Asubstance made of two or more elements is called a what

Your town is considering building a biodiesel power plant describe at least two advantages and two disadvantages

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?

In a good thermo flask the main cause of heat loss is