(a) How much heat transfer is required to raise the temperature of a 0.750-kg aluminum pot containing 2.50 kg of water from 30.0°C to the boiling point and then boil away 0.750 kg of water?
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Q: (a) How much heat transfer (in kJ) is necessary to raise the temperature of a 0.250 kg piece of ice…
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- A cheese ripening room which, has a total surface area of A = 25.0m2, has to ensure that the inside temperature does not exceed 11.0°C at all times. If the maximum outside temperature is 35.0°C and the cheese ripening room has an air conditioner which provides 125 kW of cooling, calculate the how thi ck the wooden walls would need to bein mm, in order to ensure the inside temperature do es not go above 11.0°C. Assume that the thermal W conductivity, k of wood is 0.0800 Assume that the entire cheese ripening room is m.C made of wood (including ceiling and floor) and ignore any losses through the door as it remains closed most of the time and is well sealed. Given: P = KA(Tinside –Toutside ) LAn automobile has a mass of 1 500 kg, and its aluminum brakes have an overall mass of 6.00 kg. (a) Assuming all the internal energy transformed by friction when the car stops is deposited in the brakes and neglecting energy transfer, how many times could the car be braked to rest starting from 25.0 m/s before the brakes would begin to melt? (Assume an initial temperature of 20.0°C.) (b) Identify some effects that are neglected in part (a), but are likely to be important in a more realistic assessment of the temperature increase of the brakes.Q:33)
- A high-end gas stove usually has at least one burner rated at 14,000 Btu/h. (a) If you place a 0.50-kg aluminum pot containing 3.0 liters of water at 20°C on this burner, how long will it take to bring the water to a boil, assuming all the heat from the burner goes into the pot? min (b) Once boiling begins, how much time is required to boil all the water out of the pot? min(g) A thin, 1.44-kg slab of copper at 18.0°C is set sliding at 2.90 m/s over an identical stationary slab at the same temperature. Friction quickly stops the motion. Assuming no energy is transferred to the environment by heat, find the change in temperature of both objects. (Assume the specific heat of copper is 387 J/kg · °C.) ΔΤ. sliding slab The correct answer is not zero.°C ΔΤ. stationary slab The correct answer is not zero.°C (h) Evaluate Q and AE, int for the sliding slab and AE, 'mech for the two-slab system. ΔΕ , int ΔΕ. mech (i) Evaluate Q and AE, int for the stationary slab. ΔΕ. intIn some countries, liquid nitrogen is used on dairy trucks instead of mechanical refrigerators. A 3.00-hour delivery trip requires 170 L of liquid nitrogen, which has a density of 808 kg/m3. (a)Calculate the heat needed in kilocalories to evaporate this amount of liquid nitrogen and raise its temperature to 2.50°C. (You must use cp, and you can assume it is constant over the temperature range.) This is the amount of cooling the liquid nitrogen supplies. _____________________ kcal (b)What is this in kilowatt-hours? _________ kW · h (c)How much cooling in kilocalories would be obtained from melting an identical mass of 0°C ice? ____________kcal
- A 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.Thank you!(a) What is the rate of energy loss in watts per square meter through a glass window 2.4 mm thick if the outside temperature is -7.8°F and the inside temperature is +81°F? (b) A storm window having the same thickness of glass is installed parallel to the first window, with an air gap of 6.0 cm between the two windows. What now is the rate of energy loss if conduction is the only important energy-loss mechanism? (The thermal conductivity of window glass is 1.0 W/m-K, and of air is 0.026 W/m-K.) (a) Number i (b) Number i Units Units
- How many joules of heat transfer are required to thaw a 0.777-kg package of frozen vegetable juice originally at 0°C if its latent heat of fusion is the same as that of water (334 kJ/kg)? JOne assistant poured 998.00 cm3 of liquid mercury into a 1000.00-cm3 -flask, when both the mercury and the glass were at 4.0 ◦C. The teacher, has asked you to determine the maximum temperature he can heat the system to (to the thousandth of a degree Celsius) before the mercury overflows if mercury has a coefficient of volume expansion of 18.0 * 10-5 ◦C-1 and the glass of the flask has a coefficient of volume expansion of 1.8 * 10-5 ◦C−1.