At 1 kilometer per year , how many centuries would it take for people to move from africa to china which is 10,000 kilometers away-

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?

Place me with this question is my last question

Which composition of water moves to begin a deepwater current?