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Measurement is the assignment of a number to a characteristic of an object or event, which can be compared with other objects or events. The scope and application of measurement are dependent on the context and discipline.

the 1stlaw or thejunction rule: for a given junction or node in a circuit, the sum of the currents entering equals the sum of the currents leaving. This law is a statement of charge conservation.

the 2ndlaw or theloop rule: around any closed loop in a circuit, the sum of the potential differences across all elements is zero. This law is a statement of energy conservation, in that any charge that starts and ends up at the same point with the same velocity must have gained as much energy as it lost

Volume = 4πR³/3

ΔV/V × 100 = 3(∆R / R) × 100= 3 × (1/100) × 100= 3

∴ Percentage error in volume is 3%

where is answer

error in meausrement

The two laws of refraction are:-

1.the normal , incident Ray and refrected Ray lie at same plane.

2.sini/sinr=constantthe ratio of sin of angle of incident with sin of angle of refraction is constant.

1.The angle of incidence is the angle between the incident ray and the normal; denoted as ‘i’. The angle of refraction is the angle between therefracted ray and the normal; denoted as ‘r’. Laws of refraction state that:

The incident ray, reflected ray and the normal, to the interface of any two given mediums; all lie in the same plane.

The ratio of the sine of the angle of incidence and sine of the angle of refraction is constant.

2.Thepowerof alensis defined as the reciprocal of its focal length in meters, or D = 1/f, where D is thepowerin diopters and f is the focal length in meters.

Lens maker formula is the formula for the manufacturer of lenses. Given the specification of the lenses in terms of power (long distance and short distance), they make the lense using the proper combination of glass, with appropriate radii of curvature.

1/f = (μ-1) [1/R1 - 1/R2]

this is the formula, f = focal length, 1/f = power of lens, R1 and R2 are radii of curvature. μ = refractive index of glass used. R1, R2 and f are quantities, positive in the direction of light rays.

A lens formula may be defined as the formula which gives the relationship between the distance of image (v), distance of object (u), and the focal length (f) of the lens. It may be written as: 1/v-1/u=1/f Where, v = Distance of image from optical centre of lens u = Distance of object from optical centre of lens f = Focal length of lens

Q5] Write the answer in one sentence. who is beni

As lemon pickle is an acid and aluminum is a metal and metals react with acids to produce hydrogen gas, it is not advisable to store lemon pickle in an aluminum utensil because it will spoil the pickle and holes will be formed in the vessel.

metals reacts with acids vigorously to form metallic chlorides,which acts as a poison for human body thatswhy lemon being citric acid cant be stored in aluminium utensils

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Advantages of connecting electrical devices in parallel with the battery are as follows:

(1) Voltage across each electrical device is same and the device can take current as per its resistance.

(2) Separate on/off switches can be applied across each device.

(3) Total resistance in parallel circuit decreases, hence, a greater current may be drawn from the cell. ]

(4) If one electrical device is damaged, then other devices continue to work properly.

If the outermost shell of an atom has a total of 8 electrons then the atom is said to have attained a complete octet. An atom has to gain, lose or share a particular number of electrons from its outermost orbit to obtain complete octet. Therefore, a capacity of an atom is the total number of electrons gained, lost, or shared to complete its octet arrangement in the outermost atom. This capacity of an atom will also determine the valency of an atom.

For instance, hydrogen has 1 electron in its outermost orbit so it needs to lose 1 electron to attain stability or octet. Thus, the valency of hydrogen is 1. Similarly, magnesium has 2 electrons in its outermost orbit and it needs to lose them to attain octet and obtain stability. Therefore, the valency of magnesium is 2.

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Ceva's theoremis atheoremabout triangles in plane geometry. Given a triangle ABC, let the lines AO, BO and CO be drawn from the vertices to a common point O (not on one of the sides of ABC), to meet opposite sides at D, E and F respectively. (The segments AD, BE, and CF are known ascevians.)

Ceva's theoremis atheoremabout triangles in plane geometry. Given a triangle ABC, let the lines AO, BO and CO be drawn from the vertices to a common point O (not on one of the sides of ABC), to meet opposite sides at D, E and F respectively. (The segments AD, BE, and CF are known ascevians.)

A●B=ABcost=5A×B=ABsint=5ABsint/ABcost=5/5=1=tantso t=45so angle is 45

The major uses of electroplating is to coat a surface with a thin layer of metal with the help of the electrochemical process. There are wide ranges of applications of this process in the manufacturing industry and various other fields. Below are few mentioned practical applications of electroplating.

Some Uses of Electroplating are listed below:1. Aesthetics2. Commercial applications3. To prevent corrosion4. Conduction of Electricity5. Reduce friction6. To protect from radiation

It will finally reach a stage at which the concentrations of reactants and products remain without any change.

Voltage.............

if i have many resistors connected in parallel and then the voltage will be same. Actually, resistance is the property which basically opposes the flow of current. The higher the resistance of a conductor the less will be the current flowing through it. So if i have different valued resistors connected in parallel then the currents flowing through them will adjust in such a way that the product of R and i remains the same i.e Voltage remains constant.

BaCl2(aq) + Na2SO4⇨ BaSO4(s) + 2NaCl (aq)

In optometry, the least distance of distinct vision or the reference seeing distance is the closest someone with "normal" vision can comfortably look at something.

An isothermal process is a change of a system, in which the temperature remains constant: ΔT = 0. ... In contrast, an adiabatic process is where a system exchanges no heat with its surroundings (Q = 0).

Ans :- Iftwographs xy=a and xy=b aretwographs with a and b astwonon zero constants not equal toeach other, theycanneverintersect each otheras the point ofintersectionwould satisfy bother the graphs but product oftwonumbers(co-ordinates of the point ofintersection) cannot give 2differentanswers (a and b).

Bernoulli’s Theorem States That:

As we move along a streamline, the sum of the pressure (P), the kinetic energy,

the per unit volume (ρ and the potential energy per unit volume (ρgh) remains a

constant.”

• Proof:



*Consider a fluid moving in a pipe if varying cross-sectional area.

*Let the pipe have varying heights & the fluid flowing is incompressible.

*Fluid is initially at E and flows to B. Consider the parts of the tube BC & DE

which are equal in volume, thus having equal volume of fluid.

Distance fluid travels at left end è v2 Δt

Distance fluid travels at right end è v1 Δt

Work done on fluid at left end è W=-F.d è W=-P.A.d è W2= -P2.A2.v2 Δt

Work done on fluid at left end è W=F.d è W=P.A.d è W1=P1.A1.v1 Δt

Ai.Vi Δt = ΔV

W1-W2 = (P1-P2). ΔV (Volumes are same)

Also, W= Kinetic Energy + Potential Energy.

ρ=m/v è m=ρ.v è m=ρ.ΔV

ΔKE of fluid from top to bottom = (1/2).ρ. ΔV(V22-V12)

ΔPE of fluid from top to bottom = ρ. ΔV.g.(h2-h1)

Applying Work-Energy theorem…

ΔW= (1/2).ρ. ΔV(V22-V12) + ρ. ΔV.g.(h2-h1)

Equating Eq.1 & Eq.2

(P1-P2). ΔV = (1/2).ρ. ΔV(V22-V12) + ρ. ΔV.g.(h2-h1)

(P1-P2)= (1/2).ρ.(V22-V12) + ρ.g.(h2-h1)

Re-arranging,

P1 + (1/2).ρ.V12 + ρ.g.(h1) = P2 + (1/2).ρ.V22 + ρ.g.(h2)

--> P + (1/2)ρV2 + ρgh = Constant [Cancelling ΔV

The current is in the east-west direction.

Applying the right-hand thumb rule, we get that the direction of magnetic field at a point below the wire is from north to south.

The direction of magnetic field at a point directly above the wire is from south to north.

The charge on an electron is negative and it is -1.6⨯10-19coulomb therefore, 1 C charge is carried by 1/ (-1.6⨯10-19) = 6.25 ⨯ 1018electrons.

Hence if 1 A current flows through a conductor,

it implies that6.25 ⨯ 1018electrons pass per a second across the cross section of the conductor.

The current is in the east-west direction. Applying the right-hand thumb rule, we get that the direction of magnetic field at a point below the wire is from north to south. The direction of magnetic field at a point directly above the wire is from south to north.

Given-. P1=2D,P2=2.5D ,P3=1.7D

To find- P

Solution- total power of the lens

combination,

P=P1+P2+P3

=2+2.5+1.7

=6.2D

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Liquids and gases are called fluids because they can flow.

Given-. P1=2D,P2=2.5D ,P3=1.7D

To find- P

Solution- total power of the lens

combination,

P=P1+P2+P3

=2+2.5+1.7

=6.2D

Like my answer if you find it useful!

1.6 ×10 to the power-19

A single electron has a charge of 1.60217733 × 10-19 Coulombs. A collection of6.2415×1018 electronshas a charge of one Coulomb (1/1.60217733x10-19). 1.6 into 10 raise to power -19 no of electrons are present in one coulomb of

As the population of a place increases , so does the needs of the people .

More and more supply of water will be needed to fulfill the needs of the increasing population. This will put a lot more pressure on the existing water resources .

Therefore , it will result in a shortage of water supply .

Thebulk modulus( or ) of a substance is a measure of how resistant to compression that substance is. It is defined as the ratio of the infinitesimal pressure increase to the resulting relative decrease of the volume.

The ()Mod()block("mod" is short for "modulo") is an Operatorsblockand a reporterblock. Theblockreports the remainder when the first input is divided by the second. ... For example, -10mod3 = 2, not -1, because the quotient -10/3 is rounded down to -4, giving a positive remainder.

this is the ratio of normal stress to volumetric stress within elastic limit

Ratio of normal stress to the volumetric strain within elastic limit is called BULK MODULUS (B).

B=1/k

k= compressibility

Ratio to normal stress to the volumetric strain within elastic limit is called BULK MODULUS.

denoted by B.

B = 1/kwhere k= compressibility