B-4. A mercury thermometer is placed in a gravity free hall without touching anything. As temperature risesmercury expands and ascend in themometer. If height ascend by mercury in themometer is h then bywhat height centre of mass of "mercury and thermometer" system descend?

B-4. A mercury thermometer is placed in a gravity free hall without to

1.	B-4. A mercury thermometer is placed in a gravity free hall without touching anything. As temperature risesmercury expands and ascend in themometer. If height ascend by mercury in themometer is h then bywhat height centre of mass of "mercury and thermometer" system descend?
Answer» <p>Here thermometer is placed in gravity free region</p><p>So there is no external force on the system</p><p>when there is no force on the system its center of mass will retain its position and does not move if the whole system is initially at rest</p><p>So here the displacement of center of mass of the system will be ZERO</p>