Q1) Define:-
a) Energy
b) Combustion
c) Density
d) Buoyancy
e) Relative Density
Q2) What are the different forms of Energy?
Q3) Write the formula for:-
a) Density
b) Pressure
c) Relative Density
Answers
Answer:
energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object.[note 1] Energy is a conserved quantity; the law of conservation of energy states that energy can be converted in form, but not created or destroyed. The SI unit of energy is the joule, which is the energy transferred to an object by the work of moving it a distance of 1 metre against a force of 1 newton.
Combustion, or burning, is a high-temperature exothermic redox chemical reaction between a fuel (the reductant) and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
The density (more precisely, the volumetric mass density; also known as specific mass), of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume
Buoyancy or upthrust, is an upward force exerted by a fluid that opposes the weight of an immersed object. In a column of fluid, pressure increases with depth as a result of the weight of the overlying fluid. Thus the pressure at the bottom of a column of fluid is greater than at the top of the column.
Relative density, or specific gravity, is the ratio of the density (mass of a unit volume) of a substance to the density of a given reference material. Specific gravity usually means relative density with respect to water. ... For example, an ice cube, with a relative density of about 0.91, will float.
Answer:
Q1)a) The ability to do work is known as Energy.
b) rapid chemical combination of a substance with oxygen, involving the production of heat and light is known as Combustion.
c) The mass of the substance per unit volume ia called Density.
d) The tendency of a liquid exert an upward force on an object placed in it is known as Buoyancy.
e) The ratio of mass of any volume of the substance to the mass of an equal volume of water is known as Relative Density.
A2) DIFFERENT FORMS OF ENERY ARE:-
1. KINETIC ENERGY.
2. POTENTIAL ENERGY.
3. CHEMICAL ENERGY.
4. HEAR ENERGY.
5. LIGHT ENERGY.
6. SOUND ENERGY.
7. ELECTRICAL ENERGY.
8. NUCLEAR ENERGY.
A3)a) Density=Mass/Volume
b) Pressure = Force/Area
c) Relative Density=
Density of substance/Density of water.
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