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Rama09 [41]
3 years ago
10

Extra points!

Chemistry
2 answers:
Dima020 [189]3 years ago
8 0
Grinding a glass: Physical Change
Rusting of Iron: Chemical Change
Burning a candle: Chemical Change
Sanding a wood: Physical Change
noname [10]3 years ago
3 0

Answer:

1A

2B

3B

4A

Explanation:

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One side of a plane wall is held at 200°C while the other side is exposed to a convective environment having T10°C and h 100 W/m
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Answer:

\frac{\dot Q}{A} = 151.33 W/m^2

T_c = 25.153°C

Explanation:

Given data:

one side wall temperature 200°C

other side wall temperature 10°C

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k = 2.6W/m °C

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we know that heat flux is given as

\frac{\dot Q}{A} = \frac{ T_A - T\infty}{\frac{L}{K} + \frac{1}{h}}

\frac{\dot Q}{A} = \frac{ 20- 10} {\frac{0.30}{2.6} + \frac{1}{100}}

\frac{\dot Q}{A} = 151.33 W/m^2

1515.33 W/m^2 = \frac{ T_A - T_c}{\frac{L}{K}}

solving for temperature for cold surface is given as

T_c = -1515.33 \times \frac{0.3}{2.6} + 200

T_c = 25.153°C

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A ball slowing down as it rolls across a carpet is an example of what
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A ball slowing down as it rolls across a carpet is an example of friction.

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