A short 6061-T6 aluminum cylindrical block, having an original diameter of 20mm and a length of 75mm, is placed in a compression
machine and tightened until the applied axial load is 5kN. Determine (a) the decrease in its length and (b) its new diameter.
Un bloque cilíndrico corto de aluminio 6061-T6, que tiene un diámetro original de 20 mm y una longitud de 75 mm, se coloca en una máquina de compresión y se aprieta hasta que la carga axial aplicada sea de 5 kN. Determine (a) la disminución de su longitud y (b) su nuevo diámetro.
Un bloque cilíndrico corto de aluminio 6061-T6, que tiene un diámetro original de 20 mm y una longitud de 75 mm, se coloca en una máquina de compresión y se aprieta hasta que la carga axial aplicada sea de 5 kN. Determine (a) la disminución de su longitud y (b) su nuevo diámetro.
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Answer:
Explanation:
At the time of a body achieving terminal velocity, the drag force becomes equal to the weight of the body less the buoyant force by the surrounding medium which can be represented by the following equation
Where r is radius of the body , d is density of the material of the body σ is density of the medium and n is coefficient of viscosity of the medium and v is terminal velocity.
Simplifying
v =
Assuming the value of density of air as 1.225 kg/m³ and putting other given values in the formula we get
v = [/tex]
v = 387 x 10⁻⁵ m/s
Terminal velocity = 387 x 10⁻⁵ m/s
Time taken to fall a distance of 100 m
=
= 2.6 x 10⁴ s.