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N76 [4]
2 years ago
8

Which material is the best heat insulator? metal wood plastic glass

Physics
2 answers:
LuckyWell [14K]2 years ago
6 0

Answer:

Wood

Explanation:

The measure of any material to conduct heat is called its thermal conductivity. The thermal conductivity of metal is very high as compared to insulators and semiconductors.

The thermal conductivity of wood is 0.12-0.04 W/m K. Plastics have thermal conductivity of 0.2 W/m K. The thermal conductivity of fiber glass or foam glass is 0.045 W/m K

Wood is a best heat insulator. This is because, the atoms of wood have much tightly bound electrons.              

Hence, the correct option is (b).                    

OlgaM077 [116]2 years ago
5 0
Of the materials listed wood is the best insulator. It would be the least hot if exposed to similar temperatures.
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3 years ago
005 10.0 points
velikii [3]

Answer:

16.6 N

Explanation:

m = 0.52 kg, v₀ = 0, v = 8.6 m/s, t = 0.27 s

a = (v - v₀)/t

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8 0
2 years ago
Are these two correct ?
gulaghasi [49]

Answer:

7. Your answer is correct dear, just add the unit

8. answer is 1.17m/s²

Explanation:

queation 7.

m = 3kg, F = 9N, a ?

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5 0
3 years ago
It is known that the kinetics of recrystallization for some alloy obeys the Avrami equation, andthat the value of n in the expon
trapecia [35]

Answer:8.76\times 10^{-3} min^{-1}

Explanation:

Given

n=5

0.3 fraction recrystallize after 100 min

According to Avrami equation

y=1-e^{-kt^n}

where y=fraction Transformed

k=constant

t=time

0.3=1-e^{-k(100)^5}

e^{-k(100)^5} =0.7

Taking log both sides

-k\cdot (10^{10}=\ln 0.7

k=3.566\times 10^{-11}

At this Point we want to compute t_{0.5}\ i.e.\ y=0.5

0.5=1-e^{-kt^n}

0.5=e^{-kt^n}

0.5=e^{-3.566\times 10^{-11}\cdot (t)^5}

taking log both sides

\ln 0.5=-3.566\times 10^{-11}\cdot (t)^5

t^5=1.943\times 10^{10}

t=114.2 min

Rate of Re crystallization at this temperature

t^{-1}=8.76\times 10^{-3} min^{-1}

3 0
3 years ago
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