If coal gives off 30 MJ/kg when burned, how much coal isneeded to heat a house requiring 2.0x 105 MJ for the wholewinter? Assume that 30% of the heat is lost up the chimney

In an insulated vessel, 255 g of ice at 0°C is added to 585 g of water at 19.0°C. (Assume the latent heat of fusion of the water is 3.33 x 105 J/kg and the specific heat is 4,186 J/kg · °C.) (a) What is the final temperature of the system? °C (b) How much ice remains when the system reaches equilibrium? Need Help? Read It

A container of 5 L water is left out on a hot day. A temperature change of 2.5°C was noted. Estimate the heat transfer that took place. (Ignore all other heat loss)

Dogs keep themselves cool by panting, which results in evaporation from moist tissues of the airway and lungs, cooling the animal. Measurements show that, on a 95 ◦F day with a relative humidity of 50%, a 25 lb dog loses 1 g of water per minute if it is panting vigorously. What rate of heat loss, in watts, does this achieve?

A bricklayer drops lump of mortar from a point 30 meters up the side of a brick buildinghe is working on and it hits the ground with a splat. Mortar has a specific heat of 1200J/(kg∙K). By how many degrees will the mortar be warmer, assuming that all the energyit acquires during the drop is converted to internal energy inside the mortar and not theground?

What mass of steam at 100∘C∘ must be added to 1.30 kgkg of ice at 0∘C∘ to yield liquid water at 18 ∘C∘? The heat of fusion for water is 333 kJ/kg, the specific heat is 4186 J/kg⋅C∘ , the heat of vaporization is 2260 kJ/kg.

(a) How.much heat transfer is required to raise the temperature of a 0.800-kg aluminum pot containing 3.50 kg of water from 25.0°C to the boiling point and then boil away 0.650 kg of water? kcal (b) How long does this take if the rate of heat transfer is 550 W (1 watt = 1 joule/second (1 W = 1 J/s))? Additional Materials O Reading

Tortilla chips are manufactured by submergingbaked and partially cooled masa at 41 °C into corn oil at 182 °C.(a) If the specific heat of masa is 1850 J>1kg # K2, how much thermalenergy is required to warm 0.454 kg of masa to the temperature ofthe oil? (b) If the production line makes 227 kg of chips every hour,at what rate (in kW) must thermal energy be supplied to the cornoil, assuming that all of the energy goes into warming the masa?

Calculate the minimum amount of energy, in joules, required to completely melt 209 g of silver initially at 16.0°C. The melting point of silver is at 962°C. Its specific heat capacity is 236 J/kg-K and its latent heat of fusion is 105 kJ/kg.

(I) What is the specific heat of a metal substance if 135 kJof heat is needed to raise 4.1 kg of the metal from 18.0°C to37.2°C?