Question

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Qia) The work done on an object whose displacement vector is s =< 3, -4,0 > by a force f =< 3, -2,1 > is: a. 5+ V14 b. 17 c. None of the above. Qib) The cross product of a =< 1,2,3,4 > and b =< 4, -3, -2,2 > is: d. <4, -6, -6,8 > e. O f. None of the above. QIC) The position vector OP =< 3, -4,6 > describes the location of an aero plane relative to its point of origin. The scalar projection of the position vector Op onto the ground is? g. -1 h. i. None of the above, Qid) If the matrix D has 2 rows and 3 columns then D j. Has 2 rows and 3 columns k. Has 2 rows and 2 columns I. Does Not Exist

Answer 1

1. ne The work done on an object whose displacement vector is s=(3,-4, o) by a force f = <3, -2, 1) is a) 5 * Via b> 17 c) None of the above As we know, Work = (force) * ( displacement) & W = f*s = <3, 4, o), <3, 2, 1) (dot product) = 3x3+ (-4) (-2) + oxy = 9+8+o = 17 . The work done is 17