Help me it's urgent please the last one is the light will move in some manner not determined by the information here.

The air that we breath is made mostly of which gaseous molecule

Asmall object with mass 0.200 kg swings back and forth on the lower end of a light rope that is 3.00 m long. the upper end of the rope is attached to the ceiling. as the object swings through its lowest position, where the rope is vertical, the speed of the object is 5.80 m/s. at this point in the motion, what is the tension in the rope? (use g = 9.80 m/s2.)

If jerome is swinging on a rope and transferring energy from gravitational potential energy to kinetic energy, is being done.