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ans is (A) Yantra swatantra

Hence, option (a) is correct.

thanks bro

Answer:If the elevator was not moving the force applied by the block A on the block B would have been equal to its weight = mg = 0.5 kg x 9.8 m/s²= 4.9 N. But in this case the elevator is descending with an acceleration of a=2 m/s². So in order to apply the Newton's Laws of motion with respect to the elevator we apply a pseudo force equal to ma on the block A in the direction opposite to the acceleration ie upwards. The net force on the block is

= mg-ma= 4.9 - 0.5x2 = 4.9-1 = 3.9 N ≈ 4.0 N

number of electrons=current/charge of one electron=5/(1.59×10^(-19))=3.125×10^19

dm/dt*V = m*a

=> dm/dt = 1000*5/1000 = 5kg/s

i=2A he apne 1A likha he or answer bhi galat he

If in a givenradioactive element, half of itselementshave decayed after one halflife, some well-definedaverage lifeexpectancy can be assumed which is themean lifeof the atoms.

work done = mgh = 10*9.8*1 =98J

We know that,

Tension= mv²/r-mg

Tension= 1×(16/1)-1×(1×10)

Tension= 6N

The answer is option (a)

Sorry, but the answer is 66 N

thanks allot sir

Let θ be the angle betweenf1andf2

(Quantities in bold represents vectors)

Given,

f1+f2=r1----- 1

f1+ 2f2=r2 ----2

Taking dot product on itself of eqn. 1

r1. r1=f1.f1+f1.f2+f2.f1+f2.f2

=> r12= f12+ f22+ 2f1f2cosθ ---3.

Taking dot product off1with eqn. 2

f1.(f1+ 2f2)=f1.r2

Since,f1andr2are perpendicular to each otherf1.r2= 0

=> f12+ 2f1f2cosθ = 0 ---4.

By eqn. 3 and 4.

r12= (f12+ 2f1f2cosθ) + f22

=> r12= 0 + f22

=> r1= f2

QED.

If the chain is held vertically downward two forces will be acting along the surface of chainone of them is the mass of the chain that is mg acting vertically downward and other is the tension of chain acting vertically upward and canceling the effect of mass pulling it downwardsince acceleration is zero soF(net)=0so mass of chain is m=(L-x)T=mgm=(L-x)/L*mT=(L-x)/LM*g

The colour of the clear sky is blue because molecules in the air scatter bluelightfrom the sun more than they scatterred light. When we look towards the sun at sunset, we seeredandorangecolours because the blue lighthas been scattered out and away from the line of sight.

The primary reason why the colorredis used fordanger signalsis thatredlight is scattered the least by air molecules.

The effect of scattering is inversely related to the fourth power of the wavelength of a color.

Soredlight is able to travel the longest distance through fog, rain, and the alike.

It is equal to feraanti voltage asat receiving end voltage is higher due to feraanti effect.

TLV measure the quality

Sound funnels into the ear canal and causes the eardrum to move. Sound vibrations move through the ossicles to the cochlea. Sound vibrations cause the fluid in the cochlea to move. ... The auditory nerve sends signals to the brain where they are interpreted as sounds.1]Sound funnels into the ear canal and causes the eardrum to move.2]The eardrum vibrates with sound.3]Sound vibrations move through the ossicles to the cochlea.4]Sound vibrations cause the fluid in the cochlea to move.5]Fluid movement causes the hair cells to bend. Hair cells create neural signals which are picked up by the auditory nerve. Hair cells at one end of the cochlea send low pitch sound information and hair cells at the other end send high pitch sound information.6]The auditory nerve sends signals to the brain where they are interpreted as sounds.

F=ma =>

That is your magnitude my dear friend. But acceleration is a vector, (x,y,z) direction.

If you have a space between the blocks and then contact is made, then you're dealing with momentum.

p=mv. So, that is then p=m((v-u)/t).

Quality is not a characteristic of sound.

Frequency , pitch and loudness is the characteristics of sound.

Here, original length, L = 3.0 mStrain =∆L/L = 0.015% = 0.015/100

∆L = Strain x L

or ∆L = extension = 0.015 / 100 x L= 0.015 x 3.0/100 = 0.00045m

thanks

When you bump one end of a long metal bar, the other end does not instantaneously move. The movement would be instantaneous if the bar were perfectly rigid, but perfectly rigid materials are fundamentally impossible in the real world. Although the movement of the bar may seem uniform and instantaneous to our human eyes, it is really not. Our human eyes are simply too slow to notice the quick, but non-instantaneous, sequence of events that happens.

Public Domain Image, source: Christopher S. Baird.When you bump one end of a bar, you only locally deform that end and the rest of the bar is unaffected at first. But by inwardly deforming the near end of the bar, you have created a region of high pressure in the bar surrounded by regions of lower pressure. Said another way, you have forced the atoms in the near end of the bar to get closer to each other than the equilibrium positions of their chemical bonds. Said more simply, you have knocked the first few layers of atoms against the next few layers of atoms. What happens next?

There are several ways to derive theIdeal Gas Law, but the simplest way is to use the three simplegas laws.

AVOGADRO'S LAWstates the volume of a gas is directly proportional to the number of moles.V ∝ n

BOYLE'S LAWstates that the volume of a gas is inversely proportional to its pressure.V ∝ 1/P

CHARLES'S LAW states that the volume of a gas is directly proportional to its Kelvin temperature.V ∝ T

If we combine these laws, we getV ∝ nT/P

We covert the proportionality to an equalityV = knT/P

We replace k with the universal gas constant R and getV = nRT/P

This can be rearranged to give the IDEAL GAS LAW

PV = nRT

Ans :- An ideal gas is a theoretical gas composed of many randomly moving point particles whose only interactions are perfectly elastic collisions. The ideal gas model tends to fail at lower temperatures or higher pressures, when intermolecular forces and molecular size becomes important.

PV=nRTn= m/Mm: mass ,M: Molar mass

A constant volume gas thermometerususally consists of a bulb filled with a fixed amount of a dilutegaswhich is attached to a mercury manometer. The manometer is used to measure variation in pressure. Thisthermometer workson the principle of Law of Charles lawoption d

Yes d shi hai confirm hai na

1.3 × 10^5 pascal in pressure in atm is = 1.283 atm , 0° C = 273 K

now using PV = nRT

=> 1.283*(7) = n*(0.082057 L atm mol-1K-1)× 273

=> n = 0.401 moles

no..of molecules = 0.4Na