Your houses air conditioner has COP of 12. If the house temperature is 34 Celsius then...
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Your houses air conditioner has COP of 12. If the house temperature
is 34 Celsius then...
Suppose that your air conditioner fails on Sunday at midnight (t0 = 0), and you cannot...
Suppose that your air conditioner fails on Sunday at midnight (t0 = 0), and you cannot afford to have it repaired until payday at the end of the month. Assume that the outside temperature varies according to the function A(t) = 80 5 cos(π/12)-5√3sin(π/12t) and that your inside temperature, u(t) obeys Newton’s law of cooling and is governed by the differential equation du/dt= -0.2(u-A(t)) (a) If your indoor temperature when the air conditioner failed was 70◦F , determine the dynamics...
A car air conditioner operating with R-134a as working fluid has a minimum temperature of -10°C...
A car air conditioner operating with R-134a as working fluid has a minimum temperature of -10°C and a maximum pressure of 1 MPa. The actual adiabatic compressor exit temperature is 50°C. Heat is rejected in the condenser to ambient air at 27°C. Assume no pressure loss in the heat exchangers. Find the specific heat transfer from the cold space and that to the hot space, the COP, and the isentropic efficiency of the compressor. Also, determine the exergy destroyed in...
A balloon is filled with 1000 cm3 of air. The balloon is inside a house where...
A balloon is filled with 1000 cm3 of air. The balloon is inside a house where the temperature is 20 °C. The balloon is taken outside where the air temperature is 10 °C. Assume the pressure of the air inside the balloon remains constant. Select all the correct descriptions for what happens to the air in the balloon Correct descriptions for the air in the balloon When the balloon is outside the house, it has a volume less than 1000...
Your house is located in a polluted city with an ambient ozone concentration of 80 ppb...
Your house is located in a polluted city with an ambient ozone concentration of 80 ppb by mole (exceeding the NAAQS!). The air intake into your house has a flow of 1500 L/min of air, which is the same as the outflow rate. Ozone is very reactive, and will oxidize chemicals (mostly at the surfaces of your house) such as the oils on the walls or on people’s skin. At steady state, if the indoor concentration of ozone in your...
The average house has 14 paintings on its walls. Is the mean different for houses owned...
The average house has 14 paintings on its walls. Is the mean
different for houses owned by teachers? The data show the results
of a survey of 13 teachers who were asked how many paintings they
have in their houses. Assume that the distribution of the
population is normal.
15, 13, 14, 15, 13, 11, 13, 12, 15, 14, 11, 13, 12
What can be concluded at the αα = 0.10 level of
significance?
a. For this study, we should...
You drop an ice cube into an insulated container full of water and wait for the...
You drop an ice cube into an insulated container full of water and wait for the ice cube to completely melt. The ice cube initially has a mass of 80.0 g and a temperature of 0°C. The water (before the ice cube is added) has a mass of 660 g and an initial temperature of 20.0°C. What is the final temperature (in °C) of the mixture? (Assume no energy is lost to the walls of the container, or to the...
7a) Consider a room in a house that has composite walls with an Rtt-1.5 m2K/W. The...
7a) Consider a room in a house that has composite walls with an Rtt-1.5 m2K/W. The total cross sectional area of the walls is 35 m During winter, the temperature outside the room is Tout5°C. Inside the room, there is an electric heater that emits heat at a rate of 200 W The room is occupied by 2 people that emit heat at a rate 80 W each. What is the temperature inside the room (in °C)? Express your answer...
In this problem you will estimate the heat lost by a typical house, assuming that the temperature inside is T(in) = 20 degrees celcius and the temperature outside is T(out) = 0 degrees celcius
In this problem you will estimate the heat lost by a typical house, assuming that the temperature inside is T(in) = 20 degrees celcius and the temperature outside is T(out) = 0 degrees celcius. The walls have fiberglass insulation, which dominates the heat conduction properties of the wall So we can consider the wall to have a thermal conductivity of k(wall) = 0.048 W/m/K . We will take the thickness of the walls and ceiling to be L(wall) = 12...
Part B What Celsius temperature, 12. is required to change the volume of the gas sample...
Part B What Celsius temperature, 12. is required to change the volume of the gas sample in Part A (T) = 9.0 °C. V1= 1.20x108 L) to a volume of 2.40*10L ? Assume no change in pressure or the amount of gas in the balloon. Express your answer with the appropriate units. View Available Hint(s) HÅR Value O DI ? Units T; -
1. Zion Williamson* has taken up free diving as a way to keep in shape and...
1. Zion Williamson* has taken up free diving as a way to keep in shape and pass the time while he is quarantined. At the surface of the ocean (recall that pressure is 1 atm at sea level) Zion takes a deep breath and fills his lungs with 7.00 Liters of air. What volume (in L) will the air in his lungs occupy when he dives to a depth where the pressure is 1.92 atm? Calculate the volume in liters...
A balloon is filled with 1000 cm3 of air. The balloon is inside a house where the temperature is 20 °C. The balloon is taken outside where the air temperature is 10 °C. Assume the pressure of the air inside the balloon remains constant. Select all the correct descriptions for what happens to the air in the balloon Correct descriptions for the air in the balloon When the balloon is outside the house, it has a volume less than 1000...
The average house has 14 paintings on its walls. Is the mean
different for houses owned by teachers? The data show the results
of a survey of 13 teachers who were asked how many paintings they
have in their houses. Assume that the distribution of the
population is normal.
15, 13, 14, 15, 13, 11, 13, 12, 15, 14, 11, 13, 12
What can be concluded at the αα = 0.10 level of
significance?
a. For this study, we should...
7a) Consider a room in a house that has composite walls with an Rtt-1.5 m2K/W. The total cross sectional area of the walls is 35 m During winter, the temperature outside the room is Tout5°C. Inside the room, there is an electric heater that emits heat at a rate of 200 W The room is occupied by 2 people that emit heat at a rate 80 W each. What is the temperature inside the room (in °C)? Express your answer...
Part B What Celsius temperature, 12. is required to change the volume of the gas sample in Part A (T) = 9.0 °C. V1= 1.20x108 L) to a volume of 2.40*10L ? Assume no change in pressure or the amount of gas in the balloon. Express your answer with the appropriate units. View Available Hint(s) HÅR Value O DI ? Units T; -
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