working science model in science for class 12th

Ernest Rutherford, an energetic New Zealander working in England, was studying the properties of particles spontaneously emitted by radioactive substances. Of particular interest was a positively charged, relatively heavy emission named alpha particle. Quantities of such particles are em..

. In 1793, he left for Manchester to teach physics and chemistry in a college. In 1801, he observed and discovered the law of expansion of gases on heating. He also enunciated the law of partial pressures and found methods of determining vapour pressure of gases. He invented the dew point hygromete..

>The spent slurry is manually removed from the overflow tank and used as manure for plants The gas valve connected to a system of pipelines is opened when a supply of biogas is required To obtain a continuous supply of biogas, a functioning plant can be fed continuously with the prepared slurry Adv..

Work is said to be done when a force acts on an object and the point of application of the force moves in the direction of forc..

Introduction - For a layman the term 'work' implies any activity resulting in muscular or mental exertio..

Wind turbines are used to produce electricity. The machines that generate electricity are the most conventional type with airfoil propeller employing two to three tapered blades. Electricity can be produced by rotating an armature in between the poles of a strong magnet. The shaft of the armature..

Water flowing in high altitude rivers is stored in a man-made reservoir as shown in the figure. The kinetic energy of the flowing water is transformed into potential energy as the water level rises. This water is carried through pipes to the turbine situated at the bottom of the dam. The water ..

The light coming from an object enters the eye through cornea and pupil. The eye lens converges these light rays to form a real, inverted and diminished image on the retina. The light sensitive cells of the retina gets activated with the incidence of light and generate electric signals. These elec..

In many cases when we pull or push an object, we find that force and displacement are not in the same direction. Let a constant force F acting on a body produce a displacement S as shown in the figure. Let q be the angle between the direction of the force and displacemen..

W = F x S SI unit of F is N and that of S is m [N = newto..