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3 years ago

What is the theoretical density in g/cm3 for Lead [Pb]?

Engineering

1 answer:

Sliva [168]3 years ago

6 0

Answer:

11.34 g/cm3

Explanation:

At room temperature, where it is in a solid state, it is 11.34 $\frac{g}{cm^{3}}$ . While at melting temperature, at 327.5 ° C, it is 10.66 $\frac{g}{cm^{3}}$

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An equation used to evaluate vacuum filtration is Q = ΔpA2 α(VRw + ARf) , Where Q ≐ L3/T is the filtrate volume flow rate, Δp ≐

larisa86 [58]

Answer:

Explanation:

The explanations and answers are shown in the following attachments

6 0

3 years ago

Determine the speed of sound in air at 400 K. Also determine the Mach number of an aircraft moving in the air at a velocity of 3

Reika [66]

Answer:

$\alpha = \sqrt{1.4 *0.287 \frac{KJ}{Kg K}*\frac{1000J}{1KJ} *400 K}= 400.899 m/s$

$Ma= \frac{310 m/s}{400.899 m/s}= 0.773$

Explanation:

For this case we have given the following data:

$T= 400 K$ represent the temperature for the air

$v = 310 m/s$ represent the velocity of the air

$k = 1.4$ represent the specific heat ratio at the room

$R = 0.287 KJ/ Kg K$ represent the gas constant for the air

And we want to find the velocity of the air under these conditions.

We can calculate the spped of the sound with the Newton-Laplace Equation given by this equation:

$\alpha = \sqrt{\frac{K}{\rho}}=\sqrt{k RT}$

Where K = is the Bulk Modulus of air, k is the adiabatic index of air= 1.4, R = the gas constant for the air, $\rho$ the density of the air and T the temperature in K

So on this case we can replace and we got:

$\alpha = \sqrt{1.4 *0.287 \frac{KJ}{Kg K}*\frac{1000J}{1KJ} *400 K}= 400.899 m/s$

The Mach number by definition is "a dimensionless quantity representing the ratio of flow velocity past a boundary to the local speed of sound" and is defined as:

$Ma=\frac{v}{\alpha}$

Where v is the flow velocity and $\alpha$ the volocity of the sound in the medium and if we replace we got:

$Ma= \frac{310 m/s}{400.899 m/s}= 0.773$

And since the Ma<0.8 we can classify the regime as subsonic.

7 0

3 years ago

C++ question <br> Thank you

Salsk061 [2.6K]

You're welcome lol! !!!!!!!!!!!!!!

:):):):)

5 0

2 years ago

What are the causes and solutions of social problems ?what are the causes and solutions of social problems

aksik [14]

Answer:

causes: unemployment, poverty,Lack of education,urbanization e.t.c

solutions:making people educated, giving people jobs

7 0

3 years ago

A rigid tank contains 10 kg of water at 90°C. If 8 kg of the water is in the liquid form and the rest is in the vapor form, dete

wlad13 [49]

Answer:

The pressure in the tank is 70.183 k Pa

The volume of the tank is 4.73 m³

Explanation:

Volume of the liquid phase

v(f) = m(f).v(f)

= 8 kg . 0.001036 m³/kg

= 0.008288 m³

Volume of the vapor phase

v(g) = m(g).v(g)

=2 kg . 2.3593 m³/kg

= 4.7186 m³

Volume of the tank = Volume of the liquid phase + Volume of the vapor phase

Volume of the tank

= 0.008288 m³ + 4.7186 m³ = 4.73 m³

5 0

3 years ago

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