Homework # 35 - Conservation Of Energy Handout Problems: 1. At what parts of the swing of a pendulum does it have (a) its greatest potential energy; (b) its greatest kinetic energy? (c) How does its greatest potential energy compare with its greatest kinetic energy? (d) How does its total energy at any instant compare with its maximum potential energy? 2. A bullet of given mass is fired vertically upward from a gun and the height to which it rises is determined. How can both the kinetic energy and the velocity with which the bullet leaves the gun be calculated from this information? 3. A 2.0-kg rock falls from a height of 25 m to a point 20 m above the ground. (a) How much potential energy does it lose? (b) How much kinetic energy does it gain? 4. A projectile weighing 25 N is fired directly upward and rises to a height of 400 m. (a) What is its potential energy at the top of its flight? (b) With what kinetic energy does it leave the cannon? (c) What is its kinetic energy at a height of 300 m? 5. A Pendulum has a bob whose mass is 1.0 kg. At either of the highest points of its swing, the bob is 0.10 m higher than it is at the lowest point of its swing. (a) How much more potential energy does the bob have at its highest points than it does at its lowest point? (b) What is the kinetic energy of the bob when it passes through the lowest point of its swing? (c) What is its velocity at that point