Suppose a block of metal heated to 250°F and then brought into a room that is at 90 ° F at 5 pm. At 5:30 pm, the temperature difference between the metal block and the room is 5 ° F. If u is the temperature of the block of metal, what is the appropriate equation to describe the rate of change of temperature of the block? O du h (u-90) dt du %3D = hu dt O du =h (u- 250) | dt O du h (90 – u) dt

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