Definition
Gravity Survey - Measurements of the gravitational field at a series of different locations over an area of interest. The objective in exploration work is to associate variations with differences in the distribution of densities and hence rock types. Occasionally the whole gravitational field is measured or derivatives of the gravitational field, but usually the difference between the gravity field at two points is measured Geophysical interpretations from gravity surveys are based on the mutual attraction experienced between two masses* as first expressed by Isaac Newton in his classic work Philosophiae naturalis principa mathematica (The mathematical principles of natural philosophy). Newton's law of gravitation states that the mutual attractive force between two point masses**, m1 and m2, is proportional to one over the square of the distance between them. The constant of proportionality is usually specified as G, the gravitational constant. Thus, we usually see the law of gravitation written as shown to the right where F is the force of attraction, G is the gravitational constant, and r is the distance between

the two masses, m1 and m2.
*As described on the next page, mass
is formally defined as the
proportionality constant relating the force applied to a body and the accleration the body undergoes as given by Newton's second law, usually written as F=ma. Therefore, mass is given as m=F/a and has the units of force over acceleration.

**A point mass specifies a body that has very small physical dimensions. That is, the mass can be considered to be concentrated at a single point.
Gravitational Acceleration
When making measurements of the earth's gravity, we usually don't measure the gravitational force, F. Rather, we measure the gravitational acceleration, g. The gravitational acceleration is the time rate of change of a body's speed under the influence of the gravitational force. That is, if you drop a rock off a cliff, it not only falls,...

...in our everyday lives, we seldom stop to think of what it is that holds us down to this earth; gravity. Whenever I think of gravity, the same questions never fail to come to mind. What exactly is gravity? Could human life possible go on without gravity? How exactly does gravity work in terms of numbers and formulas? How was gravity truly discovered and defined, and by whom? Gravity is universal, and it not affects earth and its inhabitants, but also the entire nebulous of stars and planets.
Gravity is the force that pulls all things toward the center of the earth. Gravity holds your body to the ground, because earth’s mass secrets a pull on your body. There have been many theories as to what gravity truly is. Albert Einstein thought it was what happens when space itself is curved or wrapped around a mass, such as a star or planet. (Laton, 2012) This would explain how everything within that curve falls into that dip. This explanation, though still possessing some lingering questions, is the most accurate and reasonable to date. (Myers, 2011) Gravity holds your body to the ground, because earth’s mass secrets a pull on your body.
Without gravity, human life would obviously be nigh impossible to live. Think about it; we could no longer drive, or run, or even, to some extents, eat. Everything would just...

...Physics 211 Experiment 1: Free Fall - Determining the acceleration of gravity
Prior to Lab: Derive the numbered equations (Equations 1, 2 and 3) in the lab instructions using the definitions of velocity and acceleration (a=dv/dt and v=dy/dt).
Object: The object of this experiment is to determine the value of the acceleration of gravity by measuring the rate of acceleration of a freely falling object. In addition, one will be able to compare theory with experiment for constantly accelerated motion.
Discussion: An object dropped near the earth’s surface will accelerate uniformly with the acceleration due to gravity (g) toward the earth. The magnitude of g at the Berks Campus is 9.801 m/s2. Thus according to the equation describing motion for a uniformly accelerated object, its position y as a function of time t is
[pic] (1)
where down is assumed to be the positive direction and its initial position is at the origin of the coordinate system used. A graph of this equation would yield a parabolic curve as shown in the example below.
The speed can be determined from the equation (1) by differentiating the displacement equation with respect to time yielding
[pic] (2)
which when graphed is the straight line as shown
[pic]
where the y-intercept is the initial speed vo and the slope of the line is the acceleration g.
|[pic]...

...1
Applied geophysics – Introduction
Techniques and targets
Introduction to geophysical methods:
Reference:
Sharma p1-10
Reynolds p1-27
Applied geophysics – Introduction
What do we mean by applied geophysics?
2
Applied geophysics – Introduction
Remote sensing
Constraining the Earth’s sub-surface with
observations at the surface
Geophysical techniques measure physical phenomena:
• Gravity
• Magnetism
• Elastic waves
• Electricity
• Electromagnetic waves
Which are sensitive to sub-surface physical properties:
• Density
• Magnetic susceptibility
• Seismic wave velocity and density
• Resistivity
• Conductance/inductance/permitivity
Oh, and it’s relatively cheap
Applied geophysics – Introduction
Active and passive
Active
Transmit a signal into the subsurface and record what comes back
• Seismic arrival – explosions
• Electrical current
• Electromagnetic waves
Passive
Measure naturally occurring phenomena
• Gravity field
• Magnetic field
• Seismic arrivals - earthquakes
think scale
3
Applied geophysics – Introduction
Our scale …meters to kilometers
The techniques we’ll talk about are used in the fields of
• Environmental geophysics
• Engineering geophysics
• Exploration geophysics
Applied geophysics – Introduction
Planning a survey
4
Applied...

...KEY
KEY
These Physics NOTES belong to
Name ____________________________________ Date __________ Period _____
Unit 5: Circular Motion and the Law of Gravity Ch. 7&8
Skills to Review or Learn:
Memorize/use/convert SI units
Apply Newton’s laws
to circular motion
Dispel myths about circular motion
Skills to Review or Learn:
Memorize/use/convert SI units
Apply Newton’s laws
to circular motion
Dispel myths about circular motion
I am responsible for Vocabulary to know
Centripetal
Tangential
Gravitational
Torque
I am responsible for Vocabulary to know
Centripetal
Tangential
Gravitational
Torque
7.1 ROTATIONAL MOTION
A car is driving at a constant speed of 13.6 m/s (about 30 mph),
moving counter-clockwise on a circular track as shown.
yes
yes
a) Is this car accelerating? ____________
b) If the car suddenly lost all traction and started
skidding exactly when it is at the location, sketch
which direction will it skid (if the driver does nothing).
Change in velocity as time goes by
Change in velocity as time goes by
Review Acceleration:
Magnitude or direction (not units)
Direction only
Magnitude or direction (not units)
Direction only
Acceleration means _______________________________________________
What CAN change for a velocity vector? _____________________________________
What IS changing when...

...Methods of Research
Jennifer Whitehead
CJ490
8/12/14
Professor Price
Methods of Research
Scientist conducts research on a daily basis. The purpose of this research is exploration, description, explanation, and application. In the area of criminal justice things are getting researched all of the time. Take murder for example, the police have to explore to find out what actually happened. They have to describe the events leading up the the murder. They have to explain the facts to try and come up with a suspect. Finally, they have to use the process of application to put it all together so they can make an arrest. When using the different purposes of research it is important to examine each purpose by itself because each purpose has its own different aspect when it comes to research design.
The exploration stage is the first stage that researchers begin with when using research methods. “This stage is typically done for three purposes: to satisfy the researcher does curiosity and desires for better understand, to test the feasibility of undertaking a more extensive study, and to develop the methods to be employed in any subsequent studies.” (Crossman, 2014) A researcher will use the exploration stage of research when they want to find out about something that there is little known about. Take drugs for example; let’s say a researcher wants to find out how bad the drug problem is in the United States. There...

...references to relevant items in the category frame, per chosen unit of content.
- Express the results as an overall distribution of the chosen content sample in terms of the frequency of occurrence of the sought-for referents.
This procedure is based on two main assumptions: first, that the link between the external object of reference and the reference to it in the text will be reasonably clear and unambiguous, and second, that the frequency of occurrence of chosen references will validly express the predominant “meaning” of the text in an objective way. The method produces a statistical summary of a much larger media reality, it has been used especially for comparing media content with a known frequency distribution in “social reality”.
LIMITs 362
ARTHUR ASA BERGER: Media Research Techniques !!!!???? Missing!!!!
“ Media Analysis Techniques
97 C.A. is a standard sociological technique that uses statistical methods to make inferences about what is found in the media (:97).
-Historical frame of ref to make comparisons between earlier samples, is there more or less X? if so, what does it mean?
Topic: the representation of young men in Irish advertising.
The topic only addresses age and gender: young men, it does not specify any research questions or context, which leaves the analyst not being certain about which are the variables or measurable elements of interest (Hornig:87). The field is advertising, regarding representations, no context...

...Assignment in Research Methods
1) Overview of various research methods
When writing a Research Paper it is important to know different research methods. These methods help to gather and systemize the information and data in order to scientifically prove the validity of the work. Further will be explained ways how to collect the data.
Research methods are divided in two big blocks: quantitative and qualitative. Quantitative methods are those where results are explained in numbers, whereas qualitative methods define outcomes by what respondents answer. It is more subjective and more open, as results are not described by numbers, but rather as observations. To put both methods differences together: quantitative look more for statistical explanation, but qualitative are more in-depth. 1 Further will be in more detail explained methods that lay under quantitative and qualitative.
There are many ways how to collect data for the research. One of them is doing experiments. It usually involves small amount of people who are doing some tests, for example, detecting how fast people read, what affects their reading skills and other objectives. This method is very in-depth and counted as qualitative as the behaviour people is investigated in order to conclude some outcomes. One of the minuses of such methods is that it...

...sUnit 3: Concepts
By: Tiffany Linville
Kaplan University
CJ490: Research Methods in Criminal Justice
Professor: Elycia Daniel
3/24/2013
Abstract
Problem statement: Wayne County data indicates that 25% of the population has used illicit drugs at some point in their life (Wayne County, Indiana Strategic Prevention Framework, 2005).
Briefly summarize from at least 4 journal articles, government reports, or databases on your topic. Summarize statistical data where appropriate. Present the important information from each of the sources. (It is not a summary if you simply list what kind of information can be found in the article). What did these data sources and/or information reveal to you? Be sure to support your findings.
Journal Articles, Government Reports, or Databases
The following is a summary of information gathered from various sources regarding drug use in Wayne County, IN.
The report for Wayne County's Strategic Prevention Framework ~ State Incentive Grant is a valuable resource with a great deal of information about drug use in Wayne County. This information is pulled from multiple sources, including surveys of drug use, economic comparisons, different demographic factors, and information regarding school suspension and expulsion rates. Statistics are broken down by age, gender, and other categories (SPF-SIG Local Epidemiological Report - Wayne County, IN).
The Indiana National Prevention Resource Center survey of...