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Levart [38]
3 years ago
8

What does it mean by km/h/s?

Physics
2 answers:
Leona [35]3 years ago
7 0

km means kilometers which is the measuring system for distance, /h/s means per hour.

Example: i was going 160 km/h/s

Meaning: i was going 160 kilometers per hour.

Hope i helped!

Salsk061 [2.6K]3 years ago
5 0

Km/h/s means Kilometers per hour per second.

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Steam in a heating system flows through tubes whose outer diameter is 5 cm and whose walls are maintained at a temperature of 13
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5945.27 W per meter of tube length.

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Let's assume that:

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First, let's calculate the heat transfer (Q) that occurs when there's no fin in the tubes. The heat will be transferred by convection, so let's use Newton's law of cooling:

Q = A*h*(Tb - T∞)

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A = π*D*L, where D is the diameter (5 cm = 0.05 m), and L is the length. The question wants the heat by length, thus, L= 1m.

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Now, when the fin is added, the heat will be transferred by the fin by convection, and between the fin and the tube by convection, thus:

Qfin = nf*Afin*h*(Tb - T∞)

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