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3 years ago

CAD software is indispensable for only creating engineering tools. true or false

Engineering

1 answer:

astraxan [27]3 years ago

5 0

Answer:

False

Explanation:

CAD software is used for designing and making 3D models of almost anything you can imagine.

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The manufacturer of a 1.5 V D flashlight battery says that the battery will deliver 9 {\rm mA} for 37 continuous hours. During t

borishaifa [10]

Answer:

1.42 KJ

Explanation:

solution:

power in beginning $p_{0}$ =(1.5 V).(9× $10^{-3}$ A)

= 13.5 mW

after continuous 37 hours it drops to

$p_{37}$ =(1 V).(9× $10^{-3}$ A)

=9 mW

When the voltage will drop energy will not remain the same but the voltage drop will always remain same if the voltage was drop to for example from 5 V to 4.5 V the drop will remain the same.

37 hours= 37.60.60

=133200‬ s

w=(9× $10^{-3}$ A×133200‬ )+ $\frac{1}{2}(13.5.10^{-3}-9.10^{-3})(133200)$

=1.42 KJ

<em>NOTE:</em>

There maybe a calculation error but the method is correct.

7 0

3 years ago

A compressor receives air at 290 K, 95 kPa and shaft work of 5.5 kW from a gasoline engine. It should deliver a mass flow rate o

aev [14]

Answer:

P2 = 3.9 MPa

Explanation:

Given that

T₁ = 290 K

P₁ = 95 KPa

Power P = 5.5 KW

mass flow rate = 0.01 kg/s

solution

with the help of table A5

here air specific heat and adiabatic exponent is

Cp = 1.004 kJ/kg K

and k = 1.4

work rate will be

W = m × Cp × (T2 - T1) ..........................1

here T2 = W ÷ ( m × Cp) + T1

so T2 = 5.5 ÷ ( 0.001 × 1.004 ) + 290

T2 = 838 k

so final pressure will be here

P2 = P1 × $(\frac{T2}{T1})^\frac{k}{k-1}$ ..............2

P2 = 95 × $(\frac{838}{290})^\frac{1.4}{1.4-1}$

P2 = 3.9 MPa

3 0

2 years ago

A pump is used to transport water from a reservoir at one elevation to another reservoir at a higher elevation. If the elevation

erastova [34]

Answer:b

Explanation:

We know power delivered by Pump is

$P=\rho \times Q\times g\times \Delta H$

where $P\rho$ =Density of fluid

$Q$ =Flow rate

$g$ =acceleration due to gravity

$\Delta H$ =Change in Elevation

If $\Delta H$ is increased by 4 time then

$P'=\rho \times Q\times g\times (4\Delta H)$

$P'=4 P$

So power increases by four times.

4 0

3 years ago

According to the article "Edward R. Murrow: Inventing Broadcast Journalism," how did Murrow perceive the threat of Adolf Hitler?

aliya0001 [1]

Answer:

d. To Murrow, Hitler was a threat to all of civilization

Explanation:

For Murrow, Hitler's rise was a serious problem and a major threat to the entire civilization. For this reason, he believed that covering news about Hitler's advance and the battles of Nazi Germany was essential, even if the American population did not see Hitler as a threat and the European population, believed that these reprotations were only a way to denigrate the image of the continent to the world.

For Murrow reporting on Hitler's actions was as important as reporting on natural disasters.

8 0

3 years ago

If 100 J of heat is added to a system so that the final temperature of the system is 400 K, what is the change in entropy of the

Vitek1552 [10]

Answer:

0.25 J/K

Explanation:

Given data in given question

heat (Q) = 100 J

temperature (T) = 400 K

to find out

the change in entropy of the given system

Solution

we use the entropy change equation here i.e

ΔS = ΔQ / T ...................a

Now we put the value of heat (Q) and Temperature (T) in equation a

ΔS is the entropy change, Q is heat and T is the temperature,

so that

ΔS = 100/400 J/K

ΔS = 0.25 J/K

4 0

2 years ago