Physics Final Questions & Answers

Physics Final Questions & Answers A 0.500-kilogram cart traveling to the right on a horizontal, frictionless surface at 2.20 meters per second collides head on with a 0.800-kilogram cart moving to the left at 1.10 meters per second. What is the magnitude of the total momentum of the two-cart system after the collision? - CORRECT ANSWER- 0.22 kg*m/s A 12.0-kilogram cart is moving at a speed of 0.25 meter per second. After the speed of the cart is tripled, the interia of the cart will be - CORRECT ANSWER- unchanged A 2.0-meter length of copper wire is connected across a potential difference of 24 millivolts. The current through the wire is 0.40 ampere. The same copper wire at the same temperature is then connected across a potential difference of 48 millivolts. The current through the wire is - CORRECT ANSWER- 0.80A A 6.0-kilogram cart initially traveling at 4.0 meters per second east accelerates uniformly at 0.50 meter per second squared east for 3.0 seconds. What is the speed of the cart at the end of this 3.0 second interval - CORRECT ANSWER- 5.5 m/s A 7.0-kilogram cart, A, and a 3.0-kilogram cart, B, are initially held together at rest on a horizontal, frictionless surface. When a compressed spring attached to one of the carts is released, the carts are pushed apart. After the spring is released, the speed of cart B is 6.0 meters per second, as represented in the diagram below. What is the speed of cart A after the spring is released? - CORRECT ANSWER- 2.6 m/s