In Fig. 7-32, a horizontal force," of magnitude 20.0 N is applied to a 3.00 kg psychology book as the book slides a distance d = 0.500 m up a frictionless ramp at angle () = 30.00 (a) During the displacement, what is the net work done on the book by,", the gravitational force on the book, and the normal force on the book? (b) If the book has zero kinetic energy at the start of the displacement, what is its speed at the end of the displacement?
Motions of the Stars and Sun 1. Constellations and Asterisms a. Constellations: one of 88 sections in the sky i. All countries agree on these regions ii. Utility of these regions is that if there is a particular object, you can get a rough idea of where it is in the sky based on what region it is in b. Asterisms: 2. using asterisms to navigate the sky a. Polaris is the most important star (North Star) b. It is very close to the spin axis, so it doesn’t look like it moves, so people use it as a reference point c. Some other famous constellations are the Big Dipper, the small dipper (the North Star is part of this)
