Which is the best way to determine if an object is made of pure silver

The slope of a velocity time graph over any interval of time gives the during that interval

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?

What can you increase the strength of an electromagnet by