A flat screen tv is mounted on the wall of a room using bracket ABC, which is fi
ID: 1849330 • Letter: A
Question
A flat screen tv is mounted on the wall of a room using bracket ABC, which is fixed in position. For comfortable viewing the tv may be rotated about line AB. For the direction angles ?x = 61?, ?y = 66.34? and ?z = 141? for the 27 N force at point D, determine the moment of this force about line AB. Note: for the coordinates of point D given, the top and bottom edges of the tv are not parallel to the x axis.
A flat screen tv is mounted on the wall of a room using bracket ABC, which is fixed in position. For comfortable viewing the tv may be rotated about line AB. For the direction angles ?x = 61?, ?y = 66.34? and ?z = 141? for the 27 N force at point D, determine the moment of this force about line AB. Note: for the coordinates of point D given, the top and bottom edges of the tv are not parallel to the x axis.Explanation / Answer
Correct Answer Below:
What we are looking for the moment about the line AB. Therefore we need the moment at A then dot that with the unit vector AB.
So
MomentA = vector(AD) X F(cos of directions given)
This gives moment of A = (-628,-905.37-859.84)
Then we have MomentAB= MomentA
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