
College Physics
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ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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What mass of water at 23.5°C must be allowed to come to thermal equilibrium with a 3.45kg cube of aluminum initially at 120 °C if the temperature reaches 75.0°C?
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- At temperatures of a few hundred kelvins the specificheat capacity of copper approximately follows theempirical formula c = α + βT + δT −2, whereα = 349 J/kg · K, β = 0.107 J/kg · K2, andδ = 4.58 × 105J · kg · K. How much heat is needed toraise the temperature of a 2.00-kg piece of copper from20 °C to 250 °C ?arrow_forwardA bar of aluminum is 1m long at a temperature of 400K. At what temperature in degrees K is the bar 0.999m in length? Use a an expansion coefficient of 25x10/degC for aluminum. 208K 312K 360K 403K esc 7. 00 2$ 4 %23 2 E R F G S C 36arrow_forwardIt’s possible to boil water by adding hot rocks to it, a technique that has been used in many societies over time. If you heat a rock in the fire, you can easily get it to a temperature of 500°C. If you use granite or other similar stones, the specific heat is about 800 J/kg ⋅ K. If 5.0 kg of water at 10°C is in a leak-proof vessel, what minimum number of 1.0 kg stones must be added to bring the water to a boil?arrow_forward
- PW-3 An elevator motor is capable of lifting a 2,500kg elevator 50.0m with a constant speed in 12.0 seconds. a) Apply Fet ma to find the force needed to lift the elevator. b) Find the power of the elevator motor in watts and in horsepower. (1H.P.-750W) c) If the power of the elevator motor is 200H.P., find the constant speed at which the 2,500kg elevator can be raised. d) If the power of the elevator motor is 200H.P., find the constant speed at which the elevator can be raised if the elevator and its contents have a mass of 4,000kgarrow_forward0.355 kg of water at 43.0°C is poured into a 0.300 kg beaker having a temperature of 25.0°C. A 0.500 kg block of aluminum at 37.0°C is placed in the water, and the system insulated. Calculate the final equilibrium temperature of the system.arrow_forwardFollowing vigorous exercise, the internal body temperature of a 72.5-kg person is 40.0°C. At what rate, in watts, must the person transfer thermal energy to reduce the body temperature to 37.0°C in 30.0 min, assuming the body continues to produce energy at the rate of 150 W?arrow_forward
- What mass of water at 30.0°C must be allowed to come to thermal equilibrium with a 1.80-kg cube of aluminum initially at 150°C to lower the temperature of the aluminum to 70.0°C? Assume any water turned to steam subsequently recondenses kg Need Help?arrow_forwardA styrofoam cooler (K = .030 W/mo C) has outside dimensions of 0.130 m x 0.330 m x 0.420 m, and an average thickness of 2.2 cm. About how long will it take for 2.10 kg of ice at 0o to melt in the cooler if the outside temperature is 20.0o?arrow_forwardWhat mass of water ice at −12° C must be added to 0.830 kg of liquid water that is initially at a temperature of 77.0° C, to produce all liquid water at a final temperature of 20.0° C ? The entire system is sealed inside an ideal calorimeter.arrow_forward
- A cube of ice is taken from the freezer at -8.5°C and placed in a 100 gram aluminum calorimeter filled with 300 grams of water at a room temperature of 20°C. The final situation is observed to be all water at 17°C. What was the mass of the ice cube? Given the following values: Cice =2100 J/kg/°C, Cwater = 4186 J/kg/°C, Caluminum 920 J/kg/°C, and for water Le 3.33×105 J/kg and Lv = 22.6×105 J/kg. 1arrow_forwardWhat mass of water at 28.0°C must be allowed to come to thermal equilibrium with a 1.70-kg cube of aluminum initially at 150°C to lower the temperature of the aluminum to 62.0°C? Assume any water turned to steam subsequently recondenses. kgarrow_forwardA styrofoam cooler (k = 0.030 W/(m-°C) has outside dimensions of 0.170 m x 0.250 m x 0.260 m, and an average thickness of 2.0 cm. How long will it take for 1.10 kg of ice at -5.0°C to melt (to water at 0°C) in the cooler if the outside temperature is 34.0°C? Assume that ice temperature increases linearly from -5.0°C to 0°C. Neglect any temperature change of the air in the cooler. Data: Specific heat of ice is 2050 J/(kg-K). Laten heat of fusion of water is 3.34×105 J/kg.arrow_forward
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