In Bosnia, the ultimate test of a young mans courage used to be to jump off a 400-year-old bridge (now destroyed) into the River Neretva, 23 m below the bridge. (a) How long did the jump last? (b) How fast was the jumper traveling upon impact with the river? (c) If the speed of sound in air is 340 m/s, how long after the jumper took off did a spectator on the bridge hear the splash?
Lecture 1: There are 4 fundamental forces in Nature: 1. Gravitational 2. Weak 3. Strong 4. Electromagnetic Electromagnetism is the underlying force behind most observable phenomena Electricity (Lightning, electric current) Magnetism ( Electric Motors, MRI) Radiation (X-rays, Light) Chemistry Electric Charge Electric charges create electric fields Electric fields lead to forces on electric charges Moving electric charges called current create magnetic fields There are two types of charges: Positive and Negative Like charges repel and opposite charges attract Charge is conserved (cannot be created or destroyed) Charge is quantized in units of electron charge
