OVIOUS Next Close rrent time: Mon Jan 8, 13:01:40 ext due date: 110% credit:Wed

Question

OVIOUS Next Close rrent time: Mon Jan 8, 13:01:40 ext due date: 110% credit:Wed Jan 10, 2018 23:59 Al dede(s) An object placed in the xy-plane has three equal 1N forces acting on it. The grid spacing is 1 meter and all point coordinates are integers. Use the tail of the vector to determine where the forces are applied. Take CCW positive. NOTES IMAGES DISCUSS EXAMPLES UNITS STATS HELP Part Description Answer Chk History The moment about A is: 1.1 pts, 110%| # tries: 0 1. Positive 2. Negative 3. 0 A. Show Detals % try penalty 1.1 pts, 110%| # tries:0 Show Details 1. Positive 2. Negative 3. 0 B. Hints: 0.0 Which moment has the greater magnitude? 4.4 pts. 110%|# tries: O 1. Moment about A 2. Moment about B 3. Both have the same magnitude C. Show Detais Previous Next here to search

Explanation / Answer

A) The moment about A is positive.

The topmost Fcw effect on moment about A.

The middle and bottom F give ccw moment. The overall moment about A is ccw hence positive.

B)

The moment about B is negative.

The topmost F has cw on moment about B.

The middle and bottom F give cw moment too. Thus the overall moment about B is cw hence negative.

C)

MA = -(F)(1) + (Fcos60) (2) + (F)(2)

= 2F ccw

MB = (F)(4) + (Fcos60) (1) + (F)(1)

= 5.5F cw

Thus, Moment about B has greater magnitude.

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