Ch.1 - Intro to General ChemistryWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: Consider the two spheres shown here , one made of silver and the other of aluminum. The spheres are dropped from a height of 2.1 m.Aluminum sphere: Composition = aluminum; Density = 2.70 grams per cubic centimeter; Volume = 196 cubic centimeters. Silver sphere: Composition= silver; Density = 10.49 grams per cubic centimeter; Volume = 196 cubic centimeters.
What is the kinetic energy of the aluminum sphere 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.)

Solution: Consider the two spheres shown here , one made of silver and the other of aluminum. The spheres are dropped from a height of 2.1 m.What is the kinetic energy of the aluminum sphere at the moment it hi

Problem

Consider the two spheres shown here , one made of silver and the other of aluminum. The spheres are dropped from a height of 2.1 m.

Aluminum sphere: Composition = aluminum; Density = 2.70 grams per cubic centimeter; Volume = 196 cubic centimeters. Silver sphere: Composition= silver; Density = 10.49 grams per cubic centimeter; Volume = 196 cubic centimeters.


What is the kinetic energy of the aluminum sphere 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.)

Solution

We are being asked to calculate the kinetic energy of an aluminum sphere at the moment it hits the ground.

The aluminum sphere has an energy E which is the total of its potential and kinetic energy.

Before the aluminum sphere is dropped, all of its energy is potential energy. Potential energy is given by the formula:

Ep = m × g × h

where:

         m is the mass

g is the Earth's gravity (9.81 m/s2)

h is the height

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