Sample: I-2B Score: 5 Part (a)(i): 2 points were earned for the correct setup and the correct answer. Part (a)(ii): 1 point was earned. The student makes computational errors that limit the score. Part (b): No points were earned. The setup is nearly correct, but the computation of 10 m3 of infiltration into the surrounding soil should equal 100 m3.
So, 2000 = 30000/Square root of sample size. Solving for the Square root of sample size, we get Square root of sample size = 30000/2000 = 15. Taking its square, the sample size is found as 225. Chapter 9 Exercise 1 No it is not a good defense. If you choose 40 random employees from the corporation, the standard error would equal 6/Square root of 40 = .95 days.
Absorbency of Pollutants in Different Soils Environmental Science Mrs. Gupta Class F December 15, 2007 ABSTRACT The problem that was experimented is “Does the type of soil have a direct effect on the absorbency of liquid pollutants?” This leads to the hypothesis “If the soil has greater porosity (space between the particles), then it will absorb more pollution than a soil that has lesser porosity because it has more space to absorb these pollutants.” The procedure for the experiment is first to gather the necessary soils and pollutants. Then, use a graduated cylinder to measure a precise set amount of solution to run through the soil. Then measure a constant amount of soil to use in the experiment. Next, add the measured amount of soil into a coffee filtered mounted inside of the bottomless cup. After, pour the exact amount of pollutants into the soil in the cup.
As cement usually represent only 10-15 % of a concrete mix (PCA, 2014), energy required to produce concrete isn’t so important. Actually, cement production energy is around 5 GJ/t, but reinforced concrete one is only 2.5 GJ/t (Penttala, 1997). In comparison, steel requires 30 GJ/t, and aluminium 270 GJ/t (Penttala, 1997). But, life-cycle doesn’t take in consideration only the production energy. It should consider energy consumption on all the life duration of the material.
Science Lab Report | Date: November 2,2010 | Period:1 | | 1: The effect of soil type on absorbency 2: The effect of soil type on percolation rate Problem1: What is the effect of soil type on the absorbency of the water? 2: What is the effect of soil type on the percolation rate? Independent Variable1: Soil type 2: Soil type Dependent Variable1: Absorbency 2: Percolation rate Constants: Amount of soil, Amount of water, Same bottle. Hypothesis1: If clay soil is used, then it will absorb the most water. 2: If clay soil is used, then the percolation rate will be the fastest.
A total of 15 oscillations were counted and the time it took to complete those was measured. This was repeated and the average of the two times was taken and divided by the number of oscillations to find the period. The procedure was repeated using masses of 20 g, 30 g, 40 g, 50 g, and 60 g. It was found that as the mass load on the spring increased the period also increased. From the data collected at this point in the experiment, it could be concluded that both period and displacement from the equilibrium position are directly proportional to the mass load on the spring. Following the observation and calculation of the period, the mass load M was plotted against the displacement x with data from the first part of the experiment.
Verify the Gravitational Field Strength Using Ticker Tape Purpose: To verify the known value of Earth’s gravitational field strength by analyzing the acceleration of an object falling under gravity. Hypothesis: If ticker tape with an attached mass is dropped, then dots on the tape will increase further than the last due to gravity and acceleration will amount to 9.8 m/s² (Down). Materials: -Ticker Tape -Masking tape Apparatus: -Ticker timer -Mass (10 oz.) Diagram: Experimental ticker timer set up Safety Considerations: -Notebook placed to cushion landing of mass to not damage or break mass and tabletop Procedure: - Ticker tape, no longer than 50cm, was cut -The ticker timer was taped right side up on the cupboard door using masking tape, then plugged in -The ticker tape was fed through the ticker timer leaving only an inch at the bottom where the mass was attached using masking tape and still held at the top of the tape -A notebook was placed under the mass and the ticker timer was turned on - The tape was released and fell onto the notebook with the mass attached -The ticker timer was turned off and unplugged and data was recorded Observations: Qualitative: -Sets of 2 dots were marked on the ticker tape after it was fed through the ticker timer -Dots got further apart along the tape -The first set of dots were not clear, so the third set of dots were marked as the first set because it was the first clear set Quantitative: Distance versus Time Chart Time (x0.016667 seconds) | Distance (cm [down]) | 1 | 1 | 2 | 2.3 | 3 | 3.8 | 4 | 5.7 | 5 | 7.8 | 6 | 10.1 | 7 | 12.7 | 8 | 15.6 | 9 | 18.7 | 10 | 22.2 | 11 | 25.9 | 12 | 29.8 | 13 | 33.9 | 14 | 38.3 | 15 | 43 | -Distances could be uncertain by measurements of 1mm more or less due to human error Analysis: Graph 1- Distance
The experimental setup consists of two 1HP compressors and two storage tanks of capacity 20 bar. The moisture separator is connected between the compressor and storage tank to remove the moisture from being built up in the storage tanks. An air filter, a pressure regulator, a diffuser, a stagnation chamber and a traverse mechanism with pitot probe were used to regulate the flow and to obtain the total pressure measurements from which velocity and Mach number can be calculated. A 16 channel pressure transducer [NETSCANNERTM 9116] was used to acquire data. The test facility was made to run for 3 min before the test to attain steady condition.
Experiment: Photoelectric Effect Course Name/Section: Physics 222 Section 012 Date: April 12, 2012 Conclusion The slope of the first order stopping potentials was 0.3753 which yielded an h value of 6.0048x10-34Js, which was 9.38% off of the accepted h value of 6.6x10-34Js. The second order stopping potential’s slope was 0.4255. This yielded an h value of 6.808x10-34Js, which was 2.75% off of the accepted h value. There were many sources of error in this experiment. The percent error is much higher for the first order stopping potential than for the second.
Normal rainwater can sometimes be as low as a pH level of 5.0. The issue comes in that the levels in the area of the Adirondack Mountains have levels most commonly between 4.0 and 4.8, sometimes as low as 2.1. Levels this low put aquatic life in sever danger or wipe out all life completely. This was first noticed in the 1800’s. A geologist noticed the gravestones in New York were becoming impossible to read.