College Physics
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Publisher: Cengage Learning
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A ceramic container used for melting metals (called a crucible) contains 1.30 kg of a molten metal. The liquid metal cools until it reaches its melting point of 1,749°C. A scientist then measures that 2.99 ✕ 104 J of
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- To determine the specific heat of an object, a student heats it to 100 ∘C in boiling water. She then places the 68.3 g object in a 159 g aluminum calorimeter containing 102 g of water. The aluminum and water are initially at a temperature of 19.1 ∘C, and are thermally insulated from their surroundings. If the final temperature is 22.7 ∘C, what is the specific heat of the object? Referring to the table, identify the material in the object. Substance Specific heat,J/(kg⋅K)J/(kg⋅K) Water 4186 Beryllium 1820 Aluminum 900 Glass 837 Silicon 703 Iron (steel) 448 Copper 387 Silver 234 Gold 129 Lead 128arrow_forwardMany species cool themselves by sweating, because as the sweat evaporates, heat is transferred to the surroundings. A human exercising strenuously has an evaporative heat loss rate of about 659 W. If a person exercises strenuously for 21.9 min, how much water must he drink to replenish his fluid loss? The heat of vaporization of water is 2430 J/g at normal skin temperature.arrow_forwardA thermally isolated container has 479 grams of water in it and a 376 gram plastic block. The water had an initial temperature of 352 K. The plastic had an initial temperature of 300 K. The plastic and water reach an equilibrium temperature of 342 K. Water has a specific heat of 4.182 J/(gram K). What is the specific heat of the plastic block in J/(gram K)?arrow_forward
- We have 39.5 g of a particular substance. Its specific heat in solid form is 0.8 J/(g K) and its specific heat in liquid form is 1.4 J/(g K); it's latent heat of melting is 170 J/g. Its initial temperature is 196 and its melting point is 223. We wish to raise its temperature to 297 (where it is a liquid). How much heat is required?arrow_forwardThank you!arrow_forwardHeat is added to 1 kg of water such that the temperature increases by 5 K. The specific heat capacity of water is 4, 180 J/(kg.K). The specific heat capacity of iron is 450 J/(kg.K). If the same amount of heat is added to 5 kg of iron, how much will the temperature increase? O 7.28 K O 12.28 K O 10.28 K O 9.28 Karrow_forward
- -1 Heat capacity of ice: 2090 J kg-¹ °C-1 Heat capacity of water (liquid): 4186 J kg-¹ °C-1 Latent heat of fusion: 3.36×105 J kg-¹ -1 Latent heat of vaporization: 2.26×107 J kg -1 Give your answers to at least three significant figures. Your answers must be accurate to 1%. How much heat energy is required to raise the temperature of 625 g of ice from a temperature of -50 °C to a temperature of -27 °C? J Submit Answer How much heat energy is required to raise the temperature of 625 g of water from a temperature of 43 °C to a temperature of 87 °C? J Submit Answer How much heat energy is required to raise the temperature of 625 g of water (initially ice) from a temperature of -50 °C to a temperature of 87 °C? J Submit Answer How much heat energy is required to evaporate 625 g of water which is initially at a temperature of 43 °C? Jarrow_forwardTo determine the specific heat of an object, a student heats it to 100 ∘C∘C in boiling water. She then places the 55.4 gg object in a 179 gg aluminum calorimeter containing 129 gg of water. The aluminum and water are initially at a temperature of 19.9 ∘C∘C, and are thermally insulated from their surroundings. If the final temperature is 22.3 ∘C∘C, what is the specific heat of the objectand the type of material?arrow_forwardA 500 g copper cup has an initial temperature of 250 oK. If the specific heat of copper is 385 J kg-1 oK-1 and 2.5 x 104 J of heat are transferred into it, what is the final temperature of the cup in Kelvins?arrow_forward
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