Part B: Completion: Knowledge and Understanding (17) Complete each sentence or statement. 17. In the diagram below, when the system is being pulled to the right, the greatest tension is and the least is T1 T2 "+ 1 2. .. 18. For two given surfaces in contact with one another, the coefficient of kinetic friction is generally than the corresponding coefficient of static friction. 19. 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 20. For a planet orbiting the Sun, the centripetal force is supplied by 21. 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 m/s. 22. law states that the magnitude of the force exerted by an ideal spring is directly proportional to the distance the spring moves from equilibrium. 23. The change in momentum of an object is called the 24. A ball is dropped and bounces back to 90% of its original height. The collision between the ball and the ground was 25. The force of attraction between all objects with mass is called 26. One charge freely moves away from another charge. The force between the two charges changes while the total energy is 27. The bending of a wave due to changing speed is called 28. Energy radiates from an atom in bundles called decay. 29. A decay that involves a high speed electron is a(n) 30. The time required to reduce radioactivity by 50% is the