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PHYS 170 Past Midterms

PHYS 170 Past Midterms - THE UNryERSITY OF BRITISH COLUMBTA...

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THE UNryERSITY OF BRITISH COLUMBTA 2OO4 I 2OO5 WINTER SES S tON PHYSTCS 179 MEqHAMCS r Midterm Examination 1100 to I150 Friday, February ZS,2005 Write all work to be rna*ed in ttre Ansqrcr Booklets provid. Yotr rnay consuh any nrat rial pu have brouglrt to the oemination romt. Ttre erram omsists of 2 questiors worth a toat of 20 marla. Arcstion I is woflh 7 mads. QueSim 2 is wordr 13 rnad$. QTJESTION I The diagrarn below shows pointsA' B and C on a rigrd body. A force F of magnitude 200 N acb at point A, The coordinate direction angle of F to the positive y-ar<is is 40". The coordinate direction angle of F to the positive z-axis is 70"- The coordinare direction angle of F to the positivex-axis is greater &an 9O"- a) Det rmine the coordinale direction angle of F to the positive x-axis- (l mark) b) Determino the magnitude of the moment of F about an axis extending from B to C. (a marks) c) Express this momont as a Cartesian vector. (2 marks)
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