Which statement about polymers is true?
1.polymers are substances that have relatively large molecules.
2.oil and gas are the starting materials for making all polymers.
3.fabrics such as cotton and silk are synthetic polymers.
4.all polymers are obtained from living organisms.

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.)