a hot object (Cobject = 0.712 J/g C) is cooled and experiences a temperature change of -156.2 C. The amount of heat lost when the object cools measures 54,100 J. Using this information, what was the mass of the material that was cooled?

Iron is melted during the recycling process. (a) How much heat must be transferred to each kilogram of iron to bring it to its melting point, 1,536°C, from room temperature, 20°C?_________ J(b) About how many cups of coffee could you make with this much energy (1 cup = 73,600 J)? __________cups

The recommended daily caloric intake is 2000 calories (8,400,000J). This is because this is the same value for how much the average body loses to heat and work in a typical day (your change in energy is zero because you take in the same amount of energy you lose).  A) If you lose a total of 8,400,000J (Qout+W=total lost), but consume 1200 calories of food (5,000,000J), what would your change in energy be? B) Assuming your change in energy is negative (hint-it should be), where does your body get the extra energy to maintain it's temperature?

10 kg of copper wire is heated from room temperature (22 C) to 45 C. What was the change in Thermal Energy that occurred?