If the symbol is on the top and bottom of the reference line, we call this _________

Why is the reflection step in the engineering process the most important step?

Monica [59]

Reflection helps designers to learn from their experiences, to integrate and co-ordinate different aspects of a design situation, to judge the progress of the design process, to evaluate interactions with the design context, and to plan suitable future design activities.

6 0

3 years ago

Velocity boundary layer thickness over a intermal fixed horizontal flat plate is the________ distance required for the fluid vel

antoniya [11.8K]

Answer:

Velocity boundary layer thickness over an internal or internal fixed flat plate is normal to surface distance required for the fluid velocity to attain the 99% of the free stream velocity value.

Explanation:

The affirmation is the current definition of velocity boundary layer thickness.

4 0

3 years ago

If a pendulum is 10m long, (a) what is the natural frequency and the period of vibration on the earth, where the free-fall accel

suter [353]

Answer:

(a) Natural frequency = 0.99 rad/sec (b) 0.4086 rad/sec

Explanation:

We have given length of pendulum = 10 m

(a) Acceleration due to gravity $=9.81m/sec^2$

Time period of pendulum is given by $T=2\pi\sqrt{\frac{L}{g}}$ , L is length of pendulum and g is acceleration due to gravity

So $T=2\pi\sqrt{\frac{L}{g}}=2\times 3.14\times \sqrt{\frac{10}{9.81}}=6.34sec$

Natural frequency is given by $\omega =\frac{2\pi }{T}=\frac{2\times 3.14}{6.34}=0.99rad/sec$

(b) In this case acceleration due to gravity $g=1.67m/sec^2$

So time period $T=2\pi\sqrt{\frac{L}{g}}=2\times 3.14\times \sqrt{\frac{10}{1.67}}=15.3674sec\$

Natural frequency $\omega =\frac{2\pi }{T}=\frac{2\times 3.14}{15.36}=0.4086rad/sec$

5 0

3 years ago

Production of pressure vessels is fastening an open-ended cylinder and two rigid plates with bolts. The cylinder made of brass.

marysya [2.9K]

Answer:

The pressure that the container will start to leak is 154.87 psi

Explanation:

Force on end plates F = p(πR²) ⇒ pπR²

There is an equal reaction from four bolts ∴ F = pπR² / 4 .............. (1)

due to force on bolt, each bolt stretch by $\sigma_b$

Therefore; $\sigma_b = \frac{F_bL}{A_bE_b}$ .........................(2)

Leaking will start when tightening is outstretched by half turn per 16 turns per inch.

Cylinder experience a radial expansion as p increases. it is accompanied by poisson contraction $\sigma_c$ in axial direction. That is, the bolt do not have to experience a long stretch before the pressure breaks off the plate.