Part B: Completion: Knowledge and Understanding (17) Complete each sentence or statement. 18. In the diagram below, when the system is being pulled to the right, the greatest tension is T₁ and the least is T₁₂ T3 19. For two given surfaces in contact with one another, the coefficient of kinetic friction is generally than the corresponding coefficient of static friction. 20. A rock is tied to the end of a string and whirled around in a circle that describes a vertical plane. The position of the stone when the tension in the string is the greatest is_ The position of the stone when the tension in the string is the least is_ 21. For a planet orbiting the Sun, the centripetal force is supplied by_ 22. If Earth's radius and mass were both twice their present values, the acceleration due to gravity at Earth's surface would have a value of 23. m/s². law states that the magnitude of the force exerted by an ideal spring is directly proportional to the distance the spring moves from equilibrium. 24. The change in momentum of an object is called the_ 25. A ball is dropped and bounces back to 90% of its original height. The collision between the ball and the ground was 26. The force of attraction between all objects with mass is called 27. One charge freely moves away from another charge. The force between the two charges changes while the total energy is 28. The bending of a wave due to changing speed is called_ 29. Energy radiates from an atom in bundles called 30. A decay that involves a high speed electron is a(n)_ _decay. 31. The time required to reduce radioactivity by 50% is the_ 5 of 13