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Topics: Potential energy, Energy, Kinetic energy Pages: 3 (701 words) Published: May 25, 2013
Problems:|
1. Here is the URL for the Washington Monument. Go to the web site to retrieve the information for part A. A. If 1 meter = 3.28 feet, what is the height of the Washington Monument in meters? 169.30 B. A worker assigned to the restoration of the Washington Monument is checking the condition of the stone at the very top of the monument. A nickel with a mass of 0.005 kg is in her shirt pocket. What is the gravitational potential energy (GPE) of the nickel at the top of the monument? 8.30 J C. What is the kinetic energy (KE) of the nickel in her shirt pocket at the top of the monument?  0 D. If the nickel accidentally falls out of her pocket, what will happen to the gravitational potential energy (GPE) of the nickel as it falls to the ground? It will be converted into kinetic energy E. If the nickel accidentally falls out of her pocket, what will happen to the kinetic energy (KE) of the nickel as it falls to the ground? The kinetic energy of the nickel as it falls to the ground will increase. | 2. Consider the concepts of kinetic energy (KE) and gravitational potential energy (GPE) as you complete these questions. A ball is held 1.4 meters above the floor. Use the terms KE of GPE as your answers. A. When the ball is held motionless above the floor, the ball possesses only gravitational potential energy. B. If the ball is dropped, its gravitational potential energy decreases as it falls. C. If the ball is dropped, its kinetic energy increases as it falls. D. In fact, in the absence of air resistance, the amount of gravitational potential energy when the ball is held motionless above the floor equals the amount of kinetic energy at impact with the floor. | 3. We will now use energy considerations to find the speed of a falling object at impact. Artiom is on the roof replacing some shingles when his 0.55 kg hammer slips out of his hands. The hammer falls 3.67 m to the ground. Neglecting air...