Dar Step 1: Rinse a penny in tap water and dry completely.
Step 2: Place the penny on paper towel.
Step 3: Use an eyedropper to place drops of WATER on the penny (one at a time) until
ANY amount of water runs over the edge of the penny.
Step 4: Record the number of drops for that trial in the table.
Person:
Trial 1
Trail 2
Trail 3

i think it because equal matrices have equal dimensions, only square matrices can be symmetric. for all indices and . every square diagonal matrix is symmetric, since all off-diagonal elements are zero. in linear algebra, a real symmetric matrix represents a self-adjoint operator over a real inner product space.

.) the observation by semmelweis that more mothers died of childbed fever when their doctors also worked in the morgue

the displacement produced by the body.  

the amount of force subjected to the body.  

the angle between the direction of force and displacement