r = 7 (cos45i + sin45j) = 4.95i + 4.95j m
v = 5 ( - cos15i - sin15j) = -4.83i - 1.29j m/s
F = 8 (cos75i + sin75j) = 2.07i + 7.73j N
angular momentum =m (v x r)
= 5 [ (-4.83i - 1.29j) x ( 4.95i + 4.95j ) ]
= 5 ( - 17.5)
= -87.6 kg m^2 /s k
Z - component = - 87.6 kg m^2 / s .......Ans
torque = r x F
= (4.95i + 4.95j ) X ( 2.07i + 7.73j)
= 38.26k - 10.25k
= 28 N m ........Ans
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