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boyakko [2]
3 years ago
10

Which is a chemical property of iron?

Physics
1 answer:
Free_Kalibri [48]3 years ago
6 0
Im pretty sure its the first option
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A rocket takes off from Earth. It travels 825km in 75 seconds. What is the
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11 km/s

Explanation:

v=s/t

v=825km/75s

v=11km/s

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Consider a heat pump that operates on the reversed Carnot cycle with R-134a as the working fluid executed under the saturation d
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Answer:

Work out = 28.27 kJ/kg

Explanation:

For R-134a, from the saturated tables at 800 kPa, we get

h_{fg} = 171.82 kJ/kg

Therefore, at saturation pressure 140 kPa, saturation temperature is

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At saturation pressure  800 kPa, the saturation temperature is

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Now heat rejected will be same as enthalpy during vaporization since heat is rejected from saturated vapour state to saturated liquid state.

Thus, q_{reject} = h_{fg} = 171.82 kJ/kg

We know COP of heat pump

COP = \frac{T_{H}}{T_{H}-T_{L}}

        = \frac{304.31}{304.31-254.23}

         = 6.076

Therefore, Work out put, W = \frac{q_{reject}}{COP}

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                                              = 28.27 kJ/kg

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