Tuesday, May 5, 2009
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Monday, May 4, 2009
Surface Tension On A Bubble
But the molecules located at the upper most of the liquid are not attracted upward, since there is no liquid molecules above them. Thus they have a resultant of force downward. This force will give a reaction effect upon an external action force though it is small in magnitude.Greater force will break the "binding" and make the force acting on the surface penetrates the liquid.
The bubble is developed because the existence of the surface tension. The outward force from pressure difference between the inside gas and the environment is in equilibrium with the force developed by surface tension.
The force from surface tension is
where gamma is the surface tension, r is the radius of the bubble. Notice that the hemisphere has two surface, the inner and the outer ones.The force caused by pressure difference between the gas inside the bubble and the atmospheric pressure is
The effective area (A) here is the area perpendicular to the force. This hemisphere has the effective area of a circle across it.Equating the equation (1) and (2) we have
Friday, May 1, 2009
Online Education
The up growing demands for health services in all over the world is a good job opportunity for medical assistants. The complexity of the health problems is increase. The need for smart, skillful and well trained medical assistants is inevitable. This is the time for you to increase your skill in medical treatments to serve the patients better.
This formal online tanning programs are available online 24 hours and 7 days a week, you can visit the classes or trainings whenever you want for your convenience. Typical students completed the programs in 6-8 weeks. Accredited, affordable and accessible certificate is available for you upon completing the program. Without time limits applied, you can finish the program as long as you want. But, just keep in mind, the carrier opportunity can't wait. Visit http://www.medassistant.org/program_details.html for the programs offered by this web based medical assistant school.
Enroll to St. Augustine School of Medical Assistants by registering you, you will get your program user name and password. Use them to access all the classes. You can take online examination when you have finished the class. If you pass the exam, the certificate and transcript will be mailed to you.
The programs fee is much less than the regular one. You can visit http://www.medassistant.org to get information about the special fee offered by the school. Learn more about about the good news in http://medicalassistantschools.blogspot.com.
Sunday, April 26, 2009
Optical Instrument, Microscope
A Microscope consists of an objective lens and an ocular lens (eyepiece lens). Both of them are positive lens. The focal length of the objective lens is less than the focal length of the ocular lens. The object is placed a little further than it focus. The final image resulted by the ocular lens is inverted and virtual.
Angle magnification for objective lens
Where :
Mob = angle magnification of objective lens
fob = focal length of the objective lens
S’ob = the distance of objective’s image from the objective lens
Sob = the distance of the objective’s object from the objective lens
Angle magnification for the ocular lens
Angle magnification of the ocular lens similar to that for the magnifying glass. Basically the ocular lens functions just as the magnifying glass.
If the ocular’s image located at the near point then
If the ocular’s image located at the far point (for normal eyes) then
If the ocular’s image located at a distance x between the near point and far point then
The total magnification of the microscope is
The distance of the ocular object in front of the ocular lens is given by
Wherever the ocular’s image located. The length of the microscope cylinder is
