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3 years ago

Why do you think engineering has been called the stealth profession?

Engineering

1 answer:

stiv31 [10]3 years ago

6 0

Answer:Many people don't understand or have a clear picture of what the engineers do.

Explanation: Due to the nature of the engineering profession which makes it a field of study that is connected to all aspects of life, Most people don not have a clear picture or understanding of the job of engineers.

The engineering profession,takes major parts in the core economic components of the society but their roles are not felt directly by the vast majority of the people.

Different opinion polls/ surveys have shown how uninformed the people are as it regards the field of engineering like the Harris poll.

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What is the work required to deflect a linear spring (k=32 kN/m) by 120 cm?

Anit [1.1K]

Answer:

the work done by the linear spring will be equal to 23.04 k J

Explanation:

given,

k = 32 k N /m

deflected spring = 120 cm

= 1.2 m

work done by spring can be calculate as

= $\dfrac{1}{2}kx^2$

= $\dfrac{1}{2}\times 32 \times 1.2^2$

= 23.04 k J

hence, the work done by the linear spring will be equal to 23.04 k J

6 0

3 years ago

When _____ ,the lithium ions are removed from the_____ and added into the _____

bezimeni [28]

Answer:

b. Discharging; anode; cathode

Explanation:

When discharging , it means the battery is producing a flow electric current, the lithium ions are released from the anode to the cathode which generates the flow of electrons from one side to another. When charging Lithium ions are released by the cathode and received by the anode.

8 0

3 years ago

An insulated piston-cylinder device contains 0.15 of saturated refrigerant-134a vapor at 0.8 MPa pressure. The refrigerant is no

Stells [14]

Answer:

Assumption:

1. The kinetic and potential energy changes are negligible

2. The cylinder is well insulated and thus heat transfer is negligible.

3. The thermal energy stored in the cylinder itself is negligible.

4. The process is stated to be reversible

Analysis:

a. This is reversible adiabatic(i.e isentropic) process and thus $s_{1} =s_{2}$

From the refrigerant table A11-A13

$P_{1} =0.8MPa$ $\left \{ {{ {{v_{1}=v_{g} @0.8MPa =0.025645 m^{3/}/kg } } \atop { {{u_{1}=u_{g} @0.8MPa =246.82 kJ/kg } - also {{s_{1}=s_{g} @0.8MPa =0.91853 kJ/kgK } } \right.$

sat vapor

m= $\frac{V}{v_{1} } =\frac{0.15}{0.025645} =5.8491 kg\\and \\\\P_{2} =0.2MPa \left \{ {{x_{2} =\frac{s_{2} -s_{f} }{s_{fg }}=\frac{0.91853-0.15449}{0.78339} = 0.9753 \atop {u_{2} =u_{f} +x_{2} }(u_{fg}) = 38.26+0.9753(186.25)= 38.26+181.65 =219.9kJ/kg \right. \\s_{1} = s_{2}$

$T_{2} =T_{sat @ 0.2MPa} = -10.09^{o} C$

b.) We take the content of the cylinder as the sysytem.

This is a closed system since no mass leaves or enters.

Hence, the energy balance for adiabatic closed system can be expressed as:

$E_{in} - E_{out} =$ ΔE

$w_{b, out} =$ ΔU

$w_{b, out} =m([tex]u_{1} -u_{2$ )

$w_{b, out} =$ workdone during the isentropic process

=5.8491(246.82-219.9)

=5.8491(26.91)

=157.3993

=157.4kJ

4 0

3 years ago

In fuel oil piping systems, all exterior above-grade fill piping shall be __________ when tanks are abandoned or removed.

castortr0y [4]

Answer:

Removed

Hope this Helps!

6 0

3 years ago

A defective crankshaft position sensor is a common cause of a no-start condition.

ohaa [14]

Answer:

Switching on and off

Explanation:

No starters are often caused by a faulty crankshaft actuator. The signals from this transmitter is sent to the ignition module, which turns in and out of the ignition system. If you already have an RPM sign, it's possible that a faulty ignition unit or PCM isn't turning the coils on and off. Along with button on and the motor cranking, testing for volts at the contacts with a voltmeter.

3 0

3 years ago