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The mechanism of heat transfer through the bulk of the ceramic mug is described in a similar manner as it before. The ceramic mug consists of a collection of orderly arranged wigglers. These are particles that wiggle about a fixed position. As the ceramic particles at the boundary between the hot coffee and the mug warm up, they attain a kinetic energy that is much higher than their neighbors. As they wiggle more vigorously, theybang intotheir neighbors and increase their vibrational kinetic energy. These particles in turn begin to wiggle more vigorously and their collisions with their neighbors increase their vibrational kinetic energy. The process of energy transfer by means of the littlebangerscontinues from the particles at the inside of the mug (in contact with the coffee particles) to the outside of the mug (in contact with the surrounding air). Soon the entire coffee mug is warm and your hand feels it.This mechanism of conduction by particle-to-particle interaction is very common in ceramic materials such as a coffee mug. Does it work the same in metal objects? For instance, you likely have noticed the high temperatures attained by the metal handle of a skillet when placed upon a stovetop. The burners on the stove transfer heat to the metal skillet. If the handle of the skillet is metallic, it too attains a high temperature, certainly high enough to cause a bad burn. The transfer of heat from the skillet to the skillet handle occurs by conduction. But in metals, the conduction mechanism is slightly more complicated. In a manner similar to electrical conductivity, thermal conductivity in metals occurs by the movement offree electrons. Outer shell electrons of metal atoms are shared among atoms and are free to move throughout the bulk of the metal. These electrons carry the energy from the skillet to the skillet handle. The details of this mechanism of thermal conduction in metals are considerably more complex than the discussion given here. The main point to grasp is that heat transfer through metals occurs without any movement of atoms from the skillet to the skillet handle. This qualifies the heat transfer as being categorized as thermal conduction.

Wave-mechanics theory explains electron clouds.

thanx

In an atom both electrons and protons are present in equal Magnitude They neutralise each other's charge Therefire atom is neutral

6.25×10^18 is the correct answer of the given question

size of planet is same as that of earth, it means volume of planet is same as volume of earth. So, the radius of planet = radius of earth = R {let }

Also we know, density = mass/volume , If volume is constant then density depends upon mass and it is directly proportional to mass.

A/C to question, density of planet is twice that of earth. ∴mass of planet is twice that of earth.Let mass of earth is M Then mass of planet is 2M

Now, g = GM/R² , for earth g' = G(2M)/R² , for planet .Here you observed , 2g = g' Hence, acceleration due to gravity on surface of planet is two times of acceleration due to gravity on Earth's surface.E.g., acceleration due to gravity on planet' surface = 2 × 9.8 = 19.6 m/s²

Average speed =speed 1+speed2/248=40+u/296=40+uu=96-40=50m/s

this answer is wrong and write and is 60m/s

order of magnitude for 127008 = 1.2 x 10^5

1m=3.32fthence9.8m/sec^2=32.103ft/sec^2

(4) NothingRefractive index has no units because the refractive index is the ratio of the speed of light within the material of interest divided by the speed of light in a vacuum, thus the consistent units of measure.

Object distance, u = -40cm

Image distance, v = 40 cm

Using lens formula,

1/f=1/v-1/u=1/40-1(-40)

or Focal length,

f=+20cm

The positive sign of focal length shows that it is a convex lens.

Now,

Magnification, m = v/u= 40/(-40)= -1

Thus, the image is real, inverted and same size as object.

If candle flame is shifted 25 cm towards the lens, then

u=-(40-25)=-15cm1/20=1/v-1/(-15)=-60cmm=v/u=-60/-15=4Thus the image will be virtual, erect and enlarged.

what is this nonsense 😠

Isaac Newton

Co-inventor of calculus, a major contributor to the science of optics and a gifted mathematician, Isaac Newton (1643-1727), who was born in Lincolnshire, outlined the laws of mechanics that now underpin vast swaths of classical physics.

Most important of all, Newton outlined theprinciple of gravity, which explained how the planets revolve round the sun. During his life, he was showered with honours, including the presidency of the Royal Society. He is renowned as a supreme rationalist, though he actually wrote more about alchemy and religion, including a 300,000-word treatise.

Galileo Galilei

Born in Pisa, Galileo (1564-1642) initially trained as a doctor. On hearing of the invention of the telescope in 1609, he built his own and turned it to the heavens, revealing the existence of sunspots and a pitted, mountainous surface on the moon:the heavens were not incorruptible.

His studies also provided support for the idea that the Earth revolves round the sun. This got Galileo into considerable trouble with the Catholicchurch and he was forced to abandon that backing in 1633. His work on falling bodies also laid the groundwork for Newton’s subsequent theories.

Thanks🤗

all the 3 resistances are in parallelhence1/R=1/30+1/30+1/30R=30/3=10henceI=V/RI=2/10=1/5A

We generally gets 220 v ac supply for our homes. Their are two current ratings available in India one is 5 Amps and other is 15 Amps. The amount of current is mainly chosen on the total load you are going to use at your homes.

As our lines are connected in parallels, the voltage remains 220 v ac but the current is different for different loads. So the supply is 5 amps or 15 amps and this current is divided within the loads

2 is the right answer

A1V1= A2V2= A3v3so0.4*2= 0.8= 0.4*2= 0.8option- D

how to solve

For this integrate the acceleration as dv/dt =afrom 0 to 2hence2t^2/2+t]2-[2t^2/2+t]0t^2+t]2=4+2=6m/s

we can consider eccentricity to be a general term represented by e. Apogee is the point in the elliptical orbit where the planet is farthest from the sun and perigee is the point where the planet is nearest to sun.In order to calculate the ratio of kinetic energy, we can use conservation of angular momentum.Now, we know that angular momentum is conserved for the planet throughout the orbit. Hence,Angular momentum at apogee = angular momentum at perigeeLet rabe the distance at apogee and rpbe the distance at perigee. The value of r1andr2can be represented in terms of the semi major axis and eccentricity (e) as mentioned below. If a is the length of semi major axis, thenra= a(1+e)and,rp= a(1-e)Now, by conservation of angular momentum, if the mass of the planet is m and the velocity at apogee and perigee be vaand vprespectively.m vara= m vprp, orva/vp=rp/ra= (1-e)/(1+e)The ratio of kinetic energy is given by = (1/2mvp2)/(1/2mva2) = (vp/va)2=[(1+e)/(1-e)]2

The average acceleration is (change in Velocity)/time

=>vf = 10j , vi = 10i , t = 10

so avg. a = (10j-10i)/10 = 1j-1i = √2( j-i) North-west

option 2

Incorrect Answer...

Do not Answer If you don't know...

Let m2 > m1.

Consider the masses m₁ and m₂, with forces Tension T in the string upwards and their weights downwards, acting on them. Both of these masses are moving with same acceleration a up (m1) or down (m2 as m2>m1), asthe string is tight and has a uniform tension all along its length. This explanation is valid in the frame of reference of moving pulley with an acceleration g/2 upwards.

In the frame of reference of pulley, with an acceleration g/2 upwards, the two masses are having acceleration a and -a. To balance forces in this non-inertial frame, we need to add a fictitious force of m₁g/2 downwards on m₁ and -m₂ g/2 downwards on m₂. Then we write free body diagrams and apply Newtons' laws.

T - (m₁ g +m₁ g/2) = m₁ a => T - 3 m1*g/2 = m1 a (m₂ g +m₂ g/2) - T = m₂a => 3 m₂*g/2 - T = m₂ a

Add the two equationsto get

a = (3g/2) *(m₂- m₁) / (m₁ + m₂) then, T = 3m₁ g/2 + m₁ a = 3 m₁m₂ g / (m₁ + m₂)

which option buddy ? 🤔

v=k*q/r=k*ze/r9*50*1.6*10^9-19/9*10^-159*80*10^-10/9*10^-1580*10^-10+158*10^6

option C ) is the correct answer

supplied voltage = voltage across inductance + voltage across capacitance + voltage across resistance=60+30+40=130 volt

A similar example.

ram moves in east direction at a speed of 6m/s and shyam moves 30 degree east of north at a speed of 6m/s. the magnitude of their relative velocity is?

Time taken by the man to reach the market from home,t1= 2.5/5 = 1/2 h = 30 minTime taken by the man to reach home from the market,t2= 2.5/7.5 = 1/3 h = 20 minTotal time taken in the whole journey = 30 + 20 = 50 min

(i) 0 to 30 minAverage velocity = Displacement/Time = 2.5/(1/2) = 5 km/hAverage speed = Distance/Time = 2.5/(1/2) = 5 km/h

(ii) 0 to50 minTime = 50 min=50/60 = 5/6 hNet displacement = 0Total distance = 2.5 + 2.5 = 5 kmAverage velocity = Displacement / Time = 0Average speed = Distance / Time = 5/(5/6) = 6 km/h(iii) 0 to 40 minSpeed of the man = 7.5 km/hDistance travelled in first 30 min = 2.5 kmDistance travelled by the man (from market to home) in the next 10 min= 7.5×10/60 = 1.25 kmNet displacement = 2.5 – 1.25 = 1.25 kmTotal distance travelled = 2.5 + 1.25 = 3.75 kmAverage velocity = Displacement/Time = 1.25/(40/60)= 1.875 km/hAverage speed = Distance/Time = 3.75/(40/60) = 5.625 km/h

1

2

I=V/R+rI=2/9+1=2/10=1/5=0.2A

V= IR2 = I*(9+1)2/10= I0.2 AMPERE

14 division will be thereresistance is being shunted means a resistance is being connected in parallel with the existing resistanceso new resistance will be 4.2 ohm

Given, P1 = 40 W

And P2 = 40 W

If you've given power along each of the branches, the total power P equals the sum of all branch power values (P1+ P2 + P3 + ...).

Therefore here in this case

Total Power (P) = P1 + P2

P = 40 + 40

P = 80 Watt.

(c) is correct option

answer is 80watt because each are connected in parller