Suppose a heat source generates heat at a rate of 86.0 W (1 W = 1 J/s). How much entropy does this produce per hour in the surroundings at 28.4 °C? Assume the heat transfer is reversible.
Suppose a heat source generates heat at a rate of 86.0 W (1 W = 1...
Suppose a heat source generates heat at a rate of 72.0 W (1 W = 1 J/s). How much entropy does this produce per hour in the surroundings at 30.0 degree C? Assume the heat transfer is reversible.
A heat engine operates in a Carnot cycle between 86.0°C and 345°C. It absorbs 20,000 J of energy per cycle from the hot reservoir. The duration of each cycle is 5.00 s. (a) What is the mechanical power output of this engine? (b) How much energy does it expel in each cycle by heat?
Constants Periodic Table The average heat evolved by the cxidation of foodstufts in an average adult per hour per kliogram of body weight is 7.50 kJ.kghrAssume the weight of an average adut is 65.2 kg. Suppose the total heat evolved by this cxidation is transferred into the surroundings during a period lasting one week. Part A Calculate the entropy change of the surroundings associated with this heat transfer. Assume the surroundings are at T- 310. K. Express the entropy change...
Thermo one Question 5 A steam turbine generates energy in the form of work at the rate of 346.1 kJ/kg of steam. The steam at the inlet of the turbine is at 8 MPa, 480oC, and at a velocity of 163.5 m/s. The steam exits the turbine at 2 MPa, 240oC, and a velocity of 55.3 m/s. Heat transfer to the surroundings occurs where the outer surface (boundary) temperature is at 333.5oC. Determine the rate of entropy production (kJ/kg-K) within...
Question 6 (1 point) Shivering is one way the body generates heat to restore its internal temperature to the normal 370 C. Shivering can produce approximately 270 W of heat per square meter of body area. How long (in minutes) would a person have to shiver to raise his body temperature by 0.50 °C. Assume that this particular person has a mass of 80 kg and a surface area of 1.85 m2. Let the specific heat of the body be...
a. How much heat transfer (in kcal) is required to raise the temperature of a 0.550 kg aluminum pot containing 2.00 kg of water from 25.0°C to the boiling point and then boil away 0.600 kg of water? b. How long (in s) does this take if the rate of heat transfer is 600 W (1 watt = 1 joule/second (1 W = 1 J/s))?
(a). How much heat transfer (in kcal) is required to raise the temperature of a 0.550 kg aluminum pot containing 3.00 kg of water from 50.0°C to the boiling point and then boil away 0.800 kg of water? (b). How long (in s) does this take if the rate of heat transfer is 600 W (1 watt = 1 joule/second (1 W = 1 J/s))?
(a) What is the rate of heat conduction (in W) through the 2.00 cm thick fur of a large animal having a 1.30 m2 surface area? Assume that the animal's skin temperature is 30.0°C, that the air temperature is −6.50°C, and that fur has the same thermal conductivity as air. (Assume the thermal conductivity of air is 0.023 J/(s · m · °C).) W (b) What food intake (in kcal) will the animal need in one day to replace this...
(a)How much heat transfer (in kcal) is required to raise the temperature of a 0.600 kg aluminum pot containing 2.00 kg of water from 45.0°C to the boiling point and then boil away 0.650 kg of water? _______kcal (b) How long (in s) does this take if the rate of heat transfer is 550 W (1 watt = 1 joule/second (1 W = 1 J/s))? ________s
32 Suppose a utility generates electricity with a 36 percent efficient coal-fired power plant emitting the legal limit of 0.6 lb of SO2 per million Btus of heat into the plant. Suppose the utility encourages its customers to replace their 75-W incandescents with 18-W com pact fluorescent lamps (CFLs) that produce the same amount of light. Over the 10,000-hr (a) How many kilowatt-hours of electricity would be saved? (b) How many 2,000-lb tons of SO2 would not be emitted? (c)...