A metal sphere with radius 3.20 cm is suspended in alarge metal box with interior walls that are maintained at 30.0°C.A small electric heater is embedded in the sphere. Heat energy mustbe supplied to the sphere at the rate of 0.660 J/s to maintain thesphere at a constant temperature of 41.0°C. (a) What is the emissivityof the metal sphere? (b) What power input to the sphere isrequired to maintain it at 82.0°C? What is the ratio of the powerrequired for 82.0°C to the power required for 41.0°C? How does thisratio compare with 24? Explain.

A metal sphere with radius 3.20 cm is suspended in alarge metal box with interior walls that are maintained at 30.0°C.A small electric heater is embedded in the sphere. Heat energy mustbe supplied to the sphere at the rate of 0.660 J/s to maintain thesphere at a constant temperature of 41.0°C. (a) What is the emissivityof the metal sphere? (b) What power input to the sphere isrequired to maintain it at 82.0°C? What is the ratio of the powerrequired for 82.0°C to the power required for 41.0°C? How does thisratio compare with 24? Explain.

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Question

A metal sphere with radius 3.20 cm is suspended in a
large metal box with interior walls that are maintained at 30.0°C.
A small electric heater is embedded in the sphere. Heat energy must
be supplied to the sphere at the rate of 0.660 J/s to maintain the
sphere at a constant temperature of 41.0°C. (a) What is the emissivity
of the metal sphere? (b) What power input to the sphere is
required to maintain it at 82.0°C? What is the ratio of the power
required for 82.0°C to the power required for 41.0°C? How does this
ratio compare with 24? Explain.

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