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3 years ago

Which statement best describes how a hearing aid works?

1 answer:

4 0

The following statement best describes how a hearing aid works, An implant bypasses parts of the cochlea and sends messages to the brain, where they are then recognized as sound.

Explanation:

The hearing aid works as An implant bypasses parts of the cochlea and sends messages to the brain, where they are then recognized as sound.
A hearing aid is a device designed to improve hearing by making sound audible to a person with hearing loss.
Modern devices uses all sophisticated digital signal processing to try and improve the speech understanding, intelligibility and comfort for the user, such as signal processing
Almost all hearing aids in use in the US are digital hearing aids Devices similar to hearing aids include cochlear implant.
Early devices, such as ear trumpets or ear horns, were the passive amplification cones which were designed to gather the sound energy and directly goes into the ear canal.
Most common issues with hearing aid fitting and use are the occlusion effect, loudness recruitment, and understanding speech in noise.

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A copper wire of original diameter .80 m exhibits a maximum tensile load/ strength at an engineering stress= 248.2 mpa. its duct

ddd [48]

Answer:

True Strain at failure = 1.386

Explanation:

For the question, ductility is given in reduction In the area to be 0.75

Let the initial Cross sectional Area of wire be Ao

And the final cross sectional Area of wire of cross sectional Area of wire at fracture be A

(Ao - A)/Ao = ductility = 0.75

Ao - A = 0.75Ao

A = Ao - 0.75Ao

A = 0.25 Ao

True Strain = In (Lf/Lo)

To obtain the ratio of the lengths of wire,

The volume of the wire stays constant, that is, Vo = Vf; Vo = Ao × Lo and Vf = A × Lf

AoLo = ALf

Lf/Lo = Ao/A

In (Lf/Lo) = In (Ao/A) = In (Ao/0.25Ao) = In 4 = 1.386

True Strain = 1.386

4 0

3 years ago

4. Long term marijuana use can cause

Mice21 [21]

What are your choices?

One could be brain damage like memory loss

7 0

2 years ago

Read 2 more answers

A steam power plant operates on an ideal Rankine cycle with two stages of reheat and has a net power output of 120 MW. Steam ent

uysha [10]

Answer:

a) 40.6%

b)72.19kg/s

Explanation:

The Rankine cycle with two reheat stages has 9 stages in total.

The maximum pressure will be at the first inlet stage of the HP turbine which is stage 3. The minimum pressure will be the exit stage of the condenser because the condenser operates under vacuum pressure which is stage 1.

The following assumptions can be made:

1 - Each component in the cycle is analyzed as an open system operating at steady-state.

2 - All of the processes are internally reversible.

3 - The turbine and pump operate adiabatically and are internally reversible, so they are also isentropic.

4 - Condensate exits the condenser as saturated liquid.

5 - The effluent from the HP turbine is a saturated vapor.

6 - No shaft work crosses the system boundary of the boiler or condenser.

7 - Changes in kinetic and potential energies are negligible

a) The thermal efficiency of the cycle is defined as the work of the cycle divided by the total heat input to the system. The stages that have heat input is stages 2-3, 4-5, 6-7.

For stage 2:

s₁=s₂ assuming isentropic

$s_1=0.4762 @ P_1=15MPa$

enthalpy will be a compressed liquid so after interpolation

$h_2=97.93+(0.4762-0.2932)((180.77-97.93)/(0.5666-0.2932))=153.38kJ/kg$

For stage 3:

Superheated steam @ T=500⁰C and P=15MPa

$h_3=3310.8kJ/kg$

Stage 4:

superheated vapor

P=5MPa

s₃=s₄=6.3480 kJ/kg, we must use interpolation to find h₄

$h_4=2925.7-(6.348-6.2111)((3069.3-2925.7)/(6.4516-6.2111))=3007.44kJ/kg$

Stage 5:

Superheated steam @ T=500⁰C and P₄=P₅=5 MPa

$h_5=3434.7kJ/kg$

Stage 6:

Superheated steam at P₆= 1MPa

s₅=s₆

$s_6=6.9781$

We find h₆ using interpolation from the steam tables:

$h_6=2943.1-(6.9781-6.9265)((3051.6-2943.1)/(7.1246-6.9265))=2970.67kJ/kg$

Stage 7:

P₇=P₆=1MPa

T=500⁰C superheated steam

$h_7=3479.1kJ/kg$

The heat into the cycle is:

$=(h_3-h_2)+(h_5-h_4)+(h_7-h_6)$

$=(3310.8-153.38)+(3434.7-3007.44)+(3479.1-2970.67)=4108.74kJ/kg$

We can determine the work out by the condenser from stage 9 to stage 1:

Stage 1:

saturated liquid P=5kPa

$h_1=137.75kJ/kg$

Stage 9:

We assume that its a saturated liquid with quality of 1 at 5kPa and

s₇=s₉ and after interpolation

$h_9=2568.53kj/kgK$

Qout = [/tex]2568.53-137.75=2430.79kJ/kg[/tex]

The thermal efficiency can be written in terms of qin and qout:

$n=1-(q_o/q_i)=1-2430.79/4093.11=0.4061$

Efficiency of 40.61%

The mass flow rate can be calculated from the Wnet:

$W_n=W_t-W_p$

Work of the turbines minus the work of the pumps:

$W_n=m((h_3-h_4)+(h_5-h_6)+(h_7-h_9)-(h_1-h_2)$

$120000=m(1662.33)$

$m=72.19$

mass flow rate of steam is 72.19 kg/s

7 0

3 years ago

Carbon resistors often come as a brown cylinder with colored bands. These colored bands can be read to determine the manufacture

alexandr1967 [171]

Answer:

a) 4.7 kΩ, +/- 5%

b) 2.0 MΩ, +/- 20%

Explanation:

a) If the resistor has the following combination of color bands:

1) Yellow = 1st digit = 4

2) Violet = 2nd digit = 7

3) Red = multiplier = 10e2

4) Gold = tolerance = +/- 5%

this means that the resistor has 4700 Ω (or 4.7 kΩ), with 5% tolerance.

b) Repeating the process for the following combination of color bands:

1) Red = 1st digit = 2

2) Black = 2nd digit = 0

3) Green = multiplier = 10e5

4) Nothing = tolerance = +/- 20%

This combination represents to a resistor of 2*10⁶ Ω (or 2.0 MΩ), with +/- 20% tolerance.

7 0

3 years ago

What is the primary water source for a water cooled recovery unit's condensing coll?

nataly862011 [7]

A) chilled water from evaporator

7 0

3 years ago