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What is the difference between hand and hand to hand in hand?
I think there is a very subtle difference. hand and hand just refers to two hands not necessarily together. hand in hand implies that the hands are connected or together.
How much force would a biceps muscle inserted 4 cm from the fulcrum need to hold the arm stationary at a 90 percent angle?
Only a very small force if the arm only has to be supported. What other weights do the arm carry and at what angle does the biceps attach to the fore-arm? What is the distance to the hand from the fulcrum and what is the arm weight (assuming a weight is in the hand and arm weight has to be added to the weight-in-hand)? The length of the hand to fulcrum is also required. There is no such thing as 90% angle: 90 degrees perhaps?
What is the difference between internal and external validity?
The difference between internal and external validity is in their nature. Internal validity indicates if a study depicts relation between two variables. External validity on the other hand generalizes the study of the variables.
What is difference between as on and as at?
difference between as on and as at
What is the difference between equilateral and equiangular?
Equilateral deals with equal sides. Equiangular, on the other hand, deals with angles, Equal Angles.
