## Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (4th Edition)

(a) $A\times B = 17$ (out of the page) (b) $C\times D = 0$
We can use the right-hand rule to determine if the cross-product is into the page or out of the page. (a) $A\times B = A~B~sin(\theta)$ $A\times B = (6)(4)~sin(135^{\circ})$ $A\times B = 17$ (out of the page) (b) $C\times D = C~D~sin(\theta)$ $C\times D = (6)(4)~sin(180^{\circ})$ $C\times D = 0$