4.4 The beam shown is balanced at its midpoint. The weight of the beam is 40 N. Calculate the unknown force Z, and the length of the beam. ​

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?

Which statements did both aristotle and ptolemy assume? check all that apply.