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Unformatted text preview: STATICS • Force Vectors • (sec 2.1  2.3) Parallelogram law 1) Two forces are to be added to determine the resultant force F r . Compute the angle θ θ = ? One answer only. 120 140 160 None of the above 2) Two forces are to be added to determine the resultant force F r . Compute the angle θ θ = ? One answer only. 30 45 60 None of the above 3) To determine F r shown in the figure, do you use: One answer only. Cosine Law Sine Law Pythagorean theorem None of the above 4) To determine F r shown in the figure, do you use: One answer only. Cosine Law Sine Law Pythagorean theorem None of the above 5) To determine F r shown in the figure, do you use: One answer only. Cosine Law Sine Law Pythagorean theorem None of the above • (sec 2.4) Addition of a system of coplanar forces 1) Select the answer that expresses F as a Cartesian Vector. F = ? One answer only. 100j N 100i N 100j N 100i N None of the above 2) Select the answer that expresses F as a Cartesian Vector. F = ? One answer only. 100j N 100i N 100j N 100i N None of the above 3) Select the answer that expresses F as a Cartesian Vector. F = ? One answer only. (70.7i + 70.7j) N (70.7i  70.7j) N (70.7i + 70.7j) N (100i + 100j) N None of the above 4) Select the answer that expresses F as a Cartesian Vector. F = ? One answer only. (60i + 80j) N (80i  60j) N (80i + 60j) N (80i  60j) N None of the above 5) Calculate the magnitude of F r . F r = ? One answer only. 250 N 500 N 500 N None of the above 6) cont....From qu5, select the equation which is used to determine the direction θ measured counterclockwise from the +x axis. θ = ? One answer only. arctan (300/400) arctan (400/300) arctan (300/400) None of the above • (sec 2.5  2.6) Addition of cartesian vectors 1) Calculate the magnitude of the force. F = (30i  40j) N. F = ? One answer only. 25 N 40 N 50 N None of the above 2) Calculate the magnitude of the force. F = (10i + 20j  20k) N. F = ? One answer only. 25 N 30 N 40 N None of the above 3) If F = (40i  30j) N, select the answer that specifies the cos β . cos β = ? One answer only. 0.6 0.8 0.6 None of the above 4) If F = (100i + 200j  200k) N, select the answer that specifies the cos β . cos β = ? One answer only. 0.667 0.667 0.333 0.333 None of the above 5) Select the answer that gives the y component for the 100N force. F y = ? One answer only. 100sin45sin60 100sin45cos60 100cos45cos60 100cos45/sin60 None of the above 6) Select the answer that gives the y component for the 100N force. F y = ? One answer only. 100sin60 (4/5) 100sin60 (3/5) 100cos60 (3/5) 100cos60 (4/5) None of the above • (sec 2.7  2.8) Cartesian position and force vectors 1) Select the answer that represents the position vector r....
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 Spring '09
 tuken
 Structural Engineering

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