One of the assumptions used when analyzing a simple truss is that the members are joined together by __________.
Answer: Smooth pins
Showing posts with label Statistics. Show all posts
Showing posts with label Statistics. Show all posts
What will be the easiest way to determine the force reaction BZ ?
What will be the easiest way to determine the force reaction BZ ?
Answer: Vector equation MA = 0
A plate is supported by a ball-and-socket joint at A, a roller joint at B, and a cable at C. How many unknown support reactions are there in this problem?
A plate is supported by a ball-and-socket joint at A, a roller joint at B, and a cable at C. How many unknown support reactions are there in this problem?
Answer: five forces
When doing a 3-D problem analysis, you have ________ scalar equations of equilibrium.
When doing a 3-D problem analysis, you have ________ scalar equations of equilibrium.
Answer: 6
If a support prevents translation of a body, then the support exerts a ___________ on the body.
If a support prevents translation of a body, then the support exerts a ___________ on the body.
Answer: Force
If a support prevents rotation of a body about an axis, then the support exerts a ________ on the body about that axis.
If a support prevents rotation of a body about an axis, then the support exerts a ________ on the body about that axis.
Answer: Couple moment
The three scalar equations, FX = FY = MO = 0, are ____ equations of equilibrium in two dimensions.
The three scalar equations, FX = FY = MO = 0, are ____ equations of equilibrium in two dimensions.
Answer: The most commonly used
The original force and couple system and an equivalent force-couple system have the same _____ effect on a body.
The original force and couple system and an equivalent force-couple system have the same _____ effect on a body.
Answer: external
Internal forces are _________ shown on the free body diagram of a whole body.
Internal forces are _________ shown on the free body diagram of a whole body.
Answer: Never
If a support prevents translation of a body, then the support exerts a ___________ on the body.
If a support prevents translation of a body, then the support exerts a ___________ on the body.
Answer: Force
A general system of forces and couple moments acting on a rigid body can be reduced to a ___ .
A general system of forces and couple moments acting on a rigid body can be reduced to a ___ .
Answer: single force and a single moment
The moment of a couple is called a _________ vector.
The moment of a couple is called a _________ vector.
Answer: free
In statics, a couple is defined as __________ separated by a perpendicular distance.
In statics, a couple is defined as __________ separated by a perpendicular distance.
Answer: two forces of equal magnitude acting in opposite directions
If r = {1 i + 2 j} m and F = {10 i + 20 j + 30 k} N, then the moment of F about the y-axis is ____ N·m.
If r = {1 i + 2 j} m and F = {10 i + 20 j + 30 k} N, then the moment of F about the y-axis is ____ N·m.
Answer: -30
The triple scalar product u • ( r F ) results in
The triple scalar product u • ( r F ) results in
Answer: a scalar quantity ( + or - ).
When determining the moment of a force about a specified axis, the axis must be along _____________.
When determining the moment of a force about a specified axis, the axis must be along _____________.
Answer: any line in 3-D space
If a particle has 3-D forces acting on it and is in static equilibrium, the components of the resultant force ( Fx, Fy, and Fz ) ___ .
If a particle has 3-D forces acting on it and is in static equilibrium, the components of the resultant force ( Fx, Fy, and Fz ) ___ .
Answer: have to equal zero, e.g., 0 i + 0 j + 0 k
If a force of magnitude F can be applied in four different 2-D configurations (P,Q,R, & S), select the cases resulting in the maximum and minimum torque values on the nut. (Max, Min).
If a force of magnitude F can be applied in four different 2-D configurations (P,Q,R, & S), select the cases resulting in the maximum and minimum torque values on the nut. (Max, Min).
Answer: (Q, S) (perpendicular to nut/wrench)
For a frictionless pulley and cable, tensions in the cable (T1 and T2) are related as _____ .
For a frictionless pulley and cable, tensions in the cable (T1 and T2) are related as _____ .
Answer: T1 = T2
When a particle is in equilibrium, the sum of forces acting on it equals ___ .
When a particle is in equilibrium, the sum of forces acting on it equals ___ .
Answer: Zero
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