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hoa [83]
3 years ago
5

Q.14

Engineering
1 answer:
Kay [80]3 years ago
6 0

Answer:

A. optical isolation

Explanation:

well I can't really give a good explanation because I also saw the same question in my exams and option A was the correct answer

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To protect their employees from caught-in and -between hazards, what must employers do?
marusya05 [52]

Answer:

Employers must comply with OSHA's regulations to safeguard workers from caught-in or -between dangers, which include, but are not limited to, the following:

• Protect power tools and other equipment with moving parts with guards.

• Support, secure, or otherwise make safe any equipment that has pieces that workers could become entangled in.

· Take precautions to avoid workers being crushed by tipped-over heavy machinery.

• Take precautions to avoid pinning workers between equipment and a solid object.

• Provide workers with protection when trenching and excavating.

• Provide ways to prevent constructions, such as scaffolds, from collapsing.

Explanation:

5 0
2 years ago
A square aluminum plate 5 mm thick and 150 mm on a side is heated while vertically suspended in quiescent air at 75°c. determine
Doss [256]

By using the boundary layer equation, the average heat transfer coefficient for the plate is equal to 4.87 W/m²k.

<u>Given the following data:</u>

Surface temperature = 15°C

Bulk temperature = 75°C

Side length of plate = 150 mm to m = 0.15 meter.

<h3>How to calculate the average heat transfer coefficient.</h3>

Since we have a quiescent room air and a uniform pole surface temperature, the film temperature is given by:

T_f=\frac{T_{s} + T_{\infty} }{2} \\\\T_f=\frac{15 + 75 }{2} \\\\T_f = 45

Film temperature = 45°C to K = 273 + 45 = 318 K.

For the coefficient of thermal expansion, we have:

\beta =\frac{1}{T_f} \\\\\beta =\frac{1}{318}

From table A-9, the properties of air at a pressure of 1 atm and temperature of 45°C are:

  • Kinematic viscosity, v = 1.750 \times 10^{-5} m²/s.
  • Thermal conductivity, k = 0.02699 W/mk.
  • Thermal diffusivity, α = 2.416 \times 10^{-5} m²/s.
  • Prandtl number, Pr = 0.7241.

Next, we would solve for the Rayleigh number to enable us determine the heat transfer coefficient by using the boundary layer equations:

R_{aL}=\frac{g\beta \Delta T l^3}{v\alpha } \\\\R_{aL}=\frac{9.8 \;\times \;\frac{1}{318} \;\times \;(75-15) \;\times \;0.15^3 }{1.750 \times 10^{-5}\; \times \;2.416 \times 10^{-5} } \\\\R_{aL}=\frac{9.8\; \times 0.00315 \;\times \;60\; \times\; 0.003375 }{4.228 \times 10^{-10}  }\\\\R_{aL}=1.48 \times 10^{7}

Also take note, g(Pr) is given by this equation:

g(P_r)=\frac{0.75P_r}{[0.609 \;+\;1.221\sqrt{P_r}\; +\;1.238P_r]^\frac{1}{4} } \\\\g(P_r)=\frac{0.75(0.7241)}{[0.609 \;+\;1.221\sqrt{0.7241}\; +\;1.238(0.7241)]^\frac{1}{4} }\\\\g(P_r)=\frac{0.543075}{[0.609 \;+\;1.221\sqrt{0.7241}\; +\;1.238(0.7241)]^\frac{1}{4} }\\\\g(P_r)=\frac{0.543075}{[2.5444]^\frac{1}{4} }\\\\g(P_r)=\frac{0.543075}{1.2630 }

g(Pr) = 0.430

For GrL, we have:

G_{rL}=\frac{R_{aL}}{P_r} \\\\G_{rL}=\frac{1.48 \times 10^7}{0.7241} \\\\G_{rL}=1.99 \times 10^7

Since the Rayleigh number is less than 10⁹, the flow is laminar and the condition is given by:

N_{uL}=\frac{h_{L}L}{k} = \frac{4}{3} (\frac{G_{rL}}{4} )^\frac{1}{4} g(P_r)\\\\h_{L}=\frac{0.02699}{0.15} \times  [\frac{4}{3} \times  (\frac{1.99 \times 10^7}{4} )^\frac{1}{4} ]\times 0.430\\\\h_{L}= 0.1799 \times 62.9705 \times 0.430\\\\h_{L}=4.87\;W/m^2k

Based on empirical correlation method, the average heat transfer coefficient for the plate is given by this equation:

N_{uL}=\frac{h_{L}L}{k} =0.68 +  \frac{0.670 R_{aL}^\frac{1}{4}}{[1+(\frac{0.492}{P_r})^\frac{9}{16}]^\frac{4}{19}   } \\\\h_{L}=\frac{0.02699}{0.15} \times ( 0.68 +  \frac{0.670 (1.48 \times 10^7)^\frac{1}{4}}{[1+(\frac{0.492}{0.7241})^\frac{9}{16}]^\frac{4}{19}   })\\\\h_{L}=4.87\;W/m^2k

Read more on heat transfer here: brainly.com/question/10119413

3 0
2 years ago
5. OSHA ensures that employees have the right to:
ElenaW [278]
The answer is osha ensure that employers have right to succeed in what they do best receive information
7 0
3 years ago
Please help<br> describe the impact that a toy robot has had or could have on its intended audience
GuDViN [60]
Depending on the age the toy is made for it could teach younger children things such as letters and numbers and for a older kid it could teach them how different things are put in the robot to help it work
3 0
3 years ago
Read 2 more answers
Elements in the same ____ have the same numbers of valence electrons?
lions [1.4K]
Explanation: For main group elements, the number of valence electrons is the same in every element in the same group. Group 1 elements have 1 valence electron in the s orbital.
8 0
2 years ago
Read 2 more answers
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