ENGR 8
Assignment 1
Due: next wed
C level Drills, 1 pt each:
1) Solve for the unknowns using the law of sines or cosines:
a)
b)
2) Determine the magnitude of the resultant
and it’s direction relative to the x-axis
4) Find the magnitude and direction of the vector F = 310 i - 760 j
B Level Problems, 2 pts each (turn over)
PLAN:
a) we need to find vectors along the u and v axes that
when added sum to F2
b) Starting at the arrowhead of F2,
sketch a line parallel to the v axis towards u axis
c) Starting at the arrowhead of F2,
sketch a line parallel to the u axis towards –v axis
this is the parallelogram law in reverse
d) determine the angles within the one of the triangles
of the parallelogram and solve for the magnitude of
the u and v components
PLAN:
a) convert each vector into Cartesian form
b) add up all the Fx components
c) add up all the Fy components
d) this defines the resultant. Now find the magnitude
and direction using the standard formulas.
A Level Problems, 2 pts each
8) For problem 7, determine the magnitude and
direction of F1 so that the resultant force is directed
upward and has a magnitude of 800 N