Recent content by srivi

if u =1/r2 then F = ( KqQ ) u , which closely resembles the straight line equation y = mx +b. where F represents the "y" values, kqQ is the slope, and u represents the "x" values. In this case, the "b" value (y-intercept) equals zero. so , try substituting u= 1/r2 values...

yes , your are doing correct , the mass of an object can be measured through the specific gravity experiment .

Actually there is no direct relationship between RI and temperature. usaually the RI goes down as temperature rises but the change would be very small. The RI of water changes less than 0.01% per degree celsius.

hi the navigator , Welcome to PF. The energy absorbed by the objects transfers into other forms of energy , for example in photosynthesis process plants abosrbs light energy and prepares their food , here light energy is tranfered to food energy . light energy didn't destroyed but...

The force acting on the water can be calculated F = Apv2 where A- area p-density of water. v- velocity of water.

The molecular structure of liquids and the absence of structural defects are responsible for high optical transparency. As light moves theough the atmosphere it continues to go straight until it bumps into a bit of dust or a gas molecule. then what happens to light depends on its wavelength...

A point charge is an charged entity which occupies a minute point which is an ideal case.For practical purposes we consider it is a tiny charged body and the charge at a single point where all the charge is concentrated . we use point charges in the basic derivations of electrostatic...

There are two forces acting on the rocket , by engine and by gravity. The energy given by gravity is potential energy. So W=dKE+dPE. If you calculate work done by non conservative forces which does not include gravity then you must include the PE term.

The concept of internal resistance applies to all electrical sources. If two cells of equal emf s are connected in parallel then the effective emf is equal to the emf of anyone of the cells. If two cells of different emf are connected in parallel then the effective emf is equal to...

In order to change the momentum of an object the force should be applied to it .The amount of force to be applied depends .It can be -- small force for long time. -- big force for shorter time. The amount of change in the momentum is proportional to the product Force *...

The speed of light is constant in vacuum and it changes in different mediums. when light enters a denser medium (like from air to glass) the speed and wavelength of the light wave decrease while the frequency stays the same. How much light slows down depends on the new medium's...

1) The force acting on a freely falling body is the gravitational force which is equal to mg , which alwyas acts towards earth. This is the only force acts on it unless an external forces are applied. Since the force acting on the dropped object is constant throughout its motion , the...

yes, we can say Potential differencce is cause for the charge but it does not mean that charge is created. when a battery is connected to a circuit , the electrons are produced due to the chemical reactions in the battery .These electrons flow into the capacitor and the voltage...

In a car race two motar vehicles are moving with very high speed , they have collided got coneected each other and started rotating together . Becuase they are in motion according to Newtons first law they are continued with motion, but how did they got rotary motion ?

Hi , I have done my masters in physics with english as main language from an INDIAN university I want to do phd from singapore universities .I have tried calling NUS for months, no response , i even tried going to campus, but no assistance was provided. Can anyone help in finding about...