1 Proof that a solid aluminum block of 4 mm x 3 mm x 3 mm, such as shown in Figure Q1 (a), can float on water at 20 °C due to the effect of surface tension. The density of the aluminum block is 2700 kg/m3 . Determine the contact angle.

1 Proof that a solid aluminum block of 4 mm x 3 mm x 3 mm, such as shown in Figure Q1 (a), can float on water at 20 °C due to the effect of surface tension. The density of the aluminum block is 2700 kg/m3 . Determine the contact angle.

Engineering Fundamentals: An Introduction to Engineering (MindTap Course List)

5th Edition

ISBN:9781305084766

Author:Saeed Moaveni

Publisher:Saeed Moaveni

Chapter12: Electric Current And Related Variables In Engineering

Section12.2: Electrical Circuits And Components

Problem 6BYG

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Concept explainers

Material Properties

Construction in civil engineering demands high strength, durability, and longevity. These targets can be achieved by better design and analysis, along with the correct choice of materials. Different materials have different properties and hence, they respond and performs differently under the various condition of external loadings. It is therefore a critical task of an engineer to select the right material based on the property that the material is supposed to function in real-time. When speaking about the property, there are different categories of material properties like chemical property, physical property, mechanical property, electrical property, magnetic property, thermal property, etc. These material properties form the basis of material selection in various applications.

Question

1 Proof that a solid aluminum block of 4 mm x 3 mm x 3 mm, such as shown in Figure
Q1 (a), can float on water at 20 °C due to the effect of surface tension. The density of
the aluminum block is 2700 kg/m3
. Determine the contact angle.

2. A solid alloy cylinder having a diameter of 6.48 cm slides downward at a terminal
velocity of V through a vertical pipe. The downward motion is resisted by an oil film
between the piston and the pipe wall. Determine the oil viscosity when the velocity
V is 5 m/s. The inner diameter of the vertical pipe is 6.5 cm, and the alloy density is
3500 kg/m3
.

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