1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
hoa [83]
3 years ago
12

Consider a 1000-W iron whose base plate is made of 0.5-cm-thick aluminum alloy 2024-T6 (rho = 2770 kg/m3 and cp = 875 J/kg·°C).

The base plate has a surface area of 0.03 m2. Initially, the iron is in thermal equilibrium with the ambient air at 22°C. Assuming 90 percent of the heat generated in the resistance wires is transferred to the plate, determine the minimum time needed for the plate temperature to reach 220°C.
Engineering
1 answer:
Lesechka [4]3 years ago
5 0

Answer: 79.98sec

Explanation:

Power received by plate = 0.9x1000

= 900W

Volume of metal = area x thickness

V = 0.5x10^-2 x 0.03 = 1.5x10^-4m3

Mass of metal = density x volume

= 2770kg/m3 x 1.5x10^-4 = 0.4155kg

Electrical heat energy = power x time = mass x specific heat capacity(Cp) x temperature change

900 x t = 0.4155 x 875 x (220-22)

900t = 71985.375

t = 79.98s

You might be interested in
Driving Distraction Brainstorming Session
Leto [7]

texting, phone calls, putting on makeup, brushing hair, movies playing in car, loud music, children, and that's pretty much all I could think of

please give <u>BRAINLIEST ANSWER └[T‸T]┘</u>

5 0
3 years ago
Define extensive and intensive properties of thermodynamic system.
Flura [38]

Answer:

An intense property is a physical attribute of a system that is independent of the size of the system or the quantity of material it contains. An extensive property of a system, on the other hand, is dependent on the size of the system or the amount of material in it.

Explanation:

7 0
3 years ago
Read 2 more answers
A bridge hand consists of 13 cards. One way to evaluate a hand is to calculate the total high point count (HPC) where an ace is
son4ous [18]

Answer: Let us use the pickled file - DeckOfCardsList.dat.

Explanation: So that our possible outcome becomes

7♥, A♦, Q♠, 4♣, 8♠, 8♥, K♠, 2♦, 10♦, 9♦, K♥, Q♦, Q♣

HPC (High Point Count) = 16  

4 0
3 years ago
11) If the evaporating pressure was 76 psig for r-22and the compressor inlet temperature was 65f, what would be the total superh
Karolina [17]
Saturated Pressure Temperature chart for R-22 shows 45 degF at 76 psig
65-45= 20 degF superheat



7 0
2 years ago
Individual/organizations who are responsible for monitoring, verifying, and sometimes certifying various aspects of the construc
Rus_ich [418]

The project or the site manager is responsible for monitoring or verifying the aspects of the construction process.

The site or the project manager is the individual that is responsible for the adherence to quality and guidance on the construction site.

The site or project manager has the following tasks

  • ensuring safety on the site
  • Monitoring the progress or the work that is being done
  • Sourcing materials
  • Solving problems

In conclusion, the project manager monitors and verifies aspects of the construction process.

Read more on brainly.com/question/24887827?referrer=searchResults

8 0
2 years ago
Other questions:
  • In a right triangle, the square of the length of one side is equal to the sum of the squares of the lengths of the other two sid
    10·1 answer
  • A poundal is the force required to accelerate a mass of 1 lbm at a rate of 1 ft/(s^2). Determine the acceleration of an object o
    10·1 answer
  • The rigid beam is supported by a pin at C and an A992 steel guy wire AB of length 6 ft. If the wire has a diameter of 0.2 in., d
    14·1 answer
  • Under conditions for which the same roojm temperature is mainteined bt a heating or cooling system, it is not uncommon for a per
    10·1 answer
  • At what stage of development is an engineering team the most productive?
    6·2 answers
  • In a home, air infiltrates from the outside through cracks around doors and windows. Consider a residence where the total length
    10·1 answer
  • To do you blur text in google docs
    10·1 answer
  • Determine the resistance of 100m of copper cable whose cross-sectional area is 1.5mm2​
    6·1 answer
  • Do the coil resistances have any effect on the plots?
    10·1 answer
  • What is a splitter gearbox​
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!