You have learned in biology class that a substance called chlorophyll makes leaves green. you guess that perhaps leaves change color because they do not produce chlorophyll when temperatures get colder. what have you done?

Area around a charged object where the objects can exert a force on another charged objects is an electric

Determine the largest intensity w of the uniform loading that can be applied to the frame without causing either the average normal stress or the average shear stress at section b–b to exceed σ=19 mpa and τ=24 mpa, respectively.

Apropagating wave in space with electric and magnetic components. these components oscillate at right angles to each other. it may travel in a vacuum.