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Tamiku [17]
3 years ago
8

You have measured the force of a hammer hitting a nail by using a new sensor. The result is 60 million dynes is this reasonable

Engineering
1 answer:
Vesnalui [34]3 years ago
8 0

Answer:

Yes, it is Reasonable.

Explanation:

The problem states that by using a new sensor, the result is 60 million dynes.

Converting the force into Newtons, by using the formula,

1 newton = 10⁵ dynes,

i.e, 1 million dynes = 10 newtons.

we get,

60 million dynes = 60 x 10 newtons = 600 newtons.

The result using a new sensor is reasonable because atmosphere exerts a force of about 10 newtons on us and 600 newtons is just 60 times of it.

Thus 600 N can be applied by the hammer on the nail and it is reasonable.

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Steam at 4 MPa and 350°C is expanded in an adiabatic turbine to 125kPa. What is the isentropic efficiency (percent) of this turb
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Answer:

\eta_{turbine} = 0.603 = 60.3\%

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Since s₂ is less than s_g and greater than s_f at 125 KPa. Therefore, the steam is in a saturated mixture state. So:

x = \frac{s_2-s_f}{s_{fg}} \\\\x = \frac{6.5843\ KJ/kg.K - 1.3741\ KJ/kg.K}{5.91\ KJ/kg.K}\\\\x = 0.88

Now, we will find h_{2s}(enthalpy at the outlet for the isentropic process):

h_{2s} = h_{f\ at\ 125KPa}+xh_{fg\ at\ 125KPa}\\\\h_{2s} = 444.36\ KJ/kg + (0.88)(2240.6\ KJ/kg)\\h_{2s} = 2416.088\ KJ/kg

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\eta_{turbine} = \frac{h_1-h_2}{h_1-h_{2s}}\\\\\eta_{turbine} = \frac{3093.3\ KJ/kg-2684.9\ KJ/kg}{3093.3\ KJ/kg-2416.088\ KJ/kg}\\\\\eta_{turbine} = \frac{408.4\ KJ/kg}{677.212\ KJ/kg}\\\\\eta_{turbine} = 0.603 = 60.3\%

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