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3 years ago

Imagine you are designing a new backpack. Which of the following statement(s) about

Engineering

2 answers:

Hoochie [10]3 years ago

3 0

The answer is D.) both A and C

valentina_108 [34]3 years ago

3 0

A and C both sound ridiculous so therefore D!

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8. Two 40 ft long wires made of differing materials are supported from the ceiling of a testing laboratory. Wire (1) is made of

san4es73 [151]

Answer:

Material K has a modulus of elasticity E=3.389× 10¹¹ Pa

Material H has a modulus of elasticity E=1.009 × 10⁹ Pa

Material K has higher value of modulus of elasticity than material H

Material K is stiffer.

Explanation:

Wire 1 material H

Length=L = 40 ft =12.192 m

Diameter= 3/8 in = 0.009525 m

Area= A= πr²,where r=0.009525/2 =0.004763

A=3.142*0.004763² =0.00007126 m²

Force, F= 225 lb= 225*4.45 =1001.25 N

Change in length =Δ L= 0.10 in = 0.00254

To find modulus of elasticity apply'

E=F*L/A*ΔL

E=1001.25*12.192/(0.004763*0.00254)

E= 1009027923.58 Pa

E=1.009 × 10⁹ Pa

For Wire 2 material K

Length=L= 40 ft =12.192 m

Diameter = 3/16 in = 0.1875 in = 0.004763 m

Area= πr² = 3.142 * (0.004763/2)² = 0.00000567154 m²

Force, F= 225 lb= 225*4.45 =1001.25 N

Change in length =Δ L= 0.25 in =0.00635 m

To find modulus of elasticity apply'

E=F*L/A*ΔL

E= (1001.25*12.192)/(0.00000567154 * 0.00635 )

E=338955422575 Pa

E=3.389× 10¹¹ Pa

Material K has a greater modulus of elasticity

The material with higher value of E is stiffer than that with low value of E.The stiffer material is K.

8 0

3 years ago

Can I have free money? I want to get a new pc

GREYUIT [131]

Answer:

NO!

Explanation:

6 0

3 years ago

Read 2 more answers

The coefficient of performance of a reversible refrigeration cycle is always (a) greater than, (b) less than, (c) equal to the c

bezimeni [28]

Answer:

Option B is correct

Explanation:

Let

Higher temperature = $T_H$

Lower temperature = $T_L$

We know that COP is given by

$COP = \frac{T_L}{T_H-T_L}$

We see that COP is depends only on the temperature difference & Temperature difference is maximum for the Carnot cycle.

Therefore the COP of reversible refrigeration cycle is always less then the COP of an irreversible refrigeration cycle when each operates between the same two thermal reservoirs.

Therefore option B is correct

5 0

3 years ago

Steam locomotives with a 4-6-2 wheel arrangement were usually classified as what?.

Korvikt [17]

Answer:

See Explanation

Explanation:

Locomotives with 4 leading wheels, 6 driving wheels and 2 trailing wheels knowns as "Pacific" type locomotives.

7 0

3 years ago

What is created that highlights how to use the system and how to troubleshoot issues or problems?

Lisa [10]

Answer:

In this phase, the detailed user documentation is created that highlights how to use the system and how to troubleshoot issues or problems.

Explanation:

its all i got sorry but hope it helps a lil

8 0

3 years ago