When a metal bar is removed from an oven, its temperature is measured at 300°F. Three minutes later, its temperature is 200°F. How long will it take for the bar to cool down to the room temperature of 70°F

Could you please tell me whether 717.5 J is correct Answer or not (Don't copy ,Incase if you are unsure just skip it . I am confused with value ∆T ) Question 1: Consider a piston–cylinder device that contains 0.5 kg air. Now, heat is transferred to the air at constant pressure and the air temperature increases by 5°C. Determine the expansion work done during this process.

On some temperature scale 0oC is equivalent to 80oV and 100oC is equivalent to 250oV. Determine the temperature in oC corresponding to 200oV.

During processing in a steel mill, a 900 lb steel casting at 800°F is quenched by plunging it into a 550 gal oil bath, which is initially at a temperature of 100°F. After the casting cools and the oil bath warms, what is the final temperature of the two? The weight per unit volume of the oil is 7.5 lb/gal. (Express your answer using four significant figures.) T F

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