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asambeis [7]
2 years ago
7

A high school physics student with a mass of 68.18 KG is sitting in a seat reading this question the magnitude of the force with

which the seat is pushing up upon the student is
A) 6.96 N

B) 66.82 N

C) 668.16 N

D) 1200 N
Physics
1 answer:
love history [14]2 years ago
3 0
The answer to the question is C
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Steam enters a counterflow heat exchanger operating at steady state at 0.07 MPa with a specific enthalpy of 2431.6 kJ/kg and exi
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Answer:

Explanation:

Given:

Steam Mass rate, ms = 1.5 kg/min

= 1.5 kg/min × 1 min/60 sec

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Air Mass rate, ma = 100 kg/min

= 100 kg/min × 1 min/60 sec

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A.

Extracting the specific enthalpy and temperature values from property table of “Saturated water – Pressure table” which corresponds to temperature at 0.07 MPa.

xf, quality = 0.9.

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hfg = 2283.38 kJ/kg

Using the equation for specific enthalpy,

hi = hf + (hfg × xf)

= 376.57 + (2283.38 × 0.9)

= 2431.552 kJ/kg

The specific enthalpy of the outlet, h2 = hf

= 376.57 kJ/kg

B.

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= ms × (hi - h2)

= 0.025 × (2431.552 - 376.57)

= 0.025 × 2055.042

= 51.37455 kW

= 51.38 kW.

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