3221 HOMEWORK 1 – DUE in class 1/23
1. Write down the rotation matrices for
a) a rotation around the x1 axis of 300, where x2 has been rotated towards
x3. Let’s call this λ1
b) a rotation around the x2 axis of 300, where x3 has been rotated towards
x1. Let’s call this λ2
c) Taking a point P(3,2,1) in the unprimed frame, calculate the new
coordinates of the point in a frame that has been rotated first using λ1
and then using λ2
d) Repeat part c) using first λ2 and then using λ1
2. Given the vectors, A=(1,2,3) B=(4,5,6), C=(4,2,1), D=(7,5,4)
Demonstrate the vector identities that are in the book - equations 1.75, 1.76, 1.77,
1.81, 1.82, 1.83, and 1.84 (that is, calculate the left and right side of the equations
to show that they are equal for this one case – in 1.83 and 1.84 just use the final
equation).
