Physics - Heat & Thermo Question with Solution | TestHub
PhysicsHeat & ThermoHeat TransferMedium2 min
PhysicsMediummultiple choice
A hollow sphere and a hollow cube of the same metal and negligible thickness both have a surface area of 600 cm². Each is filled with warm water at the same temperature and placed in surroundings a few degrees colder. Then at the start:
Options:(select one or more)
Answer:
B, C, D
Solution:
Equal areas and equal emissivity give equal power (B). The cube has edge cm, volume 1000 cm³. The sphere has cm, volume 1382 cm³. With equal power the rate of fall is inversely proportional to the water mass, so cube : sphere = (D), and the cube cools faster (C). A is false.
Subject:PhysicsTopic:Heat & ThermoSubtopic:Heat Transfer
⏱ 2m
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