What are two ways alternating currents are similiar? 1. in both ac and dc, the flow of electrons changes directions back and forth. 2. both ac and dc involve the flow of electrons. 3. both ac and dc are only possible in certain materials with atoms that will allow electron flow. 4. in both ac and dc electrons flow in the same pattern.

Aprojectile is launched horizontally 10m above the ground and with an initial velocity of 15 m/s. a) sketch the trajectory using an appropriate coordination system. b) how long for the projectile to reach the ground. c) how far did projectile travel horizontally before striking the ground. d) determine the projectilex & y position at t-1.3s e) determine the magnitude and direction of projectile velocity at t= 1.3s f) determine the magnitude and direction of projectile acceleration at t-1.3s

Which statement about covalent bonds is true

Which diagram correctly demonstrates the various forces acting on a ball moving horizontally with some speed?