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pashok25 [27]
2 years ago
14

if you help then I will thank u by sooo much I will give tons of points but the answer has to be right.

Engineering
2 answers:
romanna [79]2 years ago
8 0

Answer:

The first one A, " These are lines of equal air pressure".

Explanation:

emmainna [20.7K]2 years ago
8 0
Answer: A
Isobars are lines on a weather map joining together places of equal atmospheric pressure.
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Under conditions for which the same roojm temperature is mainteined bt a heating or cooling system, it is not uncommon for a per
bonufazy [111]

Answer:

Net heat transfers:  during summer = 52.253 W/m^2 during winter = 119.375 w/m^2

Explanation:

Given data :

Room temperature throughout the year = 20⁰c = 293 k

Room temperature during summer = 27⁰c = 300 k

Room temperature during winter = 14⁰c = 287 k

surface temperature of a person throughout the year = 32⁰c = 305 k

coefficient of heat transfer by natural convection (h)= 2 w /m^2 k

emissivity = 0.9

An explanation to the condition of feeling chilled during the winter and comfortable during summer  can be explained with the calculation below

The heat transfer from the surface body of a person the the room is carried out by convection and this can be calculated as

q = hΔt = 2 * ( 305  -  293) = 2 * 12 = 24 w /m^2

also calculate heat transfer through radiation using this formula

q_{rad} = εσ [ (Temperature of body)^4- (temperature of room at each season)^4 ]

ε = 0.90,(emissivity)    σ = 5.67 *10^-8 w/^2 . k ( Boltzmann's constant)

during summer :

q_{rad} = (0.90)*(5.67*10^-8)* ( 305^4 - 300^4 ) = 28.253 W/m^2

therefore the net heat transfer during the summer = 24 w/m^3 + 28.253 W/m^3 = 52.253 W/m^2

During winter :

q_{rad} = (0.90)*(5.67*10^-8) * ( 305^4 - 287^4 ) = 95.375 W/m^3

therefore the net heat transfer during the winter

= 24 w/m^3 + 95.375w/m^3 = 119.375 w/m^2

7 0
2 years ago
3. When performing overhead work on scaffolding, what protective measures must be taken to prevent objects
hjlf

Answer:

Toeboards, debris nets, or canopies

Explanation:

7 0
2 years ago
Explain why different types of equipment are required for proper conditioning of air
blagie [28]

Answer:

 Different types of equipment are required for proper conditioning of air because every air conditional space faces some geometrical and environmental issues or problems. There are some different types of equipment used for conditioning of air that are air system, water system and air-water system. In many cases the air conditioning of the system varies with size of the equipment.  

8 0
3 years ago
Establishes general guidelines concerning licensing and vehicle
gavmur [86]

Answer:

A. National Highway Safety Act

Explanation:

The National Highway Safety Act establishes general guidelines concerning licensing, vehicle registration and inspection, and traffic laws for state regulations. The act was made in 1966 to reduce the amount of death on the highway as a result of increase in deaths by 30% between 1960 and 1965

National Traffic and Motor Vehicle Safety Act regulates vehicle manufacturers  by ensuring national safety standards and issuance recalls for defective vehicles

Uniform Traffic Control Devices Act  defines shapes, colors and locations for road signs, traffic signals, and road markings

5 0
3 years ago
Read 2 more answers
¿Qué áreas del conocimiento me pueden<br> aportar a la ejecución del proyecto?
allsm [11]

Answer:

la escuela,en casa y listo...............

8 0
2 years ago
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