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.

An object moves from the position +34m to the position -15m in 15 seconds. what is it's total displacement? what is it's average velocity?

Awoman holds a book by placing it between her hands such that she presses at right angles to the front and back covers. the book has a mass of m = 1.8 kg and the coefficient of static friction between her hand and the book is μs = 0.67. no attempt 50% part (a) what is the weight of the book, fgb in newtons?

How can you increase the strength of an electromagnet?