3 years ago

In your opinion...

Engineering

1 answer:

ch4aika [34]3 years ago

8 0

Answer:no

TTHANLS FOR FREE POINTS

Explanation:

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A. Calculate the fraction of atom sites that are vacant for lead at its melting temperature of 327°C (600 K). Assume an energy f

NISA [10]

Answer:

a. Fraction of Atom = 2.41E-5 when T = 600K

b. Fraction of Atom = 5.03E-10 when T = 298K

Explanation:

Given

T = Temperature = 600K

Qv = Energy for formation = 0.55eV/atom

To calculate the fraction of atom sites, we make use of the following formula

Nv/N = exp(-Qv/kT)

Where k = Boltzmann Constant = 8.62E-5eV/K

Nv/N = exp(-0.55/(8.62E-5 * 600))

Nv/N = 0.000024078672493307

Nv/N = 2.41E-5

b. When T = 298K

Nv/N = exp(-0.55/(8.62E-5 * 298))

Nv/N = 5.026591237904E−10

Nv/N = 5.03E-10 ----- Approximated

6 0

4 years ago

An inventor proposes an engine that operates between the 27 deg C warm surface layer of the ocean and a 10 deg C layer a few met

SpyIntel [72]

Answer:

Engine not possible

Explanation:

source temperature T1 = 300 K

sink temperature T2= 283 K

therefore, carnot efficiency of the heat engine

η= 1- T_2/T_1

$\eta= 1-\frac{T_1}{T_2}$

$\eta= 1-\frac{283}{300}$

= 0.0566

= 5.66%

claims of work produce W = 100 kW, mass flow rate = 20 kg/s

$Q=mc_p(T_1-T_2)$

$Q=20\times4.18(300-283)$

= 1421.2 kW

now $\eta= \frac{W}Q}$

now $\eta= \frac{100}{1421.2}$

=7%

clearly, efficiency is greater than carnot efficiency hence the engine is not possible.

8 0

4 years ago

Steel bar A of 5 mm diameter is subject to a stress of 500 MPa. Aluminum bar B of 10 mm diameter is subject to a stress of 150 M

weqwewe [10]

Answer:

aluminum bar carrying a higher load than steel bar

Explanation:

Given data;

steel abr

diameter = 5 mm

stress = 500 MPa

aluminium bar

diameter = 10 mm

stress = 150 MPa

we know

stress = laod/area

for steel bar

$500 = \frac{P}{\frac{\pi}{4} 5^2}$

solving for P

P = 9817.47 N

for Aluminium bar

$150 = \frac{P}{\frac{\pi}{4} 10^2}$

solving for P

P = 11790 N

aluminum bar carrying a higher load than steel bar

6 0

3 years ago

How much force is being exerted on a 4.0 inch diameter piston if it creates a pressure of 30 psi in the system

notka56 [123]

Answer:

8000 PSI

Explanation:

I think so

4 0

3 years ago

Daisy received a class assignment for writing statements in first-order logic form. What option should Daisy use to represent th

Kay [80]

Choose the one you feel that right

5 0

4 years ago