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rumaithya
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Two confusing questions :(
Hello, I have two questions but I'm getting confused with them. Can someone help me please ?
____
1) A structural I beam is made of steel. A view its cross-section and its dimensions are shown in: http://web.csuchico.edu/~ma260/physics/phys.jpg
The density of the steel is 7.56 * 10^3 kg/m^3.
(a) What is the mass of a section 1.50 m long ?
(b) Assume that the atoms are predominantly iron, with atomic mass 55.9 u. How many atoms are in this section ?
____
2) The picture in http://web.csuchico.edu/~ma260/physics/phys2.JPG shows a frustrum of a cone. Of the following mensuration (gecometrical) expressions, which describes:
(a) The total circumference of the flat circular faces.
(b) The volume.
(c) The area of the curved surface ?
(i) pi(r1 + r2) [h^2 + (r1 - r2)^2]^1/2
(ii) 2pi(r1 + r2)
(iii) pi * h(r1^2 + r1r2 + r2^2)
____
Thank you.
Hello, I have two questions but I'm getting confused with them. Can someone help me please ?
____
1) A structural I beam is made of steel. A view its cross-section and its dimensions are shown in: http://web.csuchico.edu/~ma260/physics/phys.jpg
The density of the steel is 7.56 * 10^3 kg/m^3.
(a) What is the mass of a section 1.50 m long ?
(b) Assume that the atoms are predominantly iron, with atomic mass 55.9 u. How many atoms are in this section ?
____
2) The picture in http://web.csuchico.edu/~ma260/physics/phys2.JPG shows a frustrum of a cone. Of the following mensuration (gecometrical) expressions, which describes:
(a) The total circumference of the flat circular faces.
(b) The volume.
(c) The area of the curved surface ?
(i) pi(r1 + r2) [h^2 + (r1 - r2)^2]^1/2
(ii) 2pi(r1 + r2)
(iii) pi * h(r1^2 + r1r2 + r2^2)
____
Thank you.
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