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Alex787 [66]
3 years ago
16

Why might people be able to walk barefoot on hot coals of wood without burning their feet?

Physics
2 answers:
ki77a [65]3 years ago
8 1
Hot coals of wood? Wood is not coals. So they can't burn their feet, there are no hot coals, just wood.
katovenus [111]3 years ago
8 0

The correct answer of this question is : Low thermal conductivity of hot coals.

EXPLANATION :

Before going to answer of this question, first we have to understand the nature of hot coals of wood in terms of conductivity.

The thermal conductivity of the wood is very small i.e it is thermally insulator.

Due to the less thermal conductivity of wood, the heat  partially flows to the foot. The person will feel the heat, but not as much as the heat given by thermal conductors.

Hence, a barefoot person person can walk on hot coals of wood.


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At what angle two forces P + Q and (P - Q) act so that their resultant is :
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Use resultant formula

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#1

A be p+q and B be p-q

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\\ \rm\Rrightarrow \sqrt{(p+q)^2+(p-q)^2+2(p+q)(p-q)cos\alpha}=\sqrt{3p^2+q^2}

\\ \rm\Rrightarrow 2p^2+2q^2+2(p^2-q^2)cos\alpha=3p^2+q^2

\\ \rm\Rrightarrow 2cos\alpha=1

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#2

\\ \rm\Rrightarrow 2(p^2+q^2)+2(p^2-q^2)cos\beta=2(p^2+q^2)

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\\ \rm\Rrightarrow cos\beta=0

\\ \rm\Rrightarrow \beta=\dfrac{\pi}{2}

#3

\\ \rm\Rrightarrow 2(p^2+q^2)+2(p^2-q^2)cos\gamma=p^2+q^2

\\ \rm\Rrightarrow 2(p^2-q^2)cos\gamma=-(p^2+q^2)

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8 0
2 years ago
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A block rides on a piston that is moving vertically with simple harmonic motion. (a) If the SHM has period 2.68 s, at what ampli
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Answer:

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now at the point of maximum amplitude the force equation when Normal force is about to zero is given as

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Part b)

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so now we have

2\pi f = 12.5

f = 2 rev/s

3 0
3 years ago
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