Physics

When a metal plate with a circular hole at its centre is heated, definitely along with the areal expansion of the plate the diameter of the circular hole also increases. Using the differential equations of coefficients of expansions, we find that the hole radius increases at the same linear rate as the metal.

Rate of change of impulse equals the force . In case of freely falling body the only force is the weight.

Blue + Yellow pigment yields the colour green.

Low temperature and high pressure set of conditions represents the easiest way to liquefy a gas. Liquefaction of gases is physical conversion of a gas into a liquid state (condensation). The processes are used for scientific, industrial and commercial purposes. Many gases can be put into a liquid state at normal atmospheric pressure by simple cooling; a few, such as carbon dioxide, require pressurization as well. Liquefaction is used for analyzing the fundamental properties of gas molecules (intermolecular forces), for storage of gases. The liquefaction of gases is a complicated process that uses various compressions and expansions to achieve high pressures and very low temperatures, using, for example, turbo-expanders.

If the spinning speed of the earth is increased then the weight of body at the equator decreases.

Albedo is a measure of reflectivity._x000D_ This clearly indicates that all black surfaces have the lowest albedo. Fresh snow reflects approximately 95 percent of the sun’s rays so it has the highest albedo.