Redicovering the atom, how many pennies For Chemirsty Class Lab Report

Redicovering the atom, how many pennies For Chemirsty Class - Lab Report Example It is done using a beaker of pennies and the main objective is to find the weight of one penny using the Millikan’s experiment. This is done using the principals behind the Millikan’s experiment in which Millikan was able to determine the charge of an electron by using the oil drop experiment. The experiment is to take place inside a lab and various measurements are recorded. After this the data is manipulated using Microsoft spreadsheet to get the overall mass of one penny. This is done in an experiment that looks like a game performed by 15 students. The experiment is similar to the experiment that was done by Millikan to determine the charge of one electron without knowing the number of electrons that were there in the oil drop. This experiment also finds the mass of one penny without knowing the number of pennies in the beaker. This experiment was done by 15 students who volunteered to take part in the experiment. Each student was provided with an empty beaker that was later filled with pennies. A balance is also needed to be used in measuring the weights of the can with the pennies as the experiment goes on. In the experiment, the 15 students each grab a handful of pennies without knowing the total number that they have grabbed. After grabbing the pennies, the mass of the pennies that they grabbed is measured to find the total mass of the handful. Then a table is drawn and the mass of the handful collected by the students are recorded. The masses are arranged from the largest to the smallest. Then subtract each mass from the corresponding greater mass and find the difference. After this get the smallest difference that is close to 2 and not in the range of 0.5, 0.5 and so on. After this make a table of the difference in mass of the pennies and the integers that is found. The gradient of the graph gives the mass of one penny To get the smallest number, the differences with the smallest number greater than 2 is used. Those

Rat trap boat evaluation Essay Example | Topics and Well Written Essays - 1250 words

Rat trap boat evaluation - Essay Example Our initial focus will be to discuss the evaluation plan for the construction of the rat trap boat. The evaluation plan will cover the following areas: background, purpose, limitations, questions, methods, instrumentation, time line, and budget. The assignment for the creation of said rat trap boat was initially given in an Engineering and Construction course. The purpose of this project is to create a moving water vehicle that is powered only by the energy stored in the spring from a mouse trap. The following limitations will be set in place: a standard mousetrap, the spring on the mousetrap will be the sole power source, the spring on the mousetrap will be cut and bent, but no heat-treated or chemically alteration will occur, the maximum length of the boat will be 18’ (this does not include the lever arm), all materials used will be non-hazardous, and the vehicle will be self-starting and steer itself. In an attempt to answer these questions the following methodology will be used to create a rat trap boat. First I will cut the balsa wood into a ten inch by five inch rectangle. Then I will cut one end into a point, making a boat shape. I will then cut a four inch by two and a half inch notch into the other end. Next, I will make four three inch by one and a half inch rectangles out of the balsa wood for paddles. I will then cut the dowel down to six inches. I will then hot glue the paddles to the dowel, making sure they are centered and evenly spaced. I will then allow paddles to cool completely. The next major step will be to wrap wire around the dowel on one side of the paddle and twist with a wire cutter. I will then trim it to about one fourth of an inch to make an axle pin. Now it is time to attach a one inch wire in a loop to one side of the back of the boat shape by hot-gluing one end to the top of the wood and the other to the bottom. I will then slide the end of the dowel through the loop and attach the second one inch wire to the other side, around the dowel. It is now important to place the mousetrap on top of the boat shape on the same side as the axle pin. I will then hot glue the mousetrap in place. Then I will tie string to the axle pin and turn the dowel until I have about two feet of string wrapped around it. I will then tie the end of the string to the â€Å"jaw† of the mousetrap securely. I will then set the trap and tighten the string around the dowel. The final step will be to place the boat into the water and release the trap. The jaw should slowly begin to close, pulling the string and causing