If a 50 kg object is pull 50 N left and 50 N to the right, is it balanced or unbalanced?
1.balanced
2.unbalanced
3.both
4.neither

In raising a 6200-n piano with a pulley system, the movers note that, for every 2.2 m of rope pulled down, the piano rises 0.12 m . ideally, find the force required to lift the piano.

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.

Matter is needed to transfer thermal energy bya. conductionb. convectionc. radiation d. both a & b.