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August 21, 2014

August 21, 2014

Posted by **COFFEE** on Friday, March 30, 2007 at 4:25am.

(a) What is its angular momentum relative to the origin at this moment?

_____ kg*m^2/s k

(b) What is its angular momentum relative to the point (-2.0, -2.0) m at this same moment?

_____ kg*m^2/s k

---------------

i drew a points on a flat xy plane.. but im not sure if i drew it correctly. i have the Vx component towards the positive X direction and the Vy towards the negative Y direction.

angular momentum = r x p

r x p = m (r x v)

......= 1.1 (r x 30)

......= 1.1r x 30

-33 = 1.1r

-30 = r

.. im stuck.. help!

1. Angular momentum= R x mV Where mV is the linear momentum, x is the cross product, and R is the position vector.

Angular momenum= m(3i-4j)x(30i+90j)

= m270k + m 120k

= m*390 k

check my thinking.

Why did you do the Vy in the negative y direction?

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