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2 years ago

Multiple Choice

Engineering

1 answer:

hichkok12 [17]2 years ago

4 0

Answer:

Geological engineers can help determine if the soil and structural stability in the building's location are satisfactory.

Explanation:

Geologic Engineering refers to a job which applies geology to engineering. This type of job focuses on the investigation of sites in response to soil, rock and groundwater. They help design the major structures for engineering works, thus, it is also their role to know whether the building's soil and structural stability are satisfactory. They determine how much of the structure is a safe load for the soil it is standing upon. They also test the strength of both rock and soil at different depths. This will help them know whether the location will be suitable for the skyscraper.

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A specimen of a 4340-steel alloy with a plane strain fracture toughness of 54.8 MPa sqrt(m) (50 ksi sqrt(in.)) is exposed to a s

Lunna [17]

Answer:

critical stress $\sigma _c$ = 1382.67 MPa

Explanation:

given data

plane strain fracture toughness = 54.8 MP

length of surface creak = 0.5 mm

we take here

parameter Y = 1.0

solution

we apply critical stress formula that is

critical stress $\sigma _c$ = $\frac{K}{Y\sqrt{\pi \times a} }$ .............................1

here K is design stress plane strain fracture toughness and a is length of surface creak so put all these value in equation 1

critical stress $\sigma _c$ = $\frac{54.8 \times 10^6}{1 \sqrt{\pi \times 5 \times 106{-4}}}$

solve it we get

critical stress = 1382.67 MPa

As exposed stress 1030 MPa is less than critical stress 1382 MPa

so that fracture will not be occur here

7 0

2 years ago

A wall in a house contains a single window. The window consists of a single pane of glass whose area is 0.11 m2 and whose thickn

Assoli18 [71]

Answer:

Explanation:

Given that,

The area of glass $A_g$ = $0.11m^2$

The thickness of the glass $t_g=4mm=4\times10^-^3m$

The area of the styrofoam $A_s=11m^2$

The thickness of the styrofoam $t_s=0.20m$

The thermal conductivity of the glass $k_g=0.80J(s.m.C^o)$

The thermal conductivity of the styrofoam $k_s=0.010J(s.m.C^o)$

Inside and outside temperature difference is ΔT

The heat loss due to conduction in the window is

$Q_g=\frac{k_gA_g\Delta T t}{t_g} \\\\=\frac{(0.8)(0.11)(\Delta T)t}{4.0\times 10^-^3}\\\\=(22\Delta Tt)j$

The heat loss due to conduction in the wall is

$Q_s=\frac{k_sA_s\Delta T t}{t_g} \\\\=\frac{(0.010)(11)(\Delta T)t}{0.20}\\\\=(0.55\Delta Tt)j$

The net heat loss of the wall and the window is

$Q=Q_g+Q_s\\\\=\frac{k_gA_g\Delta T t}{t_g}+\frac{k_sA_s\Delta T t}{t_g}\\\\=(22\Delta Tt)j +(0.55\Delta Tt)j \\\\=(22.55\Delta Tt)j$

The percentage of heat lost by the window is

$=\frac{Q_g}{Q}\times 100\\\\=\frac{22\Delta T t}{22.55\Delta T t}\times 100\\\\=97.6 \%$

7 0

3 years ago

A piston–cylinder device contains 15 kg of saturated refrigerant-134a vapor at 280kPa. A resistance heater inside the cylinder w

attashe74 [19]

Answer:

18.77 A

Explanation:

To solve this we use the energy balance equation, that is:

$E_{in}-E_{out}=\Delta E_{sys}\\\\Q_{in}+W_{in}+W_{out}=\Delta U\\\\Q_{in}+W_{in}=\Delta U\\\\But\ W_{in}=Voltage(V)*Current(I)*change\ in\ time(\Delta t)=VI\Delta t,\Delta U=m(h_2-h_1)\\\\Given\ that\ m=15kg,V=110\ V,\Delta t=6\ min = (6*60\ s)=360\ s,Q_{in}=20.67\ kJ/kg*15\ kg=310.05\ kJ=310050\ J\\\\From\ table: At\ P_1=280kPa, h_1=249.71\ kJ/kg=249710\ J/kg;At\ P_2=280kPa \ and\ T_1=75^oC,P_2=319.95\ kJ/kg=319950\ J/kg\\\\Substituting:\\\\310500+(110*360*I)=15(319950-249710)\\\\$

$39600I=1053600-310500\\\\39600I=743100\\\\I=18.77\ A$

3 0

2 years ago

Write a program that reads a month number (1 for January, 12 for December) and the day number and displays thedate afterxdays, e

attashe74 [19]

Answer:

Python datetime [52 exercises with solution]

[An editor is available at the bottom of the page to write and execute the scripts.]

1. Write a Python script to display the various Date Time formats - Go to the editor

a) Current date and time

b) Current year

c) Month of year

d) Week number of the year

e) Weekday of the week

f) Day of year

g) Day of the month

h) Day of week

Click me to see the solution

2. Write a Python program to determine whether a given year is a leap year. Go to the editor

Click me to see the solution

3. Write a Python program to convert a string to datetime. Go to the editor

Sample String : Jan 1 2014 2:43PM

Expected Output : 2014-07-01 14:43:00

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4. Write a Python program to get the current time in Python. Go to the editor

Sample Format : 13:19:49.078205

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5. Write a Python program to subtract five days from current date. Go to the editor

Sample Date :

Current Date : 2015-06-22

5 days before Current Date : 2015-06-17

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6. Write a Python program to convert unix timestamp string to readable date. Go to the editor

Sample Unix timestamp string : 1284105682

Expected Output : 2010-09-10 13:31:22

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7. Write a Python program to print yesterday, today, tomorrow. Go to the editor

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8. Write a Python program to convert the date to datetime (midnight of the date) in Python. Go to the editor

Sample Output : 2015-06-22 00:00:00

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9. Write a Python program to print next 5 days starting from today. Go to the editor

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10. Write a Python program to add 5 seconds with the current time. Go to the editor

Sample Data :

13:28:32.953088

13:28:37.953088

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11. Write a Python program to convert Year/Month/Day to Day of Year in Python. Go to the editor

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12. Write a Python program to get current time in milliseconds in Python Go to the editor

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13. Write a Python program to get week number. Go to the editor

Sample Date : 2015, 6, 16

Expected Output : 25

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14. Write a Python program to find the date of the first Monday of a given week. Go to the editor

Sample Year and week : 2015, 50

Expected Output : Mon Dec 14 00:00:00 2015

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15. Write a Python program to select all the Sundays of a specified year. Go to the editor

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16. Write a Python program to add year(s) with a given date and display the new date. Go to the editor

Sample Data : (addYears is the user defined function name)

print(addYears(datetime.date(2015,1,1), -1))

print(addYears(datetime.date(2015,1,1), 0))

print(addYears(datetime.date(2015,1,1), 2))

print(addYears(datetime.date(2000,2,29),1))

Expected Output :

2014-01-01

2015-01-01

2017-01-01

2001-03-01

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17. Write a Python program to drop microseconds from datetime. Go to the editor

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18. Write a Python program to get days between two dates. Go to the editor

Sample Dates : 2000,2,28, 2001,2,28

Expected Output : 366 days, 0:00:00

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19. Write a Python program to get the date of the last Tuesday. Go to the editor

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20. Write a Python program to test the third Tuesday of a month. Go to the editor

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21. Write a Python program to get the last day of a specified year and month. Go to the editor

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22. Write a Python program to get the number of days of a given month and year. Go to the editor

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23. Write a Python program to add a month with a specified date. Go to th

Explanation:

5 0

3 years ago

The fine for passing a stopped school bus illegally on the right is

ioda

You will pay a minimum fine of $265 for your first offense. A second offense within 5 years of this nature carries an additional $265

8 0

2 years ago