Determine the takeoff of 2 x 12's needed for the floor framing and sum it all up into a total linear feet of 2 x 12's required. For example, ten - 2 x 12's at 12' would be 120 linear feet.

The exit temperature of the air is 52.7 °C and rate of heat transfer from the air is 136.5 kW.

(a) To determine the exit temperature of the air, we can use the energy balance equation:

mass flow rate of air x specific heat of air x (exit temperature - inlet temperature) = mass flow rate of refrigerant x heat of vaporization of refrigerant

Rearranging and plugging in values, we get:

(8 kg/min) x (1.005 kJ/kg·K) x (exit temperature - 35 °C) = (2 kg/min) x (217.7 kJ/kg)

Solving for exit temperature, we get:

exit temperature = 52.7 °C

Therefore, the exit temperature of the air is 52.7 °C.

(b) To determine the rate of heat transfer from the air, we can use the heat transfer equation:

rate of heat transfer = mass flow rate of air x specific heat of air x (exit temperature - inlet temperature)

Plugging in values, we get:

rate of heat transfer = (8 kg/min) x (1.005 kJ/kg·K) x (52.7 °C - 35 °C)

Solving for rate of heat transfer, we get:

rate of heat transfer = 136.5 kW

Therefore, the rate of heat transfer from the air is 136.5 kW.

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The construction industry has a significant impact on society and the generation of wealth in several ways:

1. Direct and indirect employment: The construction industry is a major employer, providing jobs to a large number of people. In addition to the direct employment of construction workers, the industry also creates indirect employment opportunities in related industries such as architecture, engineering, and building materials manufacturing. The industry also provides employment opportunities for people in other fields such as finance, marketing, and project management.

2. The creation of wealth: The construction industry contributes significantly to the creation of wealth in society. The industry generates revenue for construction companies and provides employment opportunities for workers, which leads to increased consumer spending and economic growth. Construction projects also create value by increasing the supply of housing, commercial real estate, and infrastructure, which can increase property values and stimulate economic activity in the surrounding areas.

3. The impact of building on society: The construction industry has a significant impact on society through the buildings and infrastructure it creates. Buildings and infrastructure provide essential services such as housing, transportation, and utilities, which are critical to the functioning of society. The construction industry also plays a role in shaping the physical environment and the character of communities. Buildings and infrastructure can have a positive impact on the quality of life of people who use them, and can also contribute to the cultural identity and heritage of a community.

Overall, the construction industry is a vital part of society and the economy, providing employment opportunities, generating wealth, and contributing to the physical and cultural landscape of communities.

The indoor air temperature when steady operating conditions are established is 27.3 °C.

We can use the energy balance equation to solve for the indoor air temperature when steady operating conditions are established. The energy balance equation is:

Q = Qin - Qout + Qgen

where Q is the rate of heat transfer between the room and the outdoor air, Qin and Qout are the rates of heat transfer between the room and the inside and outside walls, respectively, and Qgen is the rate of heat generation due to the fan.

We can assume that the rate of heat transfer between the room and the inside wall is negligible since the room is initially at the outdoor temperature. Therefore, we have:

Q = -UA(Ti - To) + Qgen

Substituting the given values, we have:

Q = -6 × 30 × (Ti - 25) + 200

Simplifying, we get:

Ti - 25 = -1/36 (200 - 180Ti)

Solving for Ti, we get:

Ti = 27.3 °C

Therefore, the indoor air temperature when steady operating conditions are established is 27.3 °C.

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a) No, he should not comply. It is illegal and unethical to dump hazardous waste into a river.

b) The unethical issues involved include harming the environment and potentially causing harm to humans and wildlife that use the river. Dumping hazardous waste into a river can also lead to legal and financial consequences for the company.

c) The consequences of disposing of the chemicals in the river can be severe. It can contaminate the water supply, harm aquatic life, and have long-lasting effects on the ecosystem. Additionally, it can harm the health of people who rely on the river for drinking water or recreational activities.

The company could face fines, legal action, and damage to its reputation. Overall, dumping hazardous waste into a river is not only illegal but also highly unethical and can have significant consequences for both the environment and the company.

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Tobacco product that heats tobacco or synthetic nicotine without burning it, producing an aerosol. This is called "heat-not-burn" device.

These devices heat tobacco or synthetic nicotine without combustion, producing an aerosol instead of traditional smoke.

By avoiding the burning process, they are designed to reduce the harmful chemicals released during smoking.

The aerosol generated is called "vapor," which is inhaled by users, offering a similar experience to traditional smoking but with potentially reduced health risks.

Heat-not-burn products have gained popularity as an alternative to conventional cigarettes and e-cigarettes, though their long-term health effects are still being researched. tobacco or synthetic nicotine without burning it.

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A turbojet operates under ambient conditions of 7 psi and 10°F at an altitude of 20,000 ft, flying with a velocity of 900 ft/s. The compressor has a pressure ratio of 13, and the turbine inlet temperature is 2400 R.

Assuming ideal operation and constant specific heats, we can determine the following:

(a) The pressure at the turbine exit is 7 psi.

To find the pressure at the turbine exit, first calculate the pressure at the compressor exit: P2 = P1 * pressure ratio = 7 psi x 13 = 91 psi. Since it's an ideal operation, the pressure ratio across the turbine is equal to the pressure ratio across the compressor. Therefore, the pressure at the turbine exit, P3 = P2 / 13 = 91 psi / 13 = 7 psi.

(b) Using the conservation of mass and energy, the temperature at the turbine exit can be calculated.

Then, apply the ideal gas equation and the continuity equation to find the velocity of the exhaust gases. However, without more specific information, the exact numerical value for the velocity cannot be determined.

(c) The propulsive efficiency depends on the velocity of the exhaust gases and the initial velocity of the aircraft.

The higher the difference between these two velocities, the higher the propulsive efficiency. In an ideal turbojet, the efficiency can be improved by minimizing the difference between the aircraft and exhaust velocities.

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