1.79 Asbestos is a fibrous silicate mineral with remarkably high tensile strength. But it is no longer used because airborne asbestos particles can cause lung cancer. Grunerite, a type of asbestos, has a tensile strength of 3.5x102 kg/mm2 (thus, a strand of grunerite with a 1-mm cross-sectional area can hold up to 3.5x10 kg). The tensile strengths of aluminum and Steel No.5137 are 2.5x10 lb/in? and 5.0x10 lb/in, respectively. Calculate the cross-sectional areas (in mm²) of wires of aluminum and of Steel No. 5137 that have the same tensile strength as a fiber of grunerite with a cross- sectional area of 1.0 um".

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Only questions 79 please
(a) Will the ball float if it is evacuated?
(b) Will it float if filled with carbon dioxide (d = 1.830 g/L)?
(c) Will it float if filled with hydrogen (d = 0.0899 g/L)?
(d) Will it float if filled with oxygen (d = 1.330 g/L)?
(e) Will it float if filled with nitrogen (d 1.165 g/L)?
(f) For any case in which the ball will float, how much weight
must be added to make it sink?
%D
1.79 Asbestos is a fibrous silicate mineral with remarkably high
tensile strength. But it is no longer used because airborne asbestos
particles can cause lung cancer. Grunerite, a type of asbestos, has
a tensile strength of 3.5x102 kg/mm2 (thus, a strand of grunerite
with a 1-mm cross-sectional area can hold up to 3.5x10 kg). The
tensile strengths of aluminum and Steel No.5137 are 2.5x10 lb/in?
and 5.0x10 lb/in?, respectively. Calculate the cross-sectional
areas (in mm²) of wires of aluminum and of Steel No. 5137 that
have the same tensile strength as a fiber of grunerite with a cross-
sectional area of 1.0 µm“.
1.80 Earth's oceans have an average depth of 3800 m, a total sur-
face area of 3.63x10 km², and an average concentration of dis-
solved gold of 5.8x10 g/L. (a) How many grams of gold are in
the oceans? (b) How many cubic meters of gold are in the oceans?
(c) Assuming the price of gold is $1595/troy oz, what is the value
of gold in the oceans (1 troy oz = 31.1 g; d of gold = 19.3 g/cm')?
%3D
1.81 Brass is an alloy of copper and zinc. Varying the mass per-
centages of the two metals produces brasses with different proper-
ties. A brass called yellow zinc has high ductility and strength and
is 34-37% zinc by mass. (a) Find the mass range (in g) of copper
in 185 g of yellow zinc. (b) What is the mass range (in g) of zinc
in a sample of yellow zinc that contains 46.5 g of copper?
(a) Which show(s) a physical change?
(b) Which show(s) a chemical change?
(G) Which result(s) in different physical properties?
Liquid
nit
1.82
erature in °F?
s 809 g/L and
at chemical properties?
Transcribed Image Text:(a) Will the ball float if it is evacuated? (b) Will it float if filled with carbon dioxide (d = 1.830 g/L)? (c) Will it float if filled with hydrogen (d = 0.0899 g/L)? (d) Will it float if filled with oxygen (d = 1.330 g/L)? (e) Will it float if filled with nitrogen (d 1.165 g/L)? (f) For any case in which the ball will float, how much weight must be added to make it sink? %D 1.79 Asbestos is a fibrous silicate mineral with remarkably high tensile strength. But it is no longer used because airborne asbestos particles can cause lung cancer. Grunerite, a type of asbestos, has a tensile strength of 3.5x102 kg/mm2 (thus, a strand of grunerite with a 1-mm cross-sectional area can hold up to 3.5x10 kg). The tensile strengths of aluminum and Steel No.5137 are 2.5x10 lb/in? and 5.0x10 lb/in?, respectively. Calculate the cross-sectional areas (in mm²) of wires of aluminum and of Steel No. 5137 that have the same tensile strength as a fiber of grunerite with a cross- sectional area of 1.0 µm“. 1.80 Earth's oceans have an average depth of 3800 m, a total sur- face area of 3.63x10 km², and an average concentration of dis- solved gold of 5.8x10 g/L. (a) How many grams of gold are in the oceans? (b) How many cubic meters of gold are in the oceans? (c) Assuming the price of gold is $1595/troy oz, what is the value of gold in the oceans (1 troy oz = 31.1 g; d of gold = 19.3 g/cm')? %3D 1.81 Brass is an alloy of copper and zinc. Varying the mass per- centages of the two metals produces brasses with different proper- ties. A brass called yellow zinc has high ductility and strength and is 34-37% zinc by mass. (a) Find the mass range (in g) of copper in 185 g of yellow zinc. (b) What is the mass range (in g) of zinc in a sample of yellow zinc that contains 46.5 g of copper? (a) Which show(s) a physical change? (b) Which show(s) a chemical change? (G) Which result(s) in different physical properties? Liquid nit 1.82 erature in °F? s 809 g/L and at chemical properties?
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