Explore topic-wise InterviewSolutions in .

MB sin theeta= Tauthanks

1/resistivity = density × e^2 × relaxation time/mass

relaxation time = mass/resistivity × density × e^2

= 9.1× 10^-31/1.7× 10^-8 × 8.4× 10^28 × 2.56 × 10^-38

= 9.1× 10^-31/10^-18 × 36.55

= 10^-13 × 0.25

= 2.5 × 10^-14

An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. These biotic and abiotic components are linked together through nutrient cycles and energy flows.

An ecosystem has two basic components i) Abiotic components ii) Biotic components.

Like my answer if you find it useful!

Primitivemeteoritesalso provide clues to the proportions of the elements present in the solar system as a whole.

Meteoritesfrom asteroids and even from other planetshelpscientists understand all planets in our solar system, particularly the processes taking place deep inside.

Theaccelerationwhich is gained by an object becauseof the gravitationalforce is called itsacceleration due to gravity. Its SI unit is m/s^2.Acceleration due to gravityis a vector, whichmeansit has both a magnitude and a direction. Theacceleration due to gravityat the surfaceofEarth is represented as g.

Like if you find it useful

Option (c) is correct.

45ugy8ge8wgfw9y4veozvsyd

Potential difference is the difference in electric potential energy between two points. It is the amount of work done in moving a unit positive charge from one point to another point in an electric field.

This is measured in volt.

An electric potential at a point in an electric field is the work done by the electric field in moving a unit positive charge from infinity to that point.

This is also measured in volt.

N2= 2000I1= 40A

For an ideal transformer

N2/N1 = V2/V1 = I1/I2

so, V2/V1 = 10

and I2/I1 = 1/10

π=180°so angle between a and b is 60°now angle between 2a and -3b would be π-π/3=2π/3so answer is 2π/3=120°

bayya i know the answer if you want it please like it then I will explain it in a best wayplease like my answer

R1 ,R2 ,R3 are in seriesso Rab=R1+R2+R3=5+5+10=20 ohms

We know that

k=1/2mv2

v2 = 2 k/m

v2= 2×60/30

v 2 = 4

v = 2 m/s

Series arrangement is not used for domestic circuits due to following reasons :

(1) In series arrangement same current will flow through all the appliances, which is not required.

(2) Total resistance of domestic circuit will be sum of the resistance of all appliances and hence current drawn by the circuit will be less.

(3) We cannot use independent on/off wsitches with individual appliances.

Thekineticenergyof anobjectincreases with itsspeed.By definition, we say thatthekineticenergyof a body movingwith a certain velocity is equal to thework done on it to make it acquire that velocity.

so Option b is right as it is proportional to R^{n+1/2}

answer to your question is (a)that is alpha,beta than gamma.

(a) .............................

Given :Time period of Simple pendulum =2π(√L/g)where L is the length of pendulumg =acceleration due to gravity.

ΔL/L=y/100ΔT/T=x/100 T=2π(√L/g)

g=4π² (L/T²)

Δg/g =ΔL/L +2Δ T/T

Δg/g=y/100 +2x/100

Δ(g/g)%=2x+y/100 * 100 = 2x+y%

let change in velocity be X ,1/2 mv² =1/2×81m×(Xv)² ,now slove it u will get the ans

Velocity decrease by 9 times.

time period is given by T = 2π√l/gfor finding error in case of g is given byΔg/g = Δl/l + 2ΔT/T ⇒ Δg/g × 100 = Δl/l × 100 + 2 × ΔT/T × 100⇒ % error in g = % error in l + 2 × % error in T⇒ % error in g = 1 % + 2 × 3 % = 1% + 6% = 7%hence the error in measurement of value of g is 7%

About 70 muscles are involved in speaking. These are located in several parts of the head, neck, and mouth.

Thereasonthat theballoonwill sticktothe wallis because the negativechargesin the balloonwill make the electrons in thewallmovetothe other side of their atoms (like chargesrepel) and this leaves the surface of thewallpositivelycharged.

Due to induction, charges opposite to that of the charged body accumulates in some parts of the uncharged object( parts nearer to the charged object ).We know that unlike charges attract each other.So the objects attract.

If the same amounts of negative and positive charge are found in an object, there is no net charge and the object is electrically neutral. If there is more of one type of charge than the other on the object then the object is said to be electrically charged.

the answer is half wave phase rectifier.

Impulse is the change of momentum of an object when the object is acted upon by a force for an interval of time.SI unit is newton second (N⋅s).

Impulse is vector

option B

A unit vector simply denotes the direction. If we have a vector 4i + 3j. I will use a 2D vector because it is easier to understand.a vector which has a magnitude of one.

Anegative vectoris avectorwhich points in the direction opposite to the reference positive direction.

hit like if you find it useful

Stabilizer isthe device used to prevent damage to the electrical appliances and the domestic circuit due to overloading.

CO2 acts on fires in two ways: The release of the gas under pressure has a cooling effect, as can be seen by the resulting mist cloud and ice particles; the gas also displaces the oxygen that's necessary to maintain combustion.

These are the reasons behind the uses of the co2 in fire extinguisher.

But the co2 is not directly used in the extinguisher

In the inner part of the extinguisher, the whole container is filled with the strong solution of sodium carbonate. And there is a glass tube in the bottom of the container contains sulfuric acid. The glass tube is broken with a powerful pressure when required. And the solutions are reacted with each other and carbon dioxide is produced. Then the co2 is released through the tiny hole in a very high pressure and extinguishes the fire.

Na2CO3 + H2SO4 > Na2SO4 + H2O +CO2

But the fire causes by the magnesium can't be extinguished by co2

Because…. when magnesium burns Heavy heat is generated. In the heavy heat the co2 resolved in oxygen and carbon. So in the contact of the oxygen, Magnesium burns even better and instead of extinguishing, the fire increases

Moment = Force ×distance Force=10N Distance= 30 cm = 30/100 = 0.3 m Moment= 10×(0.3) =3 N-m

Time dilationis a difference in the elapsedtimemeasured by two clocks, either due to them having a velocity relative to each other, or by there being a gravitational potential difference between their locations.

T =1/ f,

where T is time period and f is frequency

Average time=Distance/Velocity

They are the inverse of each other.

A time period is the time needed for one complete cycle of vibration to pass a given point.

However, frequency is the number of cycles the vibration completes in one second.

Therefore the relation between, frequency(f) and the time period(T) would be:

T=1/f

When you rub an ebonite rod against a cloth the rod gets negatively charged and the fur gets positively charged. This is because some of the atoms of the ebonite rod is deposited to the cloth. Thus, making it negative and increasing the no. if protons in the cloth.

answer

Loss of biodiversityorbiodiversity lossis theextinctionof species (human, plant or animal) worldwide, and also the local reduction or loss of species in a certainhabitat.

The latter phenomenon can be temporary or permanent, depending on whether theenvironmental degradationthat leads to the loss is reversible throughecological restoration/ecological resilience

There are various factors responsible for the degradation of biodiversity, the primary among them being destruction of habitat and habitat fragmentation leading to species movement to other habitat where they find it difficult to adapt. But it is also being affected by rapid population growth, animal hunting, urbanization, deforestation, industrialization and climatic change. Major reasons of degradation of biodiversity are:Environmental degradation.Excessive use of biodiversity