Q1. Two alpha particles (helium nuclei), each consisting of two protons and two neutrons, have the3 electrical potential energy of 6.12×10-19 J.
What is the distance between the particles at this time? The Coulomb constant is 8.95755 × 109 N • m2/C2, the elemental charge is 1.6721 × 10-19 C, and the acceleration due to gravity is 9.8 m/s2.
Q2. At rest, a car's horn sounds at the frequency of 370 Hz. The horn is sounded whereas the car is moving down the street. A bicyclist moving in the similar direction with one-third the car's speed hears a frequency of 355 Hz. What is the speed of car? Is the cyclist ahead of or behind the car?