How long does a 59 kW water heater take to raise the temperature of 170 L of water from 16°C to 38°C? The specific heat of water is 4186 J/kg-K. The density of water is 1.00 g/cm³. Number i Units
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- 1.An electric kettle transfers 900 000 J of energy to some water in 10 minutes. (a) Estimate the power of the electric kettle. (b) How long does it take to supply 1 500 000 J of energy to heat some water? 2.Energy is measured in (a)__________________, written as J. 2. The energy transferred per unit time is called (b)__________________. Its SI unit is (c)__________________, written as W. 3. (d)_______________________ (kW h) is also a unit of energy which is more common in practical use. 1 kW h is equal to (e)_______________ J. 4 The electrical energy supplied to an electrical appliance can be measured using a (f)_______________________ (readings in J) or a (g)_______________________ (readings in kW h). 6.Heater A transfers 500 kJ of heat in 30 s while heater B transfers 0.8 MJ of heat in 0.75 min. Which heater transfers heat more quickly? Explain your answer with calculations.1. An electric power company sells electricity by the KWh (or 3.6x106J) at a price of Php 12.65 per KWh. Your family uses an electric water heater in your home especially during the cold months. Find the amount charged to your bill if you heat 75 kg of water from 15Celcius to 43 celcius to fill your bathtub.An apple loses 4.5 kJ of heat as it cools per degC drop in its temperature. The amount of heat loss from the apple per degF drop in its temperature is? what is the answer a. 23.368 BTU b. 684799.38 KJ c. 649098.941 BTU d. 24652.778 kJ
- If the heat is assumed to be generated 0.03 m below the skin, the temperature difference between the skin and the interior of the body would exist if the heat were conducted to the surface is 28 k°. What is the heat rate if the surface area of the body is 1.5m? and the coefficient of the thermal conductivity= 0.2watt/m.ko. 290 watt 310 watt 280 watt 260 wattHow long does a 55 kW water heater take to raise the temperature of 100 L of water from 18°C to 40°C? The specific heat of water is 4186 J/kg-K. The density of water is 1.00 g/cm°. Number i UnitsWhat is the expression for heat current? Q is heat, t is time, T is temperature. a) ΔQ/Δt b) ΔQ/ΔT c) ΔT/Δt d) ΔQ/ΔTΔt
- A person consumes about 2700 Cal a day. 1 Cal = 4186 J, and 1 kWh = 860 Cal. Part A What is this energy in joules? (2 sig figs) Part B What is this energy in kilowatt-hours? (2 sig figs) Part C If a power company charges about 10 ¢ per kilowatt-hour, how much would this energy cost per day if the person bought it from the power company? (2 sig figs)The average solar radiation per day in Cincinnati in the month of December is 2.5 kWh/m²/day. The average energy usage for a typical household in Cincinnati is 33 kWh/day. Assuming solar panels are 20% efficient and have an area of 1.6 m², how many solar panels would be needed to provide enough energy for a typical household in Cincinnati. Use the problem presentation method to solve this problem (except the verification step).A 361-W heat pump operates between the ground, whose temperature is 6.2, and the interior of a house at 20.1. What is the theoretical maximum amount of heat per hour that the heat pump can supply to the house? Express your answer in MJ, to at least one digit after the decimal point.
- How long does a 56 kW water heater take to raise the temperature of 170L of water from 22°C to 37°C? The specific heat of water is 4186 J/kg-K. The density of water is 1.00 g/cm³. Number i Units1. How long (in seconds) will it take to heat 40 kg of water from 40°C to 80°C with a 20-kW immersion heater? Assume no energy is lost to the environment and specific heat of water is 4.186 kJ/kgoC. 2. The heat of vaporization of water is 2260 kJ/kg and the heat of fusion of water is 335 kJ/kg. Use the specific heat of water is 4.186 kJ/kg·oC 2a) How much energy (in kJ) will it take to raise the temperature of water (15 kg) from 0°C to 100oC? 2b) How much energy (in kJ) would it take to then completely convert the water to steam? 3. You want to raise the temperature of 22kg of water from 60°C to 95°C. If electricity costs $0.08/kWh, how much would it cost you to use an electric heater for this process? Use the specific heat of water is 4.186 kJ/kgoC and 1 kJ = 0.00028 kWh.The average electricity consumption of a house in Gainesville is known to be 1,007 kWh in a month (One month = 30 days). They would like to install solar panels of 29 % efficiency to generate this electricity. Given that the average solar power density in Gainesville is 5.47 kWh/m2/day, how much surface area must the panels occupy? Calculate the result in m2 but do not write the unit. Round off %3D you answer to a whole number (zero decimal place.)