Variable Practice Lab

The protein molecules in many foods provide the amino acid building blocks required by our own cells to produce new proteins. To determine whether a sample contains protein, a reagent called Biuret solution is used. Biuret solution contains copper ions. However, the chemical state of the copper ions in Biuret solution causes them to form a chemical complex with the peptide bonds between amino acids (when present), changing the color of the solution. Biuret solution is normally blue, but changes to pink when short peptides are present and to violet when long polypeptides are present.

to undergo a test, even the scenarios are difficult or never happened. Under a controlled condition, the test can be repeated. With the proper way to use the simulator, the cost of the experiment can be greatly reduced.

The subjects were given mimeographed answer forms that were assumed to match the ones in front of the test takers. The subjects answer forms contained the correct answers so that they could keep track of the test takers scores. There were two tasks consisting of twenty-five questions each. The first consisted of household objects and was female oriented. The second consisted of mechanical objects and was male oriented. There was only one task completed during each experimental session chosen by the experimenter. The instructions given to each subject emphasized that a person’s performance is influenced by factors such as luck, ability, and effort. These factors were told to be kept in mind as well as the tone and hesitation in the test takers voice.

The last week of with the lab assignment I see this tool can really save some time in completing job but can easily destroy them if you’re not careful. Also, when it comes to work to precision work like honing and polishing a trigger and sear. Hand files and honing stones should always be used. My first concern was the safety portion of the job. You’re talking about a tool that move at high and low speeds, so I would defiantly wear eye protection. Have a good grip of the tool and to keep your free hand a safe distance away from the rotating bit. I would also be sure do not wear loose clothing or jewelry that can become entangled with the rotary tool. A dust mask is also recommended. At 28,000 rpm, the rotary tool will create a lot of dust.

A controlled group is one of the best ways to gather all needed information for the objectivity of the test. The experimental group is controlled by who is chosen to conduct the test, where the test will be conducted, how the test will be conducted (controlled environment), and a period of time (how long will be given) to complete the test. Both of the controlled groups will have the same number 2 pencils, comfortable room, and temperature of the room will be the same between both groups. Keeping both group A and group B exactly the same in every aspect during the test will determine the accuracy of the

In this lab, the possibility of experiencing sources of was extremely high as pushing a car and calculating the acceleration easily invited interference in otherwise perfect results. It can be proven that there were multiple sources of error by the slope of the equation on the ‘Force vs. Acceleration’ group for this lab. While the slope of the linear trend line was 4084.798, the actual mass of the van and Mr. Simmons combined was 2450 kg. These sources of error include human error such as not keeping the acceleration constant, changing the force placed on the van, and by starting or stopping the timer late. In our lab, some pairs would start and stop in order to remain at the correct number of pounds on the vehicle; therefore, the car had inconsistent acceleration and the data did not accurately reflect the constant rate.

1. Research to find equations that would help you find g using a pendulum. Design an experiment and test your design using Moon and Jupiter. Write your procedure in a paragraph that another student could use to verify your results. Show your data, graphs, and calculations that support your strategy.

The first part of the lab was the Block Practicing. In this portion my partner was the participant. The task was to trace a template on a piece of paper with your index finger with donimante hand. Their were three different blocks of practice. During the first block my partner had to trace the template in 1.50 second for 18 times in a row. After each attempt I was allowed to give her feedback e.g. that was too slow, or a little faster next time, with a One minute break in-between each practice block. In the second one, now the participant had to trace the template in 2.50 second, still being able to

Introduction Free fall, which is accelerated motion that happens when an object falls with only the force of gravity acting on it (Hsu, Tom, Dr.). The speed of the tennis ball in y-direction will become 0m/s when the ball reaches to the peak and the acceleration will be 9.8m/s^2. Therefore, in order to find out the percent error for the time and eventually to predict the relationship between rolling speed and falling time, we can do this by using the equation: "y=vot+" 1/2 at^2, where y stands for the height of the table (0.865m), "vo" stands for the initial speed of the ball (0m/s), t stands for the time (from the app) and a stands for the acceleration (9.8 m/s2). The equation percent error=|theoretical-├ experimental┤|┤/theoretical is

Friction is the resistance to motion of one object moving relative to another and it is created when two surfaces move or attempt to move across each other. Friction is a non-conservative force, which is defined as a force that does not store energy. The fact that friction is a non-conservative force means that the kinetic energy involved in friction is transferred into thermal energy (heat). One of the method is using a spring balance which was used in the actual lab and is done by pulling a spring balance connected to a block and slowly increase the force until the block begins to slide. The other method that was used in this lab used a tilted plane. In this method, a block was placed on the plane and then the angle of the plane was

The experimental design below was used to determine if an increase in scores between the two related groups” before training/ after training” increased or decreased.

1. Develop hypotheses predicting the effect of pyrite and coal on the acidity of water?

The study was conducted in 1957, where 71 male students from Standford University were in the experiment. They were told they had to be in the study and that it was the help them improve experiments in the future. They were also told that a sample of the students would be interviewed after they had completed the experiment. Each subject was urged to be completely honest beforehand. Each subject was brought into a room to wait, the secretary office, then after a few minutes they would be taken to the experiment room. Once there, they were given two different tasks to do for thirty minutes a piece. First, they would be asked to put 12 spools onto a tray, empty, then refill for the first thirty minutes. During this time, the person conducting the experiment would jot down information on paper. Then they were asked to do another task for 30 minutes which included 48 square

The objective of this lab was to determine how the acceleration of a system is related to the force applied. In order to complete this experiment we had to establish our hypothesis, independent and dependent variables and the control variables. We conducted two trials with the same masses for both trials, and changed the masses from 10 g all the way to 40 g in intervals of 5. We made sure to keep the overall weight of the system constant, since it was a control variable. We had to account for the friction of the system and developed a graph and error bars. At the end of this experiment we determined that our prediction was correct: the more force applied, the faster the acceleration.

This could be prevented if the person who is counting the oscillations also times them themselves.