The human head weighs 4.8 kg and its center of mas 1.8 cm in front of the spinal column joint. If the trapezius muscle inserts 1.1 cm behind the spinal cord joint, how much downward force does it need to exert in order to maintain equilibrium

Which material produces static charge when rubbed?

Unpolarized light of intensity so passes through two sheets of polarizing material whose transmission axes make an angle of 60∘ with each other as shown in the figure. what is the intensity of the transmitted beam, st?

What changes occur in the brain during the teenage years? 25 points, someone me out!a.) thinking becomes slower as the brain grows larger. b.) connections between neurons become stronger and faster. c.) unused neurons fuse together to form larger, better functioning neurons. d.) more neurons are developed.