. These chapters will help you understand the principles of matter and fluids, temperature, and heat transfer. Go through the topics on density and temperature in the lesson for this module, which explore the concept of heat transfer. Title: Thermodynamics Solve the following problems: 1. Would the mass density of an object be the same if the object were on the moon rather than on the earth? Would the weight density be the same? 2. A steel column in a building has a cross-sectional area of 3500 cm^2 and supports a weight of 2.5 x 10^5 N. Find the stress on the column. 3. Each vertical steel column of an office building supports a weight of 1.30 x 10^5 N and is compressed to 5.90 x 10^-3 cm. a. Find the compression in each column if a weight of 5.50 x 10^5 N is supported. b. If the compression of each steel column is 0.0710 cm, what weight is supported by each column? 4. The specific gravity of an unknown substance is 0.80. Will it float on or sink in gasoline? 5. In a deep dive, a whale is appreciably compressed by the pressure of the surrounding water.Explanation / Answer
2. stress = Force/area
Stress = 2.5e 5/(3500e -4)
stress = 7.14*10^5 N/m^2
3.a. Youngs modlulus Y of a material is given Y = FL/ADL
A = area, DL = change of length
L = original length, F = force
Y of steel = 2.1 e 11 N/m^2
so here we apply
F/DL is constnat
F2/F1 = DL2/DL1
DL2 = 5.9 e-3 * 5.5e5/(1.3 e5)
DL2 = 24.96 e-3 cm
b. again F2 = F1 * DL2/DL1
F2 = 1.3 e5 * 0.0710/(5.9 e-3)
F2 = 1.56 *10^6 N