Two spheres of different materials one with double the radius and one-fourth wall thickness of t...

Channel:
PW Solutions
Subscribers:
451,000
Published on ● Video Link: https://www.youtube.com/watch?v=ME8NkriwDHg


Duration: 4:35
24 views
2

Two spheres of different materials one with double the radius and one-fourth wall thickness of the other, are filled with ice. If the time taken for melting complete ice in the larger sphere is 25 minutes and that for smaller one is 16 minutes, the ratio of thermal conductivity of the material of larger sphere to that of the smaller sphere is
(1) \( 4: 5 \)
(2) \( 5: 4 \)
(3) \( 25: 1 \)
(4) \( 1: 25 \)
📲PW App Link - https://bit.ly/YTAI_PWAP
🌐PW Website - https://www.pw.live



Other Videos By PW Solutions


2022-11-16The speed of sound in hydrogen at \( 0^{\circ} \mathrm{C} \) is \( 1200 \mathrm{~ms}^{-1} \). Wh...
2022-11-16Two identical speakers emit sound waves of frequency \( 680 \mathrm{~Hz} \) uniformly in all dir...
2022-11-16A street car moves rectilinearly from station \( A \) (here car stops) to the next station \( B ...
2022-11-16If an electron moves downward towards Earth surface near the Earth's equator, which direction is...
2022-11-16A thin-walled tube of mass \( m \) and radius \( R \) has a rod of mass \( m \) and very small c...
2022-11-16A source emits sound waves of frequency \( 1000 \mathrm{~Hz} \). The source moves to the right w...
2022-11-16Two narrow cylindrical pipes \( A \) and \( B \) have the same length. Pipe \( A \) is open at b...
2022-11-16State the second principle of mathematical induction.
2022-11-16How many peroxide bonds are present in caro's acid?
2022-11-16One mole of an ideal monatomic gas is taken round the cyclic process \( A B C A \) as shown in f...
2022-11-16Two spheres of different materials one with double the radius and one-fourth wall thickness of t...
2022-11-16उचित उदाहरणों द्वारा पदों को परिभाषित कीजिए F-केंद्र।
2022-11-16A point sound source is situated in a medium of bulk modulus \( 1.6 \times 10^{5} \mathrm{~N} / ...
2022-11-16If 'GOLD' is written as 'IQNF', then how can 'WIND' be written in that code ?
2022-11-16Write down the value of each of the following expressions: \[ \left(-x^{3} y^{2}\right)^{7} \]
2022-11-16Divide \[ 21 m^{3}-m^{2}+m-1 \text { by } 7 m^{2}+2 m+1 \]
2022-11-16Seven identical rods of material of thermal conductivity \( k \) are connected as shown in the g...
2022-11-16The figure shows the location of a source and detector at time \( t=0 \). The source and detecto...
2022-11-16A double-convex lens is to be made of glass with an index of refraction of \( 1.5 \). One surfac...
2022-11-16Simplify y removing brackets: \[ x-3(y-x)-4(x-2 y) \]
2022-11-16What is the number of chromosomes in the following cells of human male and female? Primary sperm...