Vector A is 10 unit longs and points at 25 degree above the positive x axis. Another vector B is 8 units long and points along yhe positive x axis. Determine the magnitude of A X B.

Answer 1

If I'm reading this correctly, the question wants you to find the magnitude of vector A and then multiply it to magnitude of vector B. If that's the case then…

Vector A has both an x and y component:

Fx=10cos25=9.06

Fy=10sin25=4.266

Magnitude of A = sqrt(9.06^2+4.266^2)^(1/2) = 3.16

Vector B only has x components:

Fx=8

Magnitude of B = 8

3.16*8 = 25.28

Answer 2

Sorry, I made an error…

Vector A has both an x and y component:

Fx=10cos25=9.06

Fy=10sin25=4.266

Magnitude of A = sqrt(9.06^2+4.266^2) = 10.0141
Vector B only has x components:

Fx=8

Magnitude of B = 8

10.0141*8 = 80.112