Discussion: In this experiment, a spring trigger launches a steel ball, acquiring a certain initial velocity. Then the ball collides with a wooden block, and together they reach a specific angel at height (Δh), called the angle indicator, and a final velocity. Our angle indicator reading was 0 degrees when the pendulum was hanging freely. Because of this, the maximum angel found from the collisions is easier to calculate, since we do not need to subtract the amount the pendulum is off from 0 degrees. After finding the initial estimate of the maximum angle, we loaded the launcher again and set the angle indicator to 3 degrees less than the angle reached in the previous step.
Abstract: In this lab, the purpose was to determine the reaction rate for the absorption (concentration) of the reaction. The components needed for the rate law in this lab are the k value as well as determining if the reaction is zero, first, or second order. The graphical method will be used to determine the order as well as the “K” value. The absorption of the green light increased over time as the reaction occurred. Background: A reaction rate is the decrease in concentration of a reactant or the increase in concentration of a product with time.
A PINHOLE CAMERA A pinhole camera is a camera without a conventional glass lens. An extremely small hole in a very thin material can focus light when all rays from a scene go through a single point. In order to produce a reasonably clear image, the aperture has to be about 1/100th the distance to the screen, or less. The shutter of a pinhole camera usually consists of a hand operated flap of some light-proof material to cover and uncover the pinhole. A common use of a pinhole camera is to capture the movement of sunlight over a long period of time.
This is because there is a relation between the energy of light and its frequency: the greater the energy the higher the frequency. As light travel upwards in the earth´s gravitational fields, it loses energy, and so its frequency goes down. To someone high up, it would appear that everything down below was taking longer to happen. A prediction tested, showed that the clock at the bottom, which was nearer the earth, was found to run slower, in exact agreement with general relativity. The difference in the speed of clocks at different heights is now of considerable practical importance’s, with the advent of very accurate navigation systems bases on signals from satellites (GPS).
Through both qualitative observation, and our quantitative data, we deduced that the shorter the length of a pendulum, the smaller its period. At the longest length 42cm, the period was 1.33s. Each progressing length: 33.5cm, 30cm, 22cm, and 11cm yielded smaller and smaller periods of 1.16s, 1.15s, 0.96s, and 0.68s respectively. In our first graph of Period vs. Length, we plotted the points and discovered that it formed a root curve.
Discussion/ Analysis: Phototaxis was exhibited by the Sow Bugs. This is shown by the higher number of specimen attracted to the darkness versus the lower number of specimen remaining in the light. The results are supportive to the hypothesis where the Sow Bugs exhibited significant phototaxis shown by the change in distance from the stimulus over a period of time. The results of the chemotaxis experiment disprove our hypothesis where the Sow Bugs did exhibit chemotaxis and reacted to the chemical stimulus. There are several factors that could attribute to a data differential throughout the experiment.
In this case, the standard deviation of your range measurements was used as the measure of uncertainty. The variables that contain uncertainty due to human error include: the initial height h (the error was represented by the standard derivation which was 0.0005) and the variance on the final distance calculations (standard derivation are shown in Table I – Exercise 2, 0.4358899, 0.01527525 and so on). As for decimal places causing uncertainty, rounding numbers were also involved in rounding vmin, vmax and v0. As shown in Table II, the measured range is
• What is the mathematical formula that expresses this law? I=1/D^2. I= Intensity of light, D=Distance. Demonstrate the reduction of light intensity with a beginning intensity of 1D at 10 feet from the flash. What is the light density at 14 feet and at 20 feet from the flash?
By default, the ISO is set to Auto which lets it fluctuate between the lowest, and highest setting that the camera is capable of, depending on the amount of available light. ISO determines how much light is captured by your camera’s sensor. Lower ISO is higher quality with less digital noise. Set your camera to capture the most pixels it’s capable of capturing. This won’t matter if you shoot RAW because that setting will always give you the most pixels available.
The theoretical value was .04 kgm^s as opposed to .0488 kgm^2 which yielded a -22% error as shown in the data. Theory: The inertia for the disk rotating on the rotating apparatus can be found by using the integral of mass times the radius which results in the following formula: I(disk) = ½ MR^2 Where M is the mass of the disk being currently in the experiment, and R equal the radius of the disk. Inertia can also be found experimentally, but with the drawback of human and equipment error. I = M((R1)^2 + (R2)^2)/2 Where M is the mass of the object, R is the radius. There are two different radiuses.