Title Experiment with a spiral spring (Oscillation) Objective 1. To show how the time of vertical oscillation depends on the load 2. To determine the spring constant 3. To determine the effective mass of the spring Introduction In this experiment‚ it is to show how the time of vertical oscillation depends on the load‚ to determine the spring constant and to determine the effective mass of the spring. An ideal spring is remarkable in the sense that
Premium Force Elasticity Robert Hooke
Critique of The Hawthorne Experiments Biography Written by Fritz J. Roethlisberger (1898 – 1974)‚ The Hawthorne Experiments‚ explores the experiments‚ results and conclusions of studies performed at the Hawthorne Plant of the Western Electric Company. The Hawthorne Effect is the theory that resulted from the studies. Roethlisberger‚ a key member of the team‚ joined the team in 1927 and actively participated in the research until 1936‚ first as Elton Mayo’s assistant and later as his collaborator
Premium Maslow's hierarchy of needs Motivation
Chem-102 Lab Dr. Sobhi Experiment #3: Spectrophotometric Determination of Tartrazine Purpose The objectives of this lab include- illustrating the use of the spectrophotometer in chemical analysis‚ and generating a standard‚ or calibration curve‚ then using that curve to determine the value of an unknown substance. The spectrophotometer is one of the most powerful tools used in chemistry to find the concentration of substances in solution. It compares the colors of a known and an unknown solution
Premium Chemistry Solution Spectroscopy
to food. Rats were habituated to the new environment for seven days before the test. All experiments were performed in accordance with the guide for the care and use of laboratory animals (IR.SBMU.nrc.REC.1390.20) approved by the Research and Ethics Committee of the Shahid Beheshti University of Medical Sciences. All efforts were made to diminish the number of animals and their suffering during the experiment. 2.4.1. Surgery and microinjection For stereotaxic surgery‚ all the rats were anesthetized
Premium Acetic acid Western blot Swimming pool
In our past experiments and observations we have found that air is in fact matter we know this because air takes up volume and mass. In the beach ball demo‚ we tested the beach ball without air and the mass was 56.1 grams and then we tested it again with air and the mass equalled up to 56.3 grams. This shows us that air takes up space. In the investigation 1.2‚ we tested 3 demonstrations. And in the second demonstration In demonstration 2 the cup was put into the water‚ upside down‚ the beaker
Premium Carbon dioxide Water Oxygen
An Experiment on Soil Analysis Jacob Pitcher and Derrick Gillespie Chemistry Lab 112 Section 02 4/02/2013 Abstract A sample of soil was tested for possible contaminants and other information using a variety of techniques including moisture analysis‚ pH measurement‚ acid-base titration‚ chloride-ion electrode analysis‚ and flame testing. The sample had a greater concentration of chloride ions‚ no measurable CaCo3 ‚ and lower than standard moisture content. It was contaminated with KCl and
Premium Sodium chloride Hydrochloric acid Chlorine
Many people drink sugary drinks every day‚ but really how bad is it for your teeth? This project shows the repercussions of drinking sugary soft drinks. This experiment tests eight adult teeth in eight different soft drinks for 48 hours. The results are equivalent to not brushing your teeth for two days or constantly sipping on a soft drink for more than an hour. If the sugar and acid particles are left on the teeth‚ then more acid is made by the sugar and the enamel starts to wear away. This can
Premium Nutrition Soft drink Sucrose
Cover both of your beakers with plastic wrap so that no air gets in. 7. Let your beaker sit for 5 days. 8. Record your observations Celery Carrots --------------------------------------------------------------------------------------------------------------------
Premium Cell wall Oxygen Seawater
the Perspex on the rectangle. Ensure that it is straight and lines us with your outline and perpendicular to the normal. 7. The laser light should not be refracted; it should be a straight line (you put the laser perpendicular to the Perspex). 8. Now‚ choose an angle of incidence‚ draw the line and put the laser light over it (it must go through the point of intersection between the normal and the Perspex). 9. Now draw a dot where the laser light emerges from the Perspex (as shown in the
Premium Refraction Angle of incidence Total internal reflection
the purer the sample is. Since many compounds have similar melting points‚ a mixed melting point can be taken by mixing samples of the unknown with an authentic sample of the known compound and taken the melting point of the mixture. In this experiment‚ unknown #26 had a melting range of 154°-155°C. After looking at known melting points‚ we expected the unknown to be citric acid. While determining the melting point of the authentic citric acid sample‚ we got a melting range of 153°-160°C. The
Premium Freezing-point depression Melting point Temperature