In the picture below, half of Earth is experiencing day, and half is experiencing night. If the Sun is always giving off light, why do we not all experience day all the time? In your own words, explain why we have a cycle of light and dark that repeats every 24 hours in most parts of the world.

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?

Find the dimensions and area of the largest rectangle that can be inscribed in the upper half of the ellipse. (give your answers in terms of a and b. enter the dimensions as a comma-separated list.)

Which wave would cause destructive interference at every point of the wavelength and completely cancel out the wave?