Which of the following creates a  longitudinal wave? a. striking a gong b. turning on a flashlight c. shaking  a rope up and down d. dropping a stone into a pond

5g of ammonium nitrate was dissolved in 60g of water in an insulated container. the temperature at the start of the reaction was 23.0°c and at the end it was 19.0°c. calculate the energy absorbed by the reaction.

Chemical energy is a form of energy. a. heat b. kinetic c. potential d. electromagnetic

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?