Consider Two Adjacent Water Molecules in an Ice Crystal

question 34

Multiple Choice

Consider two adjacent water molecules in an ice crystal. Assume that the binding energy connecting them follows a Lennard-Jones potential with a potential well depth of 9.6x10-21 J, and the equilibrium atomic spacing is 3.196x10-10 m. One of the molecules is pulled outwards to a position 10% further out than the equilibrium position and then released from rest. What is its initial acceleration? Assume that the other molecule is fixed in position, and that the mass of a water molecule is 2.99x10-26 kg.

• A)2.7x10=15 m s-2.
• B)1.3x10-12 m s-2.
• C)2.7 m s-2.
• D)1.3x1012 m s-2.
• E)2.7x1015 m s-1.

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Definitions:

Raw Material

The basic material from which a product is made, often used in manufacturing and production processes.

Labor Efficiency Variance

The difference between the actual hours of labor worked and the expected (or standard) hours, multiplied by the standard hourly labor rate.

Direct Labor

The cost of wage-earning employees who are directly involved in the production of goods or services, such as assembly line workers.

Direct Labor Rate Variance

The difference between the actual cost of direct labor and the standard cost, demonstrating how actual labor costs differ from budgeted amounts.