Why it is difficult to measure the coefficient of volume expansion for a liquid?.

Who was the first scientist to measure speed as distance over time?

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?

Will mark as brainliest how does a catapult increase the trajectory of an object? ps. answer as if u were a 5th grader