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College Physics
11th Edition
ISBN: 9781305952300
Author: Raymond A. Serway, Chris Vuille
Publisher: Cengage Learning
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When determining the specific heat of a metal specimen, why must the water in the inner cup be gently stirred before putting the metal specimen in it?
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- A pond in winter has a layer of ice 5cm thick. The temperature of the air above the ice is -10C and the temperature of the water directly below the ice is 0C. (i) Find out how much heat passes by conduction through a square meter of ice each second (thermal conductivity of ice = k_ice = 2.2 W/m C) (ii) How would the amount of heat transfer differ if the ice were 7.5 cm thick instead of 5 cm thick? (how many times as much or as less)arrow_forwardA rock of mass 0.213 kg falls from rest from a height of 27.4 m into a pail containing 0.420 kg of water. The rock and water have the same initial temperature. The specific heat capacity of the rock is 1820 J/(kg C°). Ignore the heat absorbed by the pail itself, and determine the rise in temperature of the rock and water in Celsius degrees.arrow_forwardTwo water bottles X and Y have the same mass (m) and very similar size and shape but are made from different materials (Mx and My respectively) at room temperature. The same amount of boiling water is put into X and Y, and then both bottles are closed with screw caps. After 5 minutes, the temperature of water in bottle X is higher than the water in bottle Y. We may then conclude that (with an explanation): (a) Mx has higher specific heat and the water in X has lower internal energy. (b) Mx has lower specific heat and the water in Y has higher internal energy. (c) My has lower specific heat but the water in X and Y have the same internal energy. (d) My has higher specific heat but the water in X has higher internal energy. (e) My and My have the same specific heat and the water in X and Y have the same internal energy.arrow_forward
- A 14500 kg tractor trailer travels up and down a 75-meter hill on its way to pick up a load oflumber weighing 26000 kg. it then turns around and makes the trip back along the same route.Upon descending the hill in either direction the brakes absorb 20% of the truck’s energy. Whatwould the increase in temperature of the brakes be in each direction? (brake mass = 215kg,brake specific heat = 1100 J/kgC)arrow_forwardA 365-g sample of an unknown (nongaseous) material experiences a 16.0°C increase in temperature after absorbing 9.93 ✕ 103 J of energy. (a) What is the specific heat of this material? J/(kg · °C)(b) Which substance listed in the specific heat and molar specific heat table best matches the specific heat of this unknown material? mercurysilver brassgraniteglassaluminumwoodseawaterarrow_forwardTwo water bottles A and B have the same mass (m) and very similar size and shape but are made from different materials (MA and MB respectively) at room temperature. The same amount of boiling water is put into A and B, and then both bottles are closed with screw caps. After 5 minutes, the temperature of water in bottle A is higher than the water in bottle B. We may then conclude that (with your explanation):(a) MA has higher specific heat and the water in A has lower internal energy.(b) MA has lower specific heat and the water in B has higher internal energy.(c) MB has lower specific heat but the water in A and B have the same internal energy.(d) MB has higher specific heat but the water in A has higher internal energy.(e) MB and MB have the same specific heat and the water in A and B have the same internal energy.arrow_forward
- Consider the following selected properties of water: Consider the following selected properties of water: Density (liquid water): d = 1.00 g/mL Heat of fusion: AHfus = 6.01 kJ/mol Heat of vaporization: AHvap = 40.67 kJ/mol Specific heat (liquid water): Cp = 4.184 J/(g-K) = 4.184 J/(g-°C) How much heat is needed to completely evaporate 36 mL of water at its normal boiling temperature? 47 J 81 J 47 kJ 110 kJ 81 kJarrow_forward1. (a) How much heat transfer is necessary to raise the temperature of a 0.26 -kg piece of ice from -20 °C to 130 °C, including the 20 kJ/s energy needed for phase changes? Specific heat of ice = 2.090 kJ/kg °C Specific heat of water = 4.186 kJ/kg °C Specific heat of steam = 1.520 kJ/kg °C Heat of fusion of water = 334 kJ/kg Heat of vaporization = 2256 kJ/kg (i) Heat needed to warm ice to 0 °C: Q₁: ✔KJ (ii) Heat needed to melt ice at 0 °C: Q₂: KJ (iii) Heat required to warm 0 °C water to 100 °C: Q3: KJ (iv) Heat required to vaporize water at 100 °C: Q4: KJ (v) Heat required to warm 100 °C vapor to 130 °C: Q5: KJ Total heat, Q: KJ (b) How much time is required for the entire process, assuming a constant 20.0 kJ/s rate of heat transfer? Total time, t: Sarrow_forwardWater with a mass of mW = 0.400 kg and temperature of TW = 15.5°C is poured into an insulated bucket containing mI = 0.19 kg of ice at a temperature of TI = -15°C. Assume the specific heats of ice and water are constant at cI = 2.10×103 J/(kg⋅°C) and cW = 4.19×103 J/(kg⋅°C), respectively. The latent heat of fusion for water is Lf = 334×103 J/kg. Part (a) What is the final temperature of the mixture, in degrees Celsius? Tfinal = Part (b) Enter an expression for the mass of ice, in kilograms, that has melted when the mixture reaches its final temperature. mmelt = Part (c) Calculate how much ice, in kilograms, has melted when the mixture reaches its final temperature. mmelt =arrow_forward
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