Lecture4-Force along a line

# Lecture4-Force along a line - APPLICATIONS(continued Given...

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1 APPLICATIONS (continued) Given the forces in the cables, how will you determine the resultant force acting at D, the top of the tower? What are the coordinates of points A, B, and C?

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2 r AB r AB 1. P and Q are two points in a 3-D space. How are the position vectors r PQ and r QP related? A) r PQ = r QP B) r PQ = - r QP C) r PQ = 1/ r QP D) r PQ = 2 r QP 2. Two points in 3 – D space have coordinates of P (1, 2, 3) and Q (4, 5, 6) meters. The position vector r QP is given by A) {3 i + 3 j + 3 k } m B) {- 3 i – 3 j – 3 k } m C) {5 i + 7 j + 9 k } m D) {- 3 i + 3 j + 3 k } m E) {4 i + 5 j + 6 k } m
3 Example 2-12 Determine the magnitude and coordinate direction angles of the position vector directed from A toward B.

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4 4. If F and r are force vector and position vectors, respectively, in SI units, what are the units of the expression ( r × ( F / F )) ? A) Newton B) Dimensionless C) Meter D) Newton - Meter E) The expression is algebraically illegal. 3. Force vector,
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## This note was uploaded on 05/23/2010 for the course PHYSICS PCS211 taught by Professor Juan during the Winter '09 term at Ryerson.

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Lecture4-Force along a line - APPLICATIONS(continued Given...

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