A Van de Graaff generator is a device that accumulates electrons on a large metal sphere until the large amount of charge causes sparks. As youll learn in Chapter 23, the electric field of a charged sphere is exactly the same as if the charge were a point charge at the center of the sphere. Suppose that a 25-cmdiameter sphere has accumulated 1.0 * 1013 extra electrons and that a small ball 50 cm from the edge of the sphere feels the force F u = 19.2 * 10-4 N, away from sphere2. What is the charge on the ball?
Lecture 19 History of Motion Pictures The Business of Blockbusters and High Concept 1. What is a blockbuster a. Film opens in wide release i. On as many screens as possible in as many theaters as possible b. Film has a very large budget i. Now regularly $150+ million ii. The marketing budget is about the same as the production budget c. Ancillary markets are important as well i. Home video (in the 80s/90s-VHS; 2000s-DVD; 2010-Streaming) 2. The Impacts of VHS a. Hollywood hesitant to sell rights for video sales b. Opens up market for competition i. The independent boom just as in theaters in 70s c. Eventually, Hollywood begins selling home videos and became a majority of a film’s business i. The long tail 3. High Concept a. The look b. The hook c. The book
