Explanation:
if two vectors are perpendicular to each other then thier dot product is equal to zero so (2i+3j+8k).(-4i+4j+ak)=0 (2)(-4) +(3)(4)+(8)(a) =0 -8+12+8a=0 4+8a=0 8a=-4


Answer:
the rock will sink. this is because it is more dense than water
Answer:
<h3><em><u>Magnesium has an atomic number of 12, which means its neutral atom has 12 electrons. The Mg2+ ion is formed when the neutral magnesium atom loses 2 electrons, which brings its total number of electrons to 10</u></em></h3>
Physical anthropology studies the human body. This discipline is aimed at analyzing the evolution and diversity of human beings.
<h3>What is physical anthropology?</h3>
Physical anthropology is a branch of anthropology that studies the evolution and diversity of human beings.
Physical anthropology is also called biological anthropology due to its close relation with biological sciences.
This branch of anthropology (physical anthropology) is aimed at assessing the evolution and physical variation and/or behaviors of human beings.
Learn more about physical anthropology here:
brainly.com/question/8311728