A(n) ____ is an object setting used to control the visible display of objects.

A polymeric extruder is turned on and immediately begins producing a product at a rate of 10 kg/min. An operator realizes 20 min

hodyreva [135]

Answer:

The plot of the function production rate m(t) (in kg/min) against time t (in min) is attached to this answer.

The production rate function M(t) is:

$m(t)=[H(t)\cdot10+H(t-20)\cdot5-H(t-80)\cdot14+H(t-81)\cdot9]kg/min$ (1)

The Laplace transform of this function is:

$\displaystyle m(s)=[\frac{10+5e^{-20s}-14e^{-80s}+9e^{-81s}}{s}]kg/min$ (2)

Explanation:

The function of the production rate can be considered as constant functions by parts in the domain of time. To make it a continuous function, we can use the function Heaviside (as seen in equation (1)). To join all the constant functions, we consider at which time the step for each one of them appears and sum each function multiply by the function Heaviside.

For the Laplace transform we use the following rules:

$\mathcal{L}[f(x)+g(x)]=\mathcal{L}[f(x)]+\mathcal{L}[g(x)]=F(s)+G(s)$ (3)

$\mathcal{L}[aH(x-b)]=\displaystyle\frac{ae^{-bs}}{s}$ (4)

4 0

4 years ago

You are an engineer in an electric-generation station. You know that the flames in the boiler reach a temperature of 1200 K and

olga nikolaevna [1]

Answer:

The maximum efficiency the plant will ever achieve is 75%

Explanation:

From the question given, we recall the following:

Th flames in the boiler reaches a temperature of = 1200K

the cooling water is = 300K

The maximum efficiency the plant will achieve is defined as:

Let nmax = 1 - Tmin /Tmax

Where,

Tmin = Minimum Temperature in plants

Tmax = Maximum Temperature in plants

The temperature of the cooling water = Tmin = 300K

The temperature of the flames in boiler = Tmax = 1200k=K

The maximum efficiency becomes:

nmax = 1 - Tmin /Tmax

nmax = 1 - 300 /1200

nmax = 1-1/4 =0.75

nmax = 75%

5 0

4 years ago

Air initially at 15 psla and 60 F is compressed to 75 psia and 400 F. The power input to air under steady state condition is 5 h

Triss [41]

Answer: $\dot{m}=3.46lbm/min$

Explanation:

Initial conditions

$P_1=15 psia$

$T_1=60 F^{\circ}$

Final conditions

$P_2=75 psia$

$T_2=400F^{\circ}$

Steady flow energy equation

$\dot{m}\left [ h_1+\frac{v_1^2}{2}+gz_1\right ]+\dot{Q}=\dot{m}\left [ h_2+[tex]\frac{v_2^2}{2}+gz_2\right ]+\dot{W}$

$\dot{m}\left [ c_pT_1+\frac{0^2}{2}+g0\right ]+\dot{Q}=\dot{m}\left [ c_pT_2+\frac{0^2}{2}+g0\right ]+\dot{W}$

$\dot{m}c_p\left [ T_1-T_2\right ]+\left [ -5hp\right ]=\dot{W} -5\times 746\times 3.4121$

$-4\dot{m}-\dot{m}\times 0.24\times \left [ 400-60\right ]$

$-81.6\dot{m}-4\dot{m}=-4.949 BTU/sec$

$\dot{m}=0.057821lbm/sec$

$\dot{m}=3.46lbm/min$

3 0

3 years ago

PLEASE HELP

Anna11 [10]

PLEASE HELP
NASA scientists have determined that the chance a single person would get hit by a piece of falling satellite is one in 3,200. What can you infer based on this probability?

A. Satellites that enter Earth’s atmosphere land mostly in the ocean.

B. NASA does a good job informing people of when satellites will enter the atmosphere.

C. Satellites that enter Earth’s atmosphere land mostly in unpopulated areas.

D. Much of a satellite is destroyed during the process of entering Earth’s atmosphere.

8 0

3 years ago

Read 2 more answers

Early manufacturing, done for personal use, has been called?

AnnyKZ [126]

Answer:

self made tech yes

Explanation:

its made by yourself

7 0

3 years ago