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# Quiz1soln - University of Central Florida EGN 3310...

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Unformatted text preview: University of Central Florida EGN 3310: Engineering Mechanics - Statics Spring 2009 Mackie EGN 3310: ENGINEERING MECHANICS _. STATICS Civil, Environmental, and Construction Engineering Department Name: PID: _~) A g A L . Quiz #1 :4 -' 15,‘ ’ ‘5' J 6:#2; 12' 1. What is not true about a unit vector, “A? (1pt,) a _, f _. (A) It is dimensionless. A’ 3 .- ESLFE) + .30}... i (8 Its magnitude is one. i 5‘ We (as: It always points in the direction of positive X- axis. We. above I} an amp 5 o (D) It always points inthe direction ofvector A. where a dei’thatiud- .3 .I am; flu! ”(5,“ mg not parallel and OFFL'}: m chuck-L, ,4 2. If a dot product of two non-zero vectors equals -1, then the vectors must be to each other. ( lpt.) ' (A) Parallel (pointing in the same direction). (B) Parallel (pointing in the opposite direction). (C) Perpendicular. .3“ m P * ,. gr ,.. m @Cannotbedetennined. fig: 5f.” 43(5) 4 3 (if) .:'W+{Q +9 3. Find the dot product of the two vectorsPand Q. (lpt.) P Q 5 I P={5i+2j+3k}maudQ={-2i+5j+4k}m (A)-12m (B) 12211 ©12m2 (0)42“;2 '(E) 101112 4. The car is towed at constant speed by the 600 lb force and the m 1.. 1h angle 6 is 25°. Find the forces in the ropes AB and AC. The solution must include a free body diagram. (2pts) (.50 WP”)A (finely; 'of gim-l-bnmé' A; i 3? 1:.- Ec 605393 54:92 (03259: O ...
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