Mathematics assignment help

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QUESTION 1

Number Freq 9 5 10 2 12 3

Given the sample distribution shown here, compute the standard deviation.

1.3

1.37

2.2

2.27

QUESTION 2

The half-value thickness of 147-pound per cubic foot concrete is 2.7 inches for a cobalt- 60 source. How thick does the shielding need to be to reduce a 900 mR source to 200 mR exposure?

2.7 inches 5.4 inches 10.8 inches 1.85 inches

QUESTION 3

The company fire brigade is preparing to attack a large hydrocarbon fuel-based fire at

https://online.columbiasouthern.edu/bbcswebdav/pid-6462471-dt-content-rid-45577250_1/xid-45577250_1

3% 26.2% 30% 38%

QUESTION 4

Ruthenium (Ru) has a half-life of 1 year. How long will it take for an 1800 µCurie source to be reduced to 225 µCurie?

1 year

2 years

3 years

4 years

QUESTION 5

Determine the pH of a solution in which [H+] = 4.5 x 10-5 moles per liter.

-4.3 mild acid

4.3 mild acid

4.3 strong base

-4.3 strong base

QUESTION 6

A combustible gas indicator on a calibrated hot wire gas detector reads 10% for methane, which has a 4.9% Lower Explosive Limit (LEL). How many parts per million does this represent?

3500 ppm 4900 ppm 7000 ppm 9200 ppm

QUESTION 7

2C2H2 + 5O2 → 4CO2 + 2H2Ohttps://online.columbiasouthern.edu/webapps/assessment/take/launch.jsp?

The balanced equation below shows the complete oxidation of acetylene. If 20 moles of oxygen were consumed in the oxidation process, how many grams of CO2 (MW = 44) would be produced? 2C2H2 + 5O2 → 4CO2 + 2H2O

The company fire brigade is preparing to attack a large hydrocarbon fuel-based fire at your plant. The approach involves several hose lines and a combination of foam and dry chemical suppression agents. All water-fed lines are supplied from two pumpers arranged in a parallel formation for reliability. The only two fire pumps available have individual probabilities of success of .8 and .88 respectively. Based on this information, what is your estimate of the overall probability of water supply failure during this operation?

35.2 grams

352 grams

70.4 grams

704 grams

QUESTION 8

Find the velocity pressure in a 1.75 inch (actual diameter) open-ended pipe with 275 gallons per minute of water flowing?

9 psi

14 psi

96 psi

154 psi

QUESTION 9

What is the capacity of a fuel tank that is 35 foot in diameter and 25 feet high? 19,765 gallons 24,052 gallons 124,050 gallons 179,915 gallons

QUESTION 10

One plant within your company has experienced 25 recordable mishaps involving days away from work and 41 cases involving restricted workdays. The plant has 2,000 full- time employees who are involved in a straight manufacturing operation that meets the classification of the Standard Industry Code (SIC) number 100. The national experience rate for SIC 100 is 6.0. Which of the following statements is correct concerning the DART (days away, restrictions, and transfers) rate for this plant?

Plant is over national experience rate Plant has a rate 1.2 times national rate Plant is even with national rate SIC-100 Plant rate is only 55% of SIC-100 rate

A hoisting chain with a minimum breaking strength of 20 tons has been proof-tested to 32,000 pounds. At what value would you assign the working load limit?

16,000 lbs 20,000 lbs 32,000 lbs 40,000 lbs

5 points Save Answer

QUESTION 12

If a source of Co-60 was discovered in a laboratory and had a reading of 2 Ci, and the half-life of Co-60 is 5.24 years, what was the original reading for the source? Paperwork found in the lab indicates that the source was obtained 10 years ago.

3.4

5.2

7.5

8.0

QUESTION 13

What is the combined sound pressure level (SPL) from two identical machines located adjacent to each other, if each machine is producing 85 dBA? What would the combined SPL be if there were four machines, eight machines, and 10 machines?

88, 91, 93.5, and 95.4 dBA 91, 97, 101, and 105.5 dBA 88, 91, 94, and 97 dBA 88, 91, 94, and 95 dBA

QUESTION 14

A 30-ton gantry crane has been out of service for more than 6 months for structural repair. It is required to be proof-tested at __________ before being used.

15 tons 19 tons 30 tons 38 tons

QUESTION 15

A safety professional has been assigned to the same project for the last 4 years and has made a site-wide safety inspection each week. Assuming a normal distribution, what is the best estimate of the number of inspections that had safety scores within ±1 standard deviations of the mean?

141

198

207

208

QUESTION 16

Year Total Recordable Columns G, H, I, J LWDs

LWDs LWD Cases Columns H and I

Days away from Work

Days of Restricted Work Activity

Man- hours

2010 92 1932 67 1565 367 1,398,765

2011 88 2002 81 1622 380 1,456,732

2012 119 1821 98 1384 137 1,129,565

2013 125 1754 95 1316 438 1,623,451

2014 122 1234 98 740 494 1,834,225

Given the information in the accident information chart shown below, determine the DART (days away, restrictions, and transfers) rate for 2013.

27.6

11.7

9.01

2.16

QUESTION 17

If, in the preceding question, the awards had been $2,000 for first place, $1,500 for second place, and $1,000 for third place, how many ways could the awards be given?

10 12 120 720

QUESTION 18

Your company has an aggressive safety awards program for your over-the-road transport drivers; 10 drivers are semi-finalists for three monetary awards – each $2,000 in value. How many ways can the awards be given?

10

12

120

720

5 points Save Answer

QUESTION 19

Year Total Recordable Columns G, H, I, J LWDs

LWDs LWD Cases Columns H and I

Days away from Work

Days of Restricted Work Activity

Man- hours

2010 92 1932 67 1565 367 1,398,765

2011 88 2002 81 1622 380 1,456,732

2012 119 1821 98 1384 137 1,129,565

2013 125 1754 95 1316 438 1,623,451

2014 122 1234 98 740 494 1,834,225

Determine the cumulative DART accident rate for the 5 years shown in the chart above.

27.7

11.79

10.9

2.79

QUESTION 20

Year Total Recordable Columns G, H, I, J LWDs

LWDs LWD Cases Columns H and I

Days away from Work

Days of Restricted Work Activity

Man- hours

2010 92 1932 67 1565 367 1,398,765

2011 88 2002 81 1622 380 1,456,732

2012 119 1821 98 1384 137 1,129,565

2013 125 1754 95 1316 438 1,623,451

1834,225

Determine the recordable accident rate for the last 3 years shown in the chart above.

Question Completion Status:

494740981234122 2014

11.8

31.4

2.76

15.95

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