As an eventful school year draws to a close, Mark has to face his greatest challenge yet. Witches, demons and spells have quickly become the norm for Mark, but he will find that magic can't solve all of his problems. With everyone relying on him, will Mark be able to save the day? Or will the price of being a hero be too high?

This text provides a pedagogical tour through mechanics from Newton to Einstein with detailed explanations and a large number of worked examples. From the very beginning relativity is kept in mind, along with its relation to concepts of basic mechanics, such as inertia, escape velocity, Newton's potential, Kepler motion and curvature. The Lagrange and Hamilton formalisms are treated in detail, and extensive applications to central forces and rigid bodies are presented. After consideration of the motivation of relativity, the essential tensor calculus is developed, and thereafter Einstein's equation is solved for special cases with explicit presentation of calculational steps. The combined treatment of classical mechanics and relativity thus enables the reader to see the connection between Newton's gravitational potential, Kepler motion and Einstein's corrections, as well as diverse aspects of mechanics. The text addresses students and others pursuing a course in classical mechanics, as well as those interested in a detailed course on relativity.

A Seductive Kiss Francis Ray Bestselling author Francis Ray celebrates the lifelong bonds between the Grayson family and their friends—with a heartwarming love story years in the making... Dianna Harrington is known throughout the world as "The Face"—the stunningly beautiful spokesmodel for her family's fashion empire. She could probably have her pick of any man she wants. But Dianna would rather kick back and relax with a good friend— namely Alex Stewart, who she's known, and harbored a crush on, her whole life... Ever since they were kids, Alex has been Dianna's protector and pal, a shoulder to cry on. But as the brother of her best friend, Alex always seemed untouchable. Now a handsome, successful New York lawyer, Alex never realized how lonely Dianna's life has been—or how innocent she is in the ways of love. Alex wants more than anything to reach out to her, to heal her heart. But is his desire worth the risk? After a lifetime of longing building up between them, something's gotta give. Maybe all it takes is just one kiss...

The Grayson Friends Collection Volume 1 bundle contains A Seductive Kiss, With Just One Kiss, and A Dangerous Kiss. Bestselling author Francis Ray celebrates the lifelong bonds between the Grayson family and their friends with heartwarming love stories and happy ever afters... A Seductive Kiss Dianna Harrington is known throughout the world as "The Face"—the stunningly beautiful spokesmodel for her family's fashion empire. She could probably have her pick of any man she wants. But Dianna would rather kick back and relax with a good friend— namely Alex Stewart, who she's known, and harbored a crush on, her whole life... With Just One Kiss Cicely St. John is not impressed by her friend C.J. Callahan's so-called passion in life: running a New York City bar that he inherited from his uncle. So why can't Cicely stop thinking about the dance they shared at their mutual friends' wedding—or the mutual attraction she felt in C.J.'s arms? A Dangerous Kiss Sexy, single sports consultant Payton "Sin" Sinclair has tackled the world's most valuable players—and most eligible women. But ever since his two best friends found love, despite his dangerous secret, he's tempted to take a chance himself. And that temptation is a woman named Summer...

Bestselling author Francis Ray will have fans cheering for the Grayson family's friends—when two perfectly matched opponents go one-on-one... Sexy, single sports consultant Payton "Sin" Sinclair has tackled the world's most valuable players—and most eligible women. But ever since his two best friends found love, despite his dangerous secret, he's tempted to take a chance himself. And that temptation is a woman named Summer... A self-made restaurant owner with a painful past, Summer has always counted on Sin. Beneath his smooth charm—and hard body—lies a tender-hearted friend who always keeps her going when the going gets tough. But now, swept up in her cousin's wedding plans, she's trying not to let the champagne—or Sin's innocent passes—go to her head. Because one dangerous kiss will only lead to another...