3. Select the expression that denotes a unit vector in the direction of F1 . a. 0.643i - 0.766 j b. 0.766i - 0.643 j c. -0.766i - 0.643 j d. 0.766i + 0.643 j
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Cartesian Vectors in Two dimensions
3. Select the expression that denotes a unit vector in the direction of F1 .
a. 0.643i - 0.766 j
b. 0.766i - 0.643 j
c. -0.766i - 0.643 j
d. 0.766i + 0.643 j
4. If α = 45ᵒ , determine the magnitude of P that makes the resultant of the three vectors
(R = F1 + F2 + P ) horizontal.
a. 93.9lb
b. 51.5lb
c. 72.7lb
d. 25.8lb
5. Ifα = 45ᵒ , and the resultant (R = F + F + P ) is horizontal,
determine its magnitude, R .
a. 132lb
b. 86.6lb
c. 97.7lb
d. 24.9lb
6. Ifα = 45ᵒ , find the magnitude of the projection of F1 in the
direction of P .
a. 3.24lb
b. 4.49lb
c. 6.97lb
d. 11.2lb
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