- Please help solve the two problems Thanks...?

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Please help quick? Why is the curl of a vector field F not orthogonal to F? What is the difference in PE between a 82.5 kg adult on a 1.25 m wall, and a 14.7 kg child on the same wall?. Answer=J? How to expect the range of following without graphing :
Sqrt(1-x^2)? If you mixed the genes of a chicken and cow, could you advertise its meat/poultry as natural? Can what we see as mathematics actually always represent reality?