Let u and v be vectors and consider the parallelogram that the two vectors make. Note: For i x j the magnitude is 1 and the direction is k, hence i x j = k. A 20 inch wrench is at an angle of 30 degrees with the ground. A force of 40 pounds that makes and angle of 45 degrees with the wrench turns the wrench. Find the torque.
Huperzine A (HUP-er-zeen) is a potent chemical derived from a particular type of club moss (Huperzia serrata [Thumb] Trev.). Like caffeine and cocaine, huperzine A is a medicinally active, plant-derived chemical that belongs to the class known as alkaloids.It was first isolated in 1948 by Chinese scientists.uperzine A (HUP-er-zeen) is a potent chemical derived from a particular type of club moss (Huperzia serrata [Thumb] Trev.). Like caffeine and cocaine, huperzine A is a medicinally active, plant-derived chemical that belongs to the class known as alkaloids.
Children: Huperzine A is POSSIBLY SAFE in children when taken by mouth for a short period of time (less than one month). Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking huperzine A if you are pregnant or breast-feeding. Stay on the safe side and avoid use.hildren: Huperzine A is POSSIBLY SAFE in children when taken by mouth for a short period of time (less than one month). Pregnancy and breast-feeding: There is not enough reliable information about the safety of taking huperzine A if you are pregnant or breast-feeding. Stay on the safe side and avoid use.