4) For a force vector, the following parameters are randomly generated. The magn

Question

4) For a force vector, the following parameters are randomly generated. The magnitude is 0.9 N, -an', p- 45,-V- 120' What is wrong with this 3-D vector?(scratch row 4) 5) F.-i+2k, and Fami-2-k Determine the direction coordinate of the resultant with respect to Y axis (scratch row 5) 6) See Figure on the right, which of the followings may be true lf -129. y-63. and A) Magnitude is too small, B) All three angles are arbitrarily picked, C) Nothing is wrong D) One of the angles is too large A)135 B)30 C)60 D45* F 400 Ib (Check the all the values in details) (scratch raw 6) A) None of below B) F =400 (costar i. cos1ZFj+ cos63° k) lb C) F 400 (cOs 129 i-cos51 j cos63 k) lb D) F =400 (cos51° i+ cost2ge j+ cos63° kjb 7) Determine the coordinate direction angles of the resultant force in the above question. Which of the following is the correct answer? (scratch row 7 A)", .vn45 o", 150°. 120° C)a, . V = 91 0-150°,105. B) , ,V=240°, 600°. 105° D) , . V = 91 0®, 600°, 120° 8) See figure on the right, Determine the projected component of the force FA 56ON along AC. Express the result as a Cartesian vector. Which of the following is the correct answer? (scratch row 7 a) b) (,-)ac".(%)ac, , (r,"),a=-140,-250, 296 (N) (,-)ac".(r,"),cr. (F4"),c-= 201.. 180, 260(N)

Explanation / Answer

4
(cos a)^2 + (cos b)^2 + (cos y)^2 = 1
here

(cos 30)^2 + (cos 45)^2 + (cos 120)^2 = 3/4 +1/2+1/4 = 3/2 which is not 1

angles are not correct
option B) is most correct

5) F1 = (1,1,2)
F2= (-1,-2,-1)
F1 + F2 = (0,-1,1)
cos b = -1/sqrt(2)
option a) 135 is correct

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