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How does the size of the bulb in thermometers affect the range and sensitivity of the thermometer?

Do you have an answer? Please feel free to post your answer. We’ll elaborate it after receiving your responses as comments

Be the first to comment - What do you think?  Posted by admin - September 12, 2011 at 10:03 pm

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What is the difference between centre of gravity,centroid and centre of mass ?

Centroid is the geometric centre of a plane figure or object

Centroid divides the shape into regions of equal moments.

 

 

Centre of mass is the mean location of all masses in a system

 

Centre of gravity is the point through which the weight of a body acts.

 

All these will coincide for a plane figure with uniform density and uniform distribution of mass

Be the first to comment - What do you think?  Posted by admin - September 5, 2011 at 9:21 pm

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Where is electricity stored after it is generated but before it is supplied? (Chat Transcript from FaceBook)

Where is electricity stored after it is generated but before it is supplied?
    • Mahesh Sable Electrical power cannot be stored and,therefore,power plants must produce power as and when demanded.power stations r connected in parallel hence load is equally distributed,electric Power can be adjusted with help of step up or step down transformers.

       

    • Mathew Abraham Transformer does not increase power

       

    • Chitraja Rajan The demand for electricity varies randomly within a day itself…so there should be something which should be adjusted according to the demand.

       

    • Vishnu Mohan G huge capacitors? i think i read somewhere like this.

       

    • Rajat Sharma

      Hi All, the question is very smart, i think electricity stored before generation is stored in Water(DAM), Uranium Rods(Nuclear), HydroCarbons(Coal, GAS). Electricity can only store when it is in Direct Current format like in Batteries, Capacitor(its a very small time to store/release) Well there are many source where we can store electricity. When electricity is in demand then Power generation takes place within huge Alternators, this powers generation takes places in terms of Phase Shift between all the power Houses across the country, if this phase shift is disturb then power grid fails. after this the transformers come into picture so as to reduce Resistance loses.

       

    •  

    • Kannan Kannan Ps in my little knowledge electricity unable to store continuing process of generater get current
      >________________________________

       

    • Chitraja Rajan at the generation side electricity is high ac current ..if it is converted into dc then there should be large containers to store them and also need suitable convertors to convert it in either form every time

       

    • Mathew Abraham In modern generators, there are equipment to control the rate of flow of water and in turn rate of rotation as well as the power generated. SO, it is quite right to say that electricity is generated as and when required. When you switch on a device power generation also increases until it reaches maximum capacity. Thereafter we will get less power. Remember the low voltage we suffer during the evening when the power consumption is maximum a few seconds ago · Like

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Be the first to comment - What do you think?  Posted by admin - September 4, 2011 at 7:04 pm

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Vacuum: Challenges and Solutions – Free download from Physics World

Download the free suppliment to Physics WOrld online at the following link. This supplement focusses on the challenges in Vacuum and the solutions.

Click Here to download

The download covers

  • Vacuum Technology : Basis for innovation and Process Optimization
  • Testing Equipment for space
and more articles related to vacuum.

Be the first to comment - What do you think?  Posted by admin - August 10, 2011 at 5:44 am

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Physics Resources

Astrophysics Science Project: Integrating Research and Education (ASPIRE) offers lessons for learning about the atmosphere, force, gas particles, cosmic rays, kinetic energy, lunar phases, machines, momentum, the night sky, refraction demos (prisms and…  (National Science Foundation)
The Physics Front provides selected resources for teachers of high school physics. Hundreds of lessons, labs, and activities can be found in four categories: conceptual physics, algebra-based physics…  (National Science Foundation)

Physical Sciences Resource Center offers hundreds of annotated lessons, simulations, and resources for teaching topics in the physical sciences, including astronomy, classical mechanics, electricity and magnetism…  (National Science Foundation)

The Elegant Universe: It’s String Theory is a 3-hour miniseries exploring one of the most ambitious theories ever proposed: the “theory of everything.” String theory proposes that the fundamental ingredients of nature are…  (WGBH Educational Foundation, supported by Multiple Agencies)
Physics to Go is a collection of reviewed resources for teaching and learning about astronomy, electricity and magnetism, fluids, light, modern physics, motion and energy, quantum physics, and waves…  (American Physical Society, supported by National Science Foundation)

NSTA: Teaching Objects provides web-based science learning activities for teachers. Activities include simulations, questions, and students’ common misconceptions (with practical ideas for addressing them)…  (Multiple Agencies)
Matter provides video lesson, video clips, and interactive resources for learning about air, atoms, atomic basis of the properties of matter, atomic nucleus, chemical change, chemical…  (Teachers’ Domain, supported by Multiple Agencies)
Motions and Forces provides video clips and interactive resources for learning about electricity and magnetism, forces between objects, gravity, objects in motion, tension and compression, and velocity…  (Teachers’ Domain, supported by Multiple Agencies)

Searching for the Building Blocks of Matter looks at Fermilab’s search for the smallest building blocks of matter. It also describes the accelerator and detectors needed for the discovery of these building blocks (quarks…  (Multiple Agencies)
Windows to the Universe explores the Earth, planets of our solar system, and the universe. It includes images, animations, and data sets, and information about books, movies, scientists, and myths…  (National Aeronautics and Space Administration)
Origins lets us look over the shoulders of scientists and glimpse the often-unseen moments of investigation. Take “virtual field trips” to eight observatories — Arecibo, where…  (National Science Foundation)
CERN, the World’s Largest Particle Accelerator features scientists and machines that explore the universe’s tiniest particles. Follow a proton through the accelerator. Meet scientists at CERN. Hear why…  (National Science Foundation)

Project Links provides 7 web-based modules for teaching advanced math methods, probability and statistics, differential equations, discrete mathematics, linear systems, and calculus…  (Rensselaer Polytechnic Institute, supported by National Science Foundation)
National Science Digital Library provides access to resources in science, technology, engineering, and mathematics education and research. From video clips teaching cell division to simulations demonstrating plate…  (National Science Foundation)

The Particle Adventure introduces, through an interactive adventure tour, the theory of fundamental particles and forces. It also looks at why physicists want to go beyond the Standard Model theory. In…  (Multiple Agencies)

From Stargazers to Starships is a self-contained book-on-the-web course on basic astronomy, Newtonian mechanics, the sun (and associated physics), and spaceflight and spacecraft…  (National Aeronautics and Space Administration)
Citizen Kurchatov: Stalin’s Bombmaker tells the story of a complex, world-class physicist who became the driving force the Soviet Union’s race to develop the atomic and hydrogen bomb…  (Oregon Public Broadcasting, supported by National Endowment for the Humanities)
A Science Odyssey highlights some the most spectacular discoveries in science and technology during the 20th century. The site includes an Educator’s Guide with activities, discussion questions, and…  (WGBH, supported by National Science Foundation)
Decades of Discovery describes 100 important discoveries in energy sciences, nuclear and plasma physics, advanced computing research, and biological and environmental research. Topics include the world’s…  (Department of Energy)

MicroWorlds looks at materials sciences research at Berkeley Lab’s Advanced Light Source (ALS). ALS, a facility that produces light one billion times brighter than the sun, offers opportunities…  (Department of Energy)

Physics Education Technology (PhET) produces fun, interactive simulations of physical phenomena. More than 80 simulations let students experiment with circuits, string tension, kinetic and potential energy, radios waves…  (The Kavli Operating Institute, supported by National Science Foundation)

NSF Special Reports presents web-based reports on language and linguistics, Einstein and physics, weather patterns, the chemistry of water, the 2004 tsunami, arctic climate research, Admiral Byrd’s…  (National Science Foundation)

Activity-Based Physics presents “thinking problems” for physics topics: vectors, kinematics, momentum, circular motion, universal gravitation, sound, energy, temperature, and circuits. Problems include…  (University of Maryland Physics Education Research Group, supported by National Science Foundation)

Physics offers a bird’s-eye view of the great challenges in physics today. Read about self-organization, network theory, superconductivity, superfluidity, supersolids, quantum mechanics…  (National Science Foundation)

ComPADRE: Resources for Physics and Astronomy Education provides reviewed collections of resources and interactive learning environments for teaching physics and astronomy. Topics include motion, forces, energy, heat, wave energy…  (National Science Digital Library, supported by National Science Foundation)

Teacher Workshops: Science provides materials from 2007 summer teacher workshops sponsored by the U.S. Department of Education. Find slides and handouts on teaching analogical reasoning, motion and forces…  (Department of Education)

Pedagogy in Action documents more than 25 pedagogic techniques for teaching sciences to undergraduates: case-based learning, game-based learning, making and testing conjectures, peer review…  (SERC, supported by National Science Foundation)

Physics provides more than 40 online interactives that demonstrate concepts in mechanics, fluid mechanics and dynamics, electromagnetism, and quantum physics. Watch simulations of a pendulum…  (Concord Consortium, supported by National Science Foundation)

Einstein’s Big Idea tells the story behind the world’s most famous equation, E = mc2. Learn about its discovery and legacy. Meet scientists whose experiments laid the groundwork. Read about the unknown…  (Public Broadcasting Service, supported by National Science Foundation)

Diagnoser is a web-based program that lets teachers assign questions for students to answer on the web. As students answer questions, they receive feedback. Teachers can see reports on…  (UCLA, supported by National Science Foundation)

Science of Spectroscopy features a wiki-based effort to tell the story of spectroscopy — the use of light to study matter. Find answers to questions about the basic theory of light, energy, and the…  (National Aeronautics and Space Administration)

World Year of Physics 2005 celebrates the centennial of the publication of four strange research papers — written by a 26-year-old patent clerk — that revolutionized how we think about light, matter, energy…  (National Science Foundation)

QuarkNet is the website for a professional development program in which teachers work on particle physics experiments over the summer and join a cadre of scientists and teachers introducing…  (Multiple Agencies)

ABC’s of Nuclear Science introduces the object that contains almost all of the mass in the universe, the atomic nucleus. Antimatter, beta rays, fission and fusion, the structure of the atomic nucleus, how…  (Department of Energy)

Inquiring Minds: Fermilab features an introduction to elementary particles and forces in our universe, physics questions answered by Fermilab scientists, an interactive timeline illustrating the history of…  (Fermi National Accelerator Laboratory, supported by Department of Energy)

Gravity Probe B is a “relativity gyroscope” experiment designed to test two unverified predictions of Albert Einstein’s general theory of relativity (1916): that the presence of a mass in space, such…  (National Aeronautics and Space Administration)

Alsos Digital Library for Nuclear Issues offers annotated references to articles, books, films, and websites for the study of nuclear issues. Topics include fission and fusion, nuclear power and waste, plutonium and tritium…  (Washington and Lee University, supported by National Science Foundation)

Earth’s Magnetic Field is the focus of the POETRY website, which explores solar storms and how they affect us, space weather, and the Northern Lights. A 64-page workbook of hands-on activities examines…  (National Aeronautics and Space Administration)

Magnetic Field Activities for the High School Classroom helps students understand the vector nature of fields, the ubiquity of fields in the environment, and the 3-dimensionality of fields. Activities include mapping the magnetic field of…  (National Aeronautics and Space Administration)

Fundamental Theory provides lessons, video clips, and interactive resources for learning about cosmology and gravity, quantum mechanics, string theory, the special theory of relativity, and Einstein’s…  (Teachers’ Domain, supported by Multiple Agencies)

Fusion: Physics of a Fundamental Energy Source provides introductory educational materials on fusion, the process that powers the sun and other stars; and plasmas, known as the “fourth state of matter.”…  (Department of Energy)

Fermilab Resources for Students offers materials for learning about particle physics and the pursuit of questions such as “What is the smallest piece of matter? How did the universe begin?” It includes streamed…  (Department of Energy)

Center for Science and Engineering Education: Berkeley Lab provides a list of educational links related to science. Nuclear science, engineering, astronomy, genetics, particle physics, periodic table updates, and a virtual frog dissection kit…  (Berkeley Lab, supported by Department of Energy)

NY High School Regents Exam Prep Center helps high school students meet the New York State Regents requirements in mathematics, science, and social studies. The site, developed by a team of Oswego County (NY) teachers…  (NY Regents Exam Prep Center, supported by Department of Education)

The Interactive Plasma Physics Education Experience provides interactive pages for students and educators on matter, electricity, magnetism, energy, and fusion. It features a virtual fusion reactor application and encourages analysis of…  (Department of Energy)

LEGO Design and Programming System introduces a bilingual program that teaches engineering to the K-14 curriculum by combining traditional teaching methodologies with the use of the popular LEGO building blocks and the…  (National Aeronautics and Space Administration)

SLAC Education & Outreach aims to educate a new generation of scientists and to promote science literacy among the general public. The center offers programs for graduates and undergraduates as well as…  (Department of Energy)

Einstein Papers Project provides information about the Einstein Papers Project, which publishes The Collected Papers of Albert Einstein, an edition of 25 planned volumes of Einstein’s scientific, professional…  (California Institute of Technology, supported by National Endowment for the Humanities)

Be the first to comment - What do you think?  Posted by admin - July 26, 2011 at 6:14 pm

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