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Free_Kalibri [48]

3 years ago

6

A 350 gal air storage tank is initially at 100 psig. For how long can the tank supply 30 cfm of air to a machine that requires a

t least 80 psig to operate?

1 answer:

devlian [24]3 years ago

3 0

Answer:

93.8 sec

Explanation:

it is given that tab has 350 gallon

we know that 1 gallon = 0.134 cubic foot

350 gallon = 350×0.134=46.9 cubic foot

the delivery pressure is 100 psi which is greater than 80 psi to operate machine

it is given that supply volume is 30 cubic foot per minute

= $\frac{30}{60}=0.5$ $ft^{3}/sec$

$time\ required\ =\frac{tab\ air }{supply\ volume}$

$time\ required\= [tex]\frac{46.9}{0.5}$

=93.8 sec

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sp2606 [1]

Explanation:

Pressure = force/area

Pressure stays the same.

If the area is doubled the force is doubled.

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4 years ago

g (b) (4 pt) Write a function unique that identifies the repeated elements of a list and returns a list with unique elements. $

Taya2010 [7]

Answer:

I am writing a Python function unique()

def unique(list): # function unique that takes a list as parameter

unique_list = [] #list to store unique elements

for elements in list: # loop that checks every element of the list

if elements not in unique_list: # takes unique elements from list

unique_list.append(elements)

#appends unique elements from list to unique_list

return unique_list #outputs unique_list elements

Explanation:

The unique() function takes a list as argument which is named as list.

unique_list is a new list which stores unique element from the list.

The loop moves through the elements of the list one by one.

if condition checks if the element in list is not present in the unique_list which means that element is unique to the unique_list.

If this condition is true this means that the element is not repeated and is not already present in unique_list. Then that element is included to the unique_list using append() function which appends an element into the unique_list from the list.

If you want to check if this function works you pass a list with repeated elements to this function so that it can print the unique elements as follows:

print(unique([1,2,2,2,2,3,4,4,4,4,4,5]))

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6 0

4 years ago

A compressed-air drill requires an air supply of 0.25 kg/s at gauge pressure of 650 kPa at the drill. The hose from the air comp

Klio2033 [76]

Answer:

L = 46.35 m

Explanation:

GIVEN DATA

\dot m = 0.25 kg/s

D = 40 mm

P_1 = 690 kPa

P_2 = 650 kPa

T_1 = 40° = 313 K

head loss equation

$[\frac{P_1}{\rho} +\alpha \frac{v_1^2}{2} +gz_1] -[\frac{P_2}{\rho} +\alpha \frac{v_2^2}{2} +gz_2] = h_l +h_m$

where $h_l = \frac{ flv^2}{2D}$

$h_m minor loss$

density is constant

$v_1 = v_2$

head is same so, $z_1 = z_2$

curvature is constant so $\alpha = constant$

neglecting minor losses

$\frac{P_1}{\rho} -\frac{P_2}{\rho} = \frac{ flv^2}{2D}$

we know $\dot m$ is given as $= \rho VA$

$\rho =\frac{P_1}{RT_1}$

$\rho =\frac{690 *10^3}{287*313} = 7.68 kg/m3$

therefore

$v = \frac{\dot m}{\rho A}$

$V =\frac{0.25}{7.68 \frac{\pi}{4} *(40*10^{-3})^2}$

V = 25.90 m/s

$Re = \frac{\rho VD}{\mu}$

for T = 40 Degree, $\mu = 1.91*10^{-5}$

$Re =\frac{7.68*25.90*40*10^{-3}}{1.91*10^{-5}}$

Re = 4.16*10^5 > 2300 therefore turbulent flow

for Re =4.16*10^5 , f = 0.0134

Therefore

$\frac{P_1}{\rho} -\frac{P_2}{\rho} = \frac{ flv^2}{2D}$

$L = \frac{(P_1-P_2) 2D}{\rho f v^2}$

$L =\frac{(690-650)*`10^3* 2*40*10^{-3}}{7.68*0.0134*25.90^2}$

L = 46.35 m

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3 years ago

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HACTEHA [7]

Answer:

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The thermal conductivity of a material measures its ability to conduct heat.

In materials of low thermal conductivity, heat transfer occurs at a lower rate as compared to materials of high thermal conductivity.

Thermal expansion of the material refers to its tendency to change its shape, area, and volume as a result of change in temperature.

The electrical resistance of a material refers to the measure of its opposition to the flow of electric current.

<u>Stainless steel</u> has a lower coefficient of thermal conductivity along with a higher coefficient of thermal expansion and higher electrical resistance.

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3 years ago

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Leokris [45]

Answer:

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Kindly check the attached image below to know the step by step explanation.

3 0

3 years ago