Physics 1 Exam Questions & Answers 20 grams of a solid at 70C is placed in 100g of fluid at 20C. Thermal equilibrium is reached at 30C. The specific heat of the solid: - ANSWER: is more than that of the fluid. A 2.0 mol ideal gas system is maintained at a

Physics 1 quiz Questions & Answers A 1000-kg car moving at 10 m/s brakes to a stop in 5 s. The average braking force is - ANSWER: 2000 N. A automobile and a baby carriage traveling at the same speed collide head-on. The impact force is - ANSWER: the same for both. A ball is thrown vertically into the air. Because of air resistance, its speed when it returns to its starting level compared with its initial speed is - ANSWER: Less A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have a kinetic energy that is - ANSWER: 40 J. A bullet is dropped into a river from a very high bridge. At the same time, another bullet is fired from a gun, straight down towards the water. Neglecting air resistance, the acceleration just before striking the water - ANSWER: is the same for each bullet. A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is - ANSWER: Zero A car moving at 50 km/hr skids 20 m with locked brakes. How far will the car skid with locked brakes if it were traveling at 150 km/hr? - ANSWER: 180 m A karate chop delivers a blow of 3000 N to a board that breaks. The force that acts on the hand during this event is - ANSWER: 3000 N A package falls off a truck that is moving at 30 m/s. Neglecting air resistance, the horizontal speed of the package just before it hits the ground is - ANSWER: Zero A rock is thrown upward at 50 degrees with respect to the horizontal. As it rises, neglecting air drag, its vertical component of velocity - ANSWER: Decreases A sandbag is motionless in outer space. A second sandbag with 3 times the mass moving at 12 m/s collides with it. They stick together and move at a speed of - ANSWER: none of these A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that - ANSWER: the milk carton has inertia. A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that - ANSWER: the milk cartoon has inertia A torque acting on an object tends to produce - ANSWER: rotation According to Newton's law of inertia, a railroad train in motion should continue going forever even if its engine is turned off. We never observe this because railroad trains - ANSWER: always have forces that oppose their motion.