M A [LEI] kg [mg] book is lying flat on the floor. How much work W" is needed to tilt the book upright so that it is standing on its bottom edge? Assume the book is 23 cm tall, 15 cm wide and 3 cm thick. of uniform density, and symmetric. [Hint: where is the center ofmass both before and after it is tilted up' How much work WT would be required to fill a bookcase with ve Sl'lEl't-'ES. where the bottom of the first shelf is 15 cm off the ground and the other four shelves are spaced 25 cm one above the other? Please assume that each shelf holds all] books and that each book stans by lying flat on the floor as in part (a). [f a book falls from the top {fifth} shelf, what will be its kinetic energy Km\" and its speed Fm\" when it hits the floor? Assume the book lands on the floor flat on its cover, not on its bottom or side edges. Draw a sketch for each part of this question for full credit