Homework Answers
Find the input energy using the power and time. Find the output
energy using the heat energy needed for raising the temperature of
water. Find the efficiency by dividing the output energy by input
energy
Let us assume that the power output of the kettle is 2298 Watts. If this kettle...
Let us assume that the power output of the kettle is 2298 Watts. If this kettle is filled with 2.1 Litres of water (Cp = 4.2 kJ/(kg.K), Density = 1000 kg/m3) taken from the tap at 10°C, what is the minimum time required to boil the water (at 100ºC)? Provide your answer to the nearest second (ie. no decimal places).
An aluminum tea kettle of 0.45-kg containing 2.40-kg of water at 25°C is placed on a...
An aluminum tea kettle of 0.45-kg containing 2.40-kg of water at
25°C is placed on a
burner. Assuming that the burner is rated at 2000 Watt, how long
will it take to bring
the water to a boil? (b) Once boiling begins, how much time is
required to boil all the
water out of the tea kettle? Assume that no energy is lost in this
process.
Latent Heat of Fusion Latent Heat of Vaporization Specific Heats SubstcJkg. C cal/g- CS...
An electric immersion heater has a power rating of 1800 W. If the heater is placed...
An electric immersion heater has a power rating of 1800 W. If the heater is placed in a 1.2 kg of water at 25 °C, how many minutes will it take to bring the water to a boiling temperature? (Assume that there is no heat loss except to the water itself. cwater=4186 J/kg.°C)
An electric immersion heater has a power rating of 1200 W. If the heater is placed...
An electric immersion heater has a power rating of 1200 W. If the heater is placed in a 1.6 kg of water at 15 °C, how many minutes will it take to bring the water to a boiling temperature? (Assume that there is no heat loss except to the water itself. cwater=4186 J/kg.°C)
2. Power Plant Turbine Calculation: A power plant boiler operates at 10 MPa and heats water...
2. Power Plant Turbine Calculation: A power plant boiler operates at 10 MPa and heats water (H:0) to 600 °C after which it passes through a turbine for power generation. The H20 is discharged from the turbine at 8 kPa x = 0.90. The mass flow rate of H20 through the power plant is m = 110kg/s. (a) Calculate the actual turbine work w rurdize = ? MW. (b) Assuming adiabatic and reversible operation of the turbine, what is the...
Problem 10: Suppose a battery operates a 1.95 W electric clock for 16 months. A) What...
Problem 10: Suppose a battery operates a 1.95 W electric clock for 16 months. A) What is the available energy content, in joules, of the battery? B) How many years can a battery that supplies 7.75 X 10' J run a pocket calculator that consumes energy at the rate of 0.95 x 10-3 W? Problem 4: Consider the kinetic energy of a 22000-kg truck moving at 107.5 kmh and that of an 92.5- kg astronaut in orbit moving at 27500...
Question: A kettle holding 1.18 L of water at T, 16.7 C is switched on. The...
Question: A kettle holding 1.18 L of water at T, 16.7 C is switched on. The kettle uses P 1286 W of electricity. The latent heat of vaporization is L 2.26 x 10Jkgwhile the latent heat of fusion is L3.33 x 10 Jkg Part 1) How much energy is required to increase the temperature of the water to 100 C? Q = Part 2) If the kettle is 100% efficient, with all the supplied power going into heating the water,...
A coal-fired steam power plant produces 175 MW of electric power. The power plant operates on...
A coal-fired steam power plant produces 175 MW of electric power. The power plant operates on a Rankine cycle with turbine inlet conditions of 7 MPa and 550oC and a condenser pressure of 15 kPa. The turbine efficiency and pump efficiency are both 0.8. The coal has a heating value (energy released when the fuel is burned) of 29,300 kJ/kg. Assuming that 85 percent of this energy is transferred to the steam in the boiler and that the electric generator...
b) A water droplet of mass 2.00 x 10-11 kg is located in the air near...
b) A water droplet of mass 2.00 x 10-11 kg is located in the air near the ground during a stormy day. An atmospheric electric field of magnitude 4.50 x 10' N/C points vertically downward in the vicinity of the water droplet. The droplet remains suspended at rest in the air. What is the electric charge on the droplet?
A reheat power plant operates between the pressures of 10 MPa and 5 kPa. Steam enters...
A reheat power plant operates between the pressures of 10 MPa and 5 kPa. Steam enters the high and low pressure turbines at 400 °C. If the steam leaves the high pressure turbine at 4 MPa and steam is at saturated vapour state at the end of both turbines, total specific power output of this power plant is; A heat pump is absorbing heat from the cold outdoors at 5°C and supplying heat to a house at 25°C at a...
An aluminum tea kettle of 0.45-kg containing 2.40-kg of water at
25°C is placed on a
burner. Assuming that the burner is rated at 2000 Watt, how long
will it take to bring
the water to a boil? (b) Once boiling begins, how much time is
required to boil all the
water out of the tea kettle? Assume that no energy is lost in this
process.
Latent Heat of Fusion Latent Heat of Vaporization Specific Heats SubstcJkg. C cal/g- CS...
2. Power Plant Turbine Calculation: A power plant boiler operates at 10 MPa and heats water (H:0) to 600 °C after which it passes through a turbine for power generation. The H20 is discharged from the turbine at 8 kPa x = 0.90. The mass flow rate of H20 through the power plant is m = 110kg/s. (a) Calculate the actual turbine work w rurdize = ? MW. (b) Assuming adiabatic and reversible operation of the turbine, what is the...
Problem 10: Suppose a battery operates a 1.95 W electric clock for 16 months. A) What is the available energy content, in joules, of the battery? B) How many years can a battery that supplies 7.75 X 10' J run a pocket calculator that consumes energy at the rate of 0.95 x 10-3 W? Problem 4: Consider the kinetic energy of a 22000-kg truck moving at 107.5 kmh and that of an 92.5- kg astronaut in orbit moving at 27500...
Question: A kettle holding 1.18 L of water at T, 16.7 C is switched on. The kettle uses P 1286 W of electricity. The latent heat of vaporization is L 2.26 x 10Jkgwhile the latent heat of fusion is L3.33 x 10 Jkg Part 1) How much energy is required to increase the temperature of the water to 100 C? Q = Part 2) If the kettle is 100% efficient, with all the supplied power going into heating the water,...
b) A water droplet of mass 2.00 x 10-11 kg is located in the air near the ground during a stormy day. An atmospheric electric field of magnitude 4.50 x 10' N/C points vertically downward in the vicinity of the water droplet. The droplet remains suspended at rest in the air. What is the electric charge on the droplet?
A reheat power plant operates between the pressures of 10 MPa and 5 kPa. Steam enters the high and low pressure turbines at 400 °C. If the steam leaves the high pressure turbine at 4 MPa and steam is at saturated vapour state at the end of both turbines, total specific power output of this power plant is; A heat pump is absorbing heat from the cold outdoors at 5°C and supplying heat to a house at 25°C at a...
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