HW11 - Physics2210.Homeworkassignment1 B6.3.3 TwoforcesA=i j2kandB=2ij =j 5k.=A.C B.C=(A B.C=(3i k(j5k)=5 T&M1.1 x3 x3 x2 O O x1 x1 x2 ij = cos xi

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Physics 2210. Homework assignment 1. B6.3.3. Two forces A=i+j- 2 k and B= 2 i-j+ 3 k act on the object and cause displacement C=j- 5 k . The work done by these two forces is W= A . C+B . C = (A+B) . C= (3 i+k ) . ( j- 5 k )=‐5. T&M 1.1. . T&M 1.7. This leads to cos θ =-1/3, or θ =109.5 o . For any other pairs, cos θ is either -1/3 or 1/3, or θ =109.5 o or 70.5 o . x 2 x’ 2 x 3 x 1 x’ 3 x’ 1 O O’ x 2 x 3 x 1 O A B C D E F G The four diagonals are formed with line segments OE, AF, BG, and CD. As a vector, OE = r E - r O =(1,1,1)-(0,0,0)=(1,1,1). Similarly,
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This note was uploaded on 11/10/2009 for the course PHYS 2210 at Colorado.

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