What is the kinetic energy and velocity of the aluminum sphere in Problem 1.4 at the moment it hits the ground? (Assume that energy is conserved during the fall and that 100% of the sphere's initial potential energy is converted to kinetic energy by the time impact occurs.)
Ch.1 - Introduction: Matter, Energy, and Measurement
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Not the one you use?Change textbook
Chapter 1, Problem 27a
Two positively charged particles are first brought close together and then released. Once released, the repulsion between particles causes them to move away from each other. (a) This is an example of potential energy being converted into what form of energy?
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Identify the type of potential energy involved: Since the particles are charged and initially brought close together, they possess electrostatic potential energy due to their charges.
Understand the conversion of energy: When the particles are released, the electrostatic potential energy is converted into another form of energy as they move apart.
Recognize the force involved: The repulsive electrostatic force between the similarly charged particles causes them to move away from each other.
Determine the form of energy resulting from movement: As the particles move away from each other, their potential energy decreases and is converted into kinetic energy, which is the energy of motion.
Conclude the type of energy conversion: The scenario described is an example of electrostatic potential energy being converted into kinetic energy.

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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Potential Energy
Potential energy is the stored energy in a system due to its position or configuration. In the context of charged particles, potential energy arises from the electrostatic forces between them. When two like-charged particles are brought close together, they possess high potential energy due to their repulsion, which can be converted into kinetic energy when they are released.
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Kinetic Energy
Kinetic energy is the energy of an object in motion. It is directly related to the mass of the object and the square of its velocity, expressed mathematically as KE = 1/2 mv². In the scenario of the charged particles, once they are released, the potential energy they had is transformed into kinetic energy as they accelerate away from each other due to the repulsive force.
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Conservation of Energy
The conservation of energy principle states that energy cannot be created or destroyed, only transformed from one form to another. In this case, the potential energy associated with the electrostatic repulsion between the charged particles is converted into kinetic energy as they move apart. This principle is fundamental in understanding energy transformations in physical systems.
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Related Practice
Textbook Question
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Textbook Question
For each of the following processes, does the potential energy of the object(s) increase or decrease? (b) Water is pumped from ground level to the reservoir of a water tower 30 m above the ground.
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Textbook Question
Two positively charged particles are first brought close together and then released. Once released, the repulsion between particles causes them to move away from each other. (b) Does the potential energy of the two particles prior to release increase or decrease as the distance between them is increased.
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Textbook Question
(a) Calculate the kinetic energy, in joules, of a 15-g bullet moving at 120 m/s.
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