Two identical balls,A and B,of uniform compos | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(B) When the balls are heated,they expand,and their radii increase. This causes the center of mass of each ball to shift.For ball $A$,which is suspend

Vedclass · Accepted Answer

$T_A > T_B$

Vedclass · Answer

(B) When the balls are heated,they expand,and their radii increase. This causes the center of mass of each ball to shift.For ball $A$,which is suspended from the ceiling,the expansion causes its center of mass to move downward. As the center of mass moves downward,the gravitational potential energy of ball $A$ decreases. This decrease in potential energy is converted into internal energy,providing additional heating to the ball.For ball $B$,which rests on the floor,the expansion causes its center of mass to move upward. As the center of mass moves upward,the gravitational potential energy of ball $B$ increases. This increase in potential energy requires energy,which is taken from the absorbed heat,effectively reducing the energy available for increasing the temperature of the ball.Since ball $A$ gains additional internal energy from its gravitational potential energy change while ball $B$ loses some of its absorbed heat to increase its gravitational potential energy,the final temperature of ball $A$ will be higher than that of ball $B$. Therefore,$T_A > T_B$.

Similar Questions

$A$ metal ball immersed in alcohol weighs $W_1$ at $0^{\circ}C$ and $W_2$ at $50^{\circ}C$. The coefficient of cubical expansion of the metal $(\gamma)_m$ is less than that of alcohol $(\gamma)_{Al}$. Assuming that the density of the metal is large compared to that of alcohol,it can be shown that:

$22320 \ cal$ of heat is supplied to $100 \ g$ of ice at $0^{\circ} C$. If the latent heat of fusion of ice is $80 \ cal \ g^{-1}$ and latent heat of vaporization of water is $540 \ cal \ g^{-1}$, the final amount of water thus obtained and its temperature respectively are:

$A$ thermocouple develops $40\,\mu V/K$. If the hot and cold junctions are at $40\,^{\circ}C$ and $20\,^{\circ}C$ respectively,then the emf developed by a thermopile using $150$ such thermocouples in series shall be ............... $mV$.

$A$ block of ice at $-20\,^oC$ having a mass of $2\, kg$ is added to $3\, kg$ of water at $15\,^oC$. Neglecting heat losses and the heat capacity of the container,which of the following is true?

Vedclass Test Series

Exam Paper Generator

Online Exam Module