Force System Resultants - General Questions

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Force System Resultants - General Questions

pg4-15 (1)

A twist of 4 N-m is applied to the handle of the screwdriver. Resolve this couple moment into a pair of couple forces F exerted on the handle.

A.	F = 133 N
B.	F = 120 N
C.	F = 60 N
D.	F = 266 N

Answer: Option A

Explanation:

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pg4-21

Replace the force and couple system by an equivalent single force and couple acting at point P.

A.	F = (-8.66i-15.00j) N, M = 50.0 N-m
B.	F = (8.66i-15.00j) N, M = 42.0 N-m
C.	F = (8.66i-15.00j) N, M = 50.0 N-m
D.	F = (-8.66i-15.00j) N, M = 42.0 N-m

Answer: Option B

Explanation:

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pg4-11

Determine the magnitude of the projection of the moment cause by the force about the aa axis.

A.	Maa = 16.97 kN-m
B.	Maa = 12.00 kN-m
C.	Maa = 6 kN-m
D.	Maa = 8.48 kN-m

Answer: Option C

Explanation:

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pg4-28

Replace the two forces acting on the tree branches by an equivalent force and couple moment acting at point O.

A.	R = (60i+198j-36k) N, M = (747i+18j-924k) N-m
B.	R = (60i+18j-324k) N, M = (747i+18j-924k) N-m
C.	R = (60i+198j-36k) N, M = (360i+1260j-414k) N-m
D.	R = (60i+18j-324k) N, M = (360i+1260j-414k) N-m

Answer: Option B

Explanation:

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pg4-35

The distributed loadings of soil pressure on the sides and bottom of a spread footing are shown. Simplify this system to a single resultant force and couple moment acting at A. What is the resultant force F and the couple moment M?

A.	F = (72i + 125j)N, M = 83.5 N-m CCW
B.	F = (144i + 125j)N, M = 135.7 N-m CCW
C.	F = (144i + 125j)N, M = 83.5 N-m CCW
D.	F = (72i + 125j)N, M = 102.1 N-m CCW

Answer: Option D

Explanation:

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pg4-3 (2)

Determine the moment of force F₂ about point A on the beam.

A.	M2 = 800 ft-lb
B.	M2 = 50 ft-lb
C.	M2 = 600 ft-lb
D.	M2 = 37.5 ft-lb

Answer: Option C

Explanation:

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pg4-4

Determine the direction (0° ltet thetaa ltet 180°) of the 30-lb force F so that the moment of F about point A has the maximum magnitude.

A.	= 36.9°
B.	= 53.1°
C.	= 127.0°
D.	= 90.0°

Answer: Option A

Explanation:

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pg4-18

Express the moment of the couple acting on the pipe on Cartesian vector form. What is the magnitude of the couple moment?

A.	Mc = (37.5i-25j) N-m, Mc = 45.1 N-m
B.	Mc = (25i-37.5j) N-m, Mc = 45.1 N-m
C.	Mc =45.1kN-m, Mc = 45.1 N-m
D.	Mc =-45.1kN-m, Mc = 45.1 N-m

Answer: Option A

Explanation:

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Force System Resultants - General Questions

Force System Resultants - General Questions

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