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a car accelerates due to the force exerted by the engine

option 4

In case of minimum deviation, the angle of refraction is equal to half the angle of prism.

Hence, angle of refraction= 0.5*60°=30°

Thanks brother

The angle of minimum deviation for kerosene oil is 33 degrees

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plucking the rubberband by your hand can produce sound,beating the plate with the use of spoon,playing guitar,when honey bee or any other insect wave thier wings sound produced,take a 4 glass with full of water in it and start beating with spoon in each glass it may produced different sound and don't forget to pour different level of water in all the four glasses then it will make much better sound..........

2)speed = wavelength * frequency

= 65cm * 2KHz

= 0.65m * 2000Hz

= 1300m/sec.

Vpg = 6πηrv = Vpℓg

Vg (p -pℓ) = πηrv

Also Vg (p - pℓ) = 6 πη’rv’

∴ v’η’ = - (p - pℓ)/ (p - pℓ) * vη

v’ = (p - pℓ)/ (p - pℓ) * vη/η’

= (7.8 – 1.2)/(7.8 – 1) * 10 * 8.5 * 10-4/13.2

∴ v’ = 6.25 * 10-4cm/s

thank you so much

given: resistance 24 ohm,potential difference =220 VA. coil of whole wire. p=V²/R =(220)²/24 =201 watts

B. coil of half length wire p=V²/R =(220)²/12 =403 watts

this means that more heat will be obtained after cutting the wire into half

1)Burning ofplasticin the open air, leads to environmentalpollutiondue to the release of poisonous chemicals. Thepollutedair when inhaled by humans and animals affect their health and cancauserespiratory problems.

2)Plastic pollution does not only affect animals that live solely in oceans. Seabirds are also greatly affected. ... Floating plastic debris can produce ulcers, infections and lead to death. Marine plastic pollution can even reach birds that have never been at the sea.

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When the length is tripled then its resistance will also become three times.

Explanation:The resistance of a wire is directly proportional. R ∝ lIf l is tripled, R is also tripled.

If the pieces are of equal length, then you can think of it two ways.

First consider if instead of cutting the wire, you just folded it over on itself. Then the new arrangement would have 1/3 the length and 3 times the cross-sectional area. Resistance is proportional to the length and inversely proportional to the cross-sectional area. Therefore the resistance would be 1/3 of 1/3 of R, which is R/9.

Or do it with the parallel resistance formula. Each piece has an equal amount of the resistance, so R/3.

The formula for resistances in parallel is 1/total = 1/a + 1/b+1/c.

1/(R/3) = 3/R

1/total = 3/R + 3/R + 3/R = 9/R

So total = R/9

Stress = Force / Area of cross section.

Area of cross section depends on square of radius, so the ratio of areas is 4:1

Stress is inversely proportional to area so the ratio of stresses will be 1:4

Decelerationmay also be calculated as change in speed over distance by using the formula final speed squared (sf2) minus initial speed squared (si2) divided by twice the distance (d): (sf2-si2)÷2d=deceleration.

e =1.6 × 10^−19C. Totalchargerequired 1Coulomb.

the number of electrons constituting one coulomb of charge. We know that the a electron have charge of 1.6 × 10^−19C.

When a wave travels in a medium the quantity that is transmitted from one place to the other within the wave is option(d)energy.

Wire A.

Length = l

Radius =r.Area =pie r^2.R1= rho x l /pie r^2.

Wire B.Length = 2l.Radius = 2r.Area = pie 4r^22.R2= rho x 2l/pie 4r2=rho x l /pie x 2r2.

total resistance.1/Rp= 1/R1+1/R2.= pie r2/rho x l+2 pie r2/ rho x l.=3 pie r2/rho x l.

Rp= rho x l/ 3 pie x r2.

ratio = Rp/ R1= rho /3 pie r2divided by rho x l / pie x r2.

Rp / R1= 1 : 3.

Ultraviolet radiation liesbetween visiblelightand X-raysalong the electromagnetic spectrum.UV"light" spans a range of wavelengths between about 10 and 400 nanometers. ... Redlighthas a wavelengthnear650 nm, while the wavelength of bluelight isaround 440 nm.

Let resistance of a conductor =ρL/A

Where ρ is the resistivity of the material, L is the length and A is the cross sectional area.

Let's assume the wire is cylindrical.

Volume of a cylinder = V = πr^2 x h

Where r is the radius and h is the height.

Here, A = πr^2 and h = L

So, V = AL

When you are stretching the volume will remain the same.

So V = A'L' = A'x(1.1)L (stretching by 10%)

Thus A' = V/(1.1L) = 0.909A

So new resistance = ρL'/A' = ρx1.1L/(0.909xA) = 1.21R = 12.1Ω

It is the name of the visible band of light.

answer is 700 because the r is series of the v is not only varification of destances

Resistance of the wire before melting=R

Original length =l

Original area =A

WKT

R=ρl/A

New resistance R'=ρl/'A'

=ρl/2/2A

1/4ρl/A

= 1/4R

R' = R/4

why area is double?

cancelling out I on both the sides,

Req. = R1+ R2+ R3

If copper wire of Resistance R cut into 10 equal part then resistance of one piece is = R/10

Hence,All 1p pieces are connected in parallel hence equivalent resistance 1/R1 = 10(1 / R/10)1/R1 = 100/RR1 = R/100R1 =.01R

(1) is correct option

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Z=6+18(2s)+9(2s)^2=6+36s+9(4s^2)=6+ 36s+36s^2

We know thatformula--divide the mass / volume value by 1000to convert kg/m^3 to gm/cm^3

13600kg/m^3= 13600/1000= 13.6gram/ cubiccmplease like the solution 👍 ✔️

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Difference Between Translucent,Transparent, and Opaque Materials. Light transmission capacity varies fromobjecttoobject.Transparent objectsallow all the light to pass through them,translucentones allow partial light to pass, whereas opaque ones allow no light to pass through.

Let at height h the gravitational acceleration is half of that on earth.

So, we can write:

Gm/(R+h)^2 = Gm/2R^2

or, (R+h)^2=2*R^2

or, R+h= sqrt(2)*R

or, h=(sqrt(2) -1)*R

a:-) balance dietb:-)staple foodc:-)chambrayd:-)lustree:-)evaporation

B) is the correct answer

1. Atoms and molecules2. Solid state3. Decreases4. Minimum5. Condensation

1.molecules or atoms2.solid3.decreases4.least5.Condensation