An electric heater is keeping the inside of a hut a constant temperature
a. The thermal energy released by the heater in 1 hour is equal to the thermal energy that leaves the hut in the same time period.
b. The thermal energy released by the heater in 1 hour is larger than the thermal energy that leaves the hut in the same time period.
c. The thermal energy released by the heater in 1 hour is smaller than the thermal energy that leaves the hut in the same time period.
d. All thermal energy released by the heater remains as thermal energy of objects in the hut.
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