5. Four directions at point Y are indicated as I, II, III, and IV in the figure above. Directions I and III
are vertical, II and IV are horizontal, and I is
directed along the string. Which of the following
best indicates the direction of the acceleration of
the sphere at point Y?

10 newton object is placed 3 meters from the fulcrum. at what distance on the other side would you need to place a 15 newton object to balance the lever? show your work!

Assume that a person skiing high in the mountains at an altitude of h = 15100 ft takes in the same volume of air with each breath as she does while walking at sea level. determine the ratio of the mass of oxygen inhaled for each breath at this high altitude compared to that at sea level. assume that the air composition (i.e. % of air that is oxygen) is the same at sea level as it is at 15100 ft.

Positrons are spontaneously emitted from the nuclei of