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horrorfan [7]
2 years ago
6

Recessed incandescent luminaires not marked type ic and those marked for installing directly in ___________ must not have insula

tion over the top of the luminaire.
Physics
1 answer:
slavikrds [6]2 years ago
6 0

Answer:

Recessed incandescent luminaires not marked type ic and those marked for installing directly in insulated ceilings must not have insulation over the top of the luminaire.

Explanation:

Depending on how they interact with insulation, lighting fixtures are rated at various levels. Non-IC rated lighting fixtures can accommodate higher wattage bulbs, but they also pose the greatest fire risk when used with the incorrect insulation.

In locations with insulation, light fixtures that are not IC rated may be installed. But there is a condition. The distance between the fixture and any insulation should be 3 inches. But the 3 inch gap in the insulation would negate the goal of insulation by producing a lot of uninsulated space, so this defies logic. Building a box-style cover to cover the fixture on the attic side is one option to fix this. Drywall or foil-faced foam insulation can be used to create this box. After the cover is put in place, insulation can be added for maximum effectiveness.

To learn more about recessed incandescent luminaries. Click brainly.com/question/17218799

#SPJ4

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one of the ways, covered in the article and in class, that we charged an object was rubbing it against carpet on the floor true
astraxan [27]

Answer:

It is possible to statically charge objects by rubbing it against carpet fibers, but I'm not sure if that was in the article that you read.

Explanation:

Static charge can build up via carpet fibers.

5 0
3 years ago
What is the equation for frequency?
timofeeve [1]

Answer:

f=1/t is the equation of frqency

8 0
3 years ago
(a) A hole of 1 cm in diameter is drilled in a plate of steel at 20°C. What happens to the diameter of the hole as the steel is
Anestetic [448]

When heat is applied to a substance/material or steel in our case, a series of changes will occur, one of which is Expansion.

Hence the hole will expand from 1cm to a diameter that is greater.

Thermal expansion refers to the expansion or contraction of the dimensions of the solid, liquid or gas when their temperature is changed.

<h3>Types of Expansion</h3>
  • Linear expansion
  • Areal expansion and
  • Volumetric volume.

Learn more about expansion here:

brainly.com/question/1166774

8 0
3 years ago
The burner on an electric stove has a power output of 2.0 kW. A 710 g stainless steel tea kettle is filled with 20∘C water and p
asambeis [7]

Answer:

The volume of water that was in the kettle is  1170 cm^{3}

Explanation:

Given:

Power, P = 2.0 kW = 2000 W, Mass of stainless steel, m_{s} = 710 g = 0.71 kg at temperature of  20^{0} C

Part A:

If it takes time, t = 3.5 minutes to reach boiling point of water 100^{0} C, then from conservation of energy,

Total energy supplied by the burner = Total heat gained by the water and the stainless steel to rise from 20^{0} C to 100^{0} C

i.e. Pt = m_{s}c_{s}(100 - 20 ) + m_{w}c_{w}(100 - 20 )

m_{w} = \frac{pt - 80m_{s} C_{s} }{80c_{w} } = \frac{2000*3.5*60 - 80*0.71* 450}{80*4200}

m_{w} = 1.17 kg

where c_{w} = 4200 J/Kgk (specific heat capacity of water), c_{s} = 450 J/Kgk (specific heat capacity of steel)

But volume of water in the the kettle, v = \frac{mass}{density} = \frac{1.17}{1000}= 1.17 *10^{-3} m^{3}

∴ v = 1170 cm^{3}

4 0
4 years ago
What is the fraction of the hydrogen atom's mass (11h) that is in the nucleus? the mass of proton is 1.007276 u, and the mass of
Alex_Xolod [135]

The mass fraction of the hydrogen atom is 0.9995 u.

<h3>Calculation:</h3>

We know that mass fraction can be determines as,

Mass fraction = Mass of proton/mass of H atom

Given,

Mass of proton = 1.007276 u

Mass of H atom = 1.007825 u

Put the values in the formula,

Mass fraction = Mass of proton/mass of H atom

Mass fraction = 1.007276/1.007825

                       = 0.9995 u

Hence, the mass fraction of the hydrogen atom is 0.9995 u.

Learn more about mass fraction here:

brainly.com/question/9639161

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3 0
2 years ago
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