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HACTEHA [7]
3 years ago
7

A 2-kg mass of helium is maintained at 300 kPa and 278C in a rigid container. How large is the container, in m3?

Engineering
1 answer:
nikklg [1K]3 years ago
4 0

Answer:

3.849 m^{3}

Explanation:

Assuming that helium behaves as an ideal gas and taking gas constant of helium as  

R=2.0769 kJ/KgK

From ideal gas equation

PV=mRT and making V the subject then

V=\frac {mRT}{P}

Where m is the mass, V is the volume, P is pressure, T is temperature in Kelvin

Substituting the figures given in the question then

V=\frac {2\times 2.0769\times 278}{300}=3.849188
\approx 3.849 m^{3}

Therefore, volume of container is 3.849 m^{3}

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How do you remove a manual transmission?
Citrus2011 [14]

Answer:

Step 1

Elevate the front of the vehicle using the floor jack and support the vehicle with two jack stands. Make sure the vehicle is stable.

Step 2

Disengage all electrical components connected to the transmission. Indicate by marking the position of the drive shaft for its reinstallation. From the output shaft, remove the rear U joint. Jam the cloth to keep the liquid from dripping out of the extension housing.

Step 3

Loosen the shift linkages and the speedometer cable from the transmission manually. Place the transmission jack under the transmission, and then take a socket wrench and remove the support nut, the cross-member, and the rear support insulator from the rear engine. Support the engine with a jack stand and use the transmission jack to withdraw the transmission toward the rear of the vehicle.

Explanation:

4 0
3 years ago
You receive the bill for servicing your diesel engined car. As a good engineer you immediately notice that one of the items on b
vichka [17]

Answer:

b. spark plugs

Explanation:

Diesel engines are characterized in that the mechanism that activates the explosion of fuel is high pressures, so when the piston reaches the top of the cylinder, the pressure of the air-diessel mixture is so high that it causes the explosion, this It is what generates the power in a diesel engine.

3 0
3 years ago
In a wheatstone bridge three out of four resistors have of 1K ohm each ,and the fourth resistor equals 1010 ohm. If the battery
Dima020 [189]

Answer:

  248.756 mV

  49.7265 µA

Explanation:

The Thevenin equivalent source at one terminal of the bridge is ...

  voltage: (100 V)(1000/(1000 +1000) = 50 V

  impedance: 1000 || 1000 = (1000)(1000)/(1000 +1000) = 500 Ω

The Thevenin equivalent source at the other terminal of the bridge is ...

  voltage = (100 V)(1010/(1000 +1010) = 100(101/201) ≈ 50 50/201 V

  impedance: 1000 || 1010 = (1000)(1010)/(1000 +1010) = 502 98/201 Ω

__

The open-circuit voltage is the difference between these terminal voltages:

  (50 50/201) -(50) = 50/201 V ≈ 0.248756 V . . . . open-circuit voltage

__

The current that would flow is given by the open-circuit voltage divided by the sum of the source resistance and the load resistance:

  (50/201 V)/(500 +502 98/201 +4000) = 1/20110 A ≈ 49.7265 µA

8 0
3 years ago
A 4 cm diameter sphere of copper is initially at a temperature of 95 °C. It is placed in a very large water bath at time t- 0. T
avanturin [10]

Answer:112.376 s

Explanation:

Given

T_i=95^{\circ}C

T_f=35^{\circ}C

T_\infty \left ( ambient\right )=25^{\circ}C

h=400 watts/\left ( m^{2}^{\circ}C\right )

c=0.385 J/\left ( m^2^{\circ}C\right )

\rho =9 gm/cm^{3}

Using Newton's law of cooling

\frac{T_i-T_{\infty}}{T-T_{\infty}}=e^{\frac{ht}{\rho L_{c}c}}

\frac{95-25}{35-25}=e^{\frac{400\times 3\times 10^{-4}\times t}{9\times 2\times 0.385}}

7=e^{1.7316\times 10^{-2}\times t}

Taking log both side

t=112.376sec

4 0
3 years ago
The flow rate of liquid metal into the downsprue of a mold = 0.7 L/sec. The cross-sectional area at the top of the sprue = 750 m
katrin [286]

Answer:

367.43 mm²

Explanation:

Given:

Flow rate, Q = 0.7 L/s

1000 L = 1 m³ = 10⁹ mm³

thus,

1 L = 10⁶ mm³

Therefore,

Q = 0.7 × 10⁶ mm³/s

Cross-sectional area at the top of the sprue = 750 mm²

Length of the sprue = 185 mm

Now,

Velocity = \sqrt{2gh}

where,  g is the acceleration due to gravity = 9.81 m/s²

h is the height through which flow is taking place = 185 mm = 0.185

thus,

Velocity = \sqrt{2\times9.81\times0.185}

or

velocity = 1.9051 m/s = 1905.1 mm/s

Also,

Q = Area × Velocity

thus,

0.7 × 10⁶ = Area × 1905.1

or

Area = 367.43 mm²

3 0
3 years ago
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