Category : Physics

The Resultant of Multiple Forces

By: Diane Krehbiel Goal: The goal of this experiment is to use a force table to see the effects of adding vectors. Multiple forces will be attached to a center point. Force components will be added and subtracted both graphically and trigonometrically.   Introduction: Vectors are quantities measured in both magnitude and direction. They are usually represented by an arrow. Two vectors are considered equal despite of the initial points as long as the vectors have the same magnitude and direction […]

Spectra and Molecular Structure – HCl & DCl

Spectra and Molecular Structure – HCl & DCl By: Christopher T. Hales ABSTRACT: FTIR spectroscopy was used to analyze rotational-vibrational transitions in gas-state HCl and DCl and their isotopomers (due to 35Cl and 37Cl) to determine molecular characteristics. Energy transitions from the spectra were plotted vs. frequency, from which several physical constants were determined. These constants were then used to determine the force constants, H35Cl=527667(error) dynes/cm, H37Cl=527781(error) dynes/cm, D35Cl=522901(error) dynes/cm, and D37Cl=521422(error) dynes/cm; and equilibrium bond length, H35Cl=1.274(error)Å, H37Cl=1.275(error)Å, D35Cl=1.201(error)Å, D37Cl=1.202(error)Å. […]

Ohm’s Law and Resistivity

Ohm’s Law and Resistivity By: Alexis Huddleston   Introduction:             The purpose of this experiment was to gain an understanding of Ohm’s law, to experimentally evaluate the validity of the formulas used to determine equivalent resistance, and to find the resistivity of carbon. Ohm’s law, as stated in this activity, is defined as a fundamental rule for analyzing circuits which involve only one voltage, current and resistance in the simplest cases. Interestingly Ohm’s law is named for the relationship between […]

The Effect of Temperature on Voltage in a Galvanic Cell

The Effect of Temperature on Voltage in a Galvanic Cell By: Kaitlyn Barr Aim: To investigate the extent to which temperature affects the voltage in a Daniell cell. Variables Independent Variable: The temperature (˚C) of the cell (0˚C, 3˚C, 15˚C, 22˚C and 34˚C) (measured with a temperature probe) Dependent Variable: The voltage (V) that the cell produces (measured with a voltmeter) Control Variables: Amount of metal used in cell (1.0g copper and 1.0g zinc). The amount of each of the […]

Dynamic Light Scattering: Reverse Micelle Size Dependence on Water Content

By: Scott Holdren Abstract             Dynamic light scattering is used to measure the size of a reverse micelle by determining the diffusion coefficient and average intensity of scattered light of various solutions. These solutions are made using the surfactant Triton X-100 in cyclohexane and varying amounts of water. As more water is added, the size of the reverse micelle increases which increases the scattering of the light from the laser. For the various solutions made, the diameter of the micelle […]

Calibration of Micropipette and Peristaltic Pump

Calibration of Micropipette and Peristaltic Pump By: Andrew Tam Part 1 – Calibration of Micropipette   Results and Discussion: We took a micropipette and pipetted out water of volumes 100, 250, 500, 750, and 1000 uL at specific temperatures (for our experiment, our temperature was 22.9oC) and recorded the mass of the water that was ejected from the micropipette in five trials for each setting. We then convert this value back into uL in order to compare the amount delivered […]