#584 Hydrostatic Force on a Beach Dam

Hydrostatic Force on a Beach Dam - Mechanical Engineering

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Hydrostatic Force on a Beach Dam

The concrete seawall has a curved surface and restrains seawater at a depth of 24 ft. The trace of the surface is a parabola as illustrated. Determine the moment of the fluid force (per unit length) with respect to an axis through the toe (point A).

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#310 The hoist shown is used in a machine

The hoist shown is used in a machine - Mechanical Engineering

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#301 The shafts is hollow from A to B and

The shafts is hollow from A to B and - Mechanical Engineering

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The shafts is hollow from A to B and solid from B to C. The shaft has an outer diameter of 80 mm, and the thickness of the wall of the hollow segment is 10 mm. Determine the maximum shear stress developed in the shaft. Also, compute the angle of rotation at the end A. Assume Shear Modulus = 12 x 10 Psi.

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In given question, first of all we have to determine twisting moment acting on each shaft. The cross section have maximum twisting moment will have maximum shear stress at the surface of the shaft. I have directly used expression for maximum shear stress for hollow and solid shaft. Similarly for determining angle of rotation, i have used direct expression for hollow and solid shaft. Please refer below screenshot for more detailed solution.

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#227 What are some of the principal irreversibilities present

What are some of the principal irreversibilities present - Mechanical Engineering

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ChemistryExplain “#227 What are some of the principal irreversibilities present in Mechanical Engineering, Best colleges for mechanical engineering

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What are some of the principal irreversibilities present during the ation of

(a) an automobile engine,

(b) a household refrigerator,

(c) a gas-fired water heater,

(d) an electric water heater?

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Principal irreversibilities-

(a) Automobile Engine-

1.mechanical friction between moving parts

2.wear and corrosion

3.heat transfer across finite temperature differences

4.chemical reactions

(b) Household Refrigerator

1.isenthalpic throttling

2.Fluid friction

3.heat transfer to and from the surroundings.

(c) Gas fired water heater

1.heat interaction with surroundings

2.combustion

(d) Electric water heater

1.electrical resistance

2.copper losses

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#127 For the one-dimensional fluid-flow problem with velocity known

For the one-dimensional fluid-flow problem with velocity known - Mechanical Engineering

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For the one-dimensional fluid-flow problem (Figure P14â4) with velocity known at the right end, determine the velocities and the volumetric flow rates at nodes 1 and 2. Let K_xx = 2 cm/s.

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The following figure represents one-dimensional flow through the porous media:

From the preceding figure the following is the element stiffness matrix for the element-1:

â¦â¦ (1)
Here

is the permeability of the porous medium of element 1,

is length of the element and

is area of the element.
Substitute

for

,

for

and

for

in the equation (1):

From the preceding figure the following is the element stiffness matrix for the element-2:

â¦â¦ (2)
Here

is the permeability of the porous medium of element 2,

is length of the element and

is area of the element.
Substitute

for

,

for

and

for

in the equation (2):

Calculate the global Stiffness matrix by using the following formula:

â¦â¦ (3)

The following matrix is the global nodal potential:

â¦â¦ (4)

The following matrix is the force matrix:

â¦â¦ (5)

Calculate the elemental force of the element-1 by using the following formula:

â¦â¦ (6)
Here

is velocity flow rate and

is area of the element.
Substitute

for

and

for

equation (6):

The elemental velocity at the remaining elements 1 and 2 is equal to zero.

The following are the potential boundary conditions:
The potential of element 1 is of the following: