physics
posted by Joey .
A 1.8 kg particlelike object moves in a plane with velocity components vx = 20 m/s and vy = 50 m/s as it passes through the point with (x, y) coordinates of (3.0, 4.0) m.
(a) What is its angular momentum relative to the origin at this moment?
1 kg · m2/s
(b) What is its angular momentum relative to the point (2.0, 2.0) m at this same moment?
2 kg · m2/s

1(a)
r = (3 4); p = 1.8x(20 30)
r X p = 1.8[ 3x50  (4x20)] = 1.8x(150 + 80)
= 1.8x230 = 414 kg m2/sec
1(b)
r = (3  (2), 4  (2)) = ( 5 2)
similarly
r X p = 522 kg m2/sec