Updated: 2010-02-28 19:20:33
1. The problem statement, all variables and given/known data
Calculate the average velocity for a remote controlled vehicle that starts with a speed of 1.0 m/s [forward] and then accelerates at...
Updated: 2010-02-21 07:31:00
: Pages Home About physicsplus The Physics Site for Success In science one tries to tell people , in such a way as to be understood by everyone , something that no one ever knew before . But in poetry , it's the exact opposite Paul A . M . Dirac Sunday , February 21, 2010 Two EAMCET Medical 2009 Questions on Photons and Electrons Today we will discuss two multiple choice questions from modern physics . These questions are from the section electrons and photons’ and they were included in the EAMCET Medical 2009 question : paper 1 In Millikan’s oil drop experiment , a charged oil drop of mass 3.2 10 14 kg is held stationary between two parallel plates 6 mm apart , by applying a potential difference of 1200 V between them . How many electrons does the oil drop carry 1 7 2 8 3 9 4 10 The electric field E’ between the plates is V d where V is the potential difference and d is the separation between the plates . Therefore E 1200 6 10 3 2 10 5 volt per . metre The electric force on the drop is Eq where q’ is the charge on the drop . Since the drop is stationary , the electric force balances the weight mg of the . drop Therefore Eq mg so that q mg E 3.2 10 14 10 2 10 5 1.6 10 18 . coulomb
Updated: 2010-02-19 03:52:35
An international team of scientists has identified a new theoretical approach that may one day make the synthesis of hydrogen fuel storage materials less complicated and improve the thermodynamics and reversibility of the system. A number of scientists have their sights set on hydrogen as an alternative energy source to fossil fuels such as oil, natural gas and coal that contain carbon, pollute the environment and contribute to global warming. Known to be the most abundant element in the universe, hydrogen is considered an ideal energy carrier - not to mention that it's clean, environmentally friendly and non-toxic. However, it has been difficult to find materials that can efficiently and safely store and release it with fast kinetics under ambient temperature and pressure........
Updated: 2010-02-13 20:53:50
Last month I attended the Magnetics 2010 Conference in Florida, where a variety of speakers gave updates on the business and technical side of the magnetics industry. One of these days I’ll actually write up my thoughts on the conference itself, probably in conjunction with my RareMetalBlog parter in crime, Ian London.
In the meantime, however, [...]
Updated: 2010-02-11 03:42:16
In 1984, the magnetic materials research community in Europe was at a formidable crossroads. The latter part of 1983 had seen industrial research groups in the USA and Japan simultaneously announce the discovery of a promising new permanent magnet material, based on the neodymium-iron-boron [Nd-Fe-B] alloy system. This long-sought successor to the ever more expensive [...]
