Question

You have spent 50 minutes at an average depth of 20 fsw, with a maximum depth of 42 fsw. You started with 2800 psi, and ended with 300 psi in an 80cu.ft./3000 psi cylinder. What is your DACR (depth air consumption rate) and SACR (surface air consumption rate)?

Answer #1

Solution

Depth air Consumption rate = total air used / total time \\Depth air consumption rate is defined as the amount of air one consume in a unit time underwater, it can be tank water or seawater.

total air used = initial air cylinder volume - final volume = 2800-300 = 2500 psi

so Depth air Consumption rate = 2500psi/50min = 50 psi/min.

Surface air consumption rate = total gas consumed/total time take/ pressure at the depth

Now = DACR/ pressure at the depth

In order to calculate the pressure under tank water or sea water = Depth/33 +1 = (Depth+33)/33.

Now Surface air consumption rate = (DACR x 33)/(Depth +33)

As Average depth = 20feet in salt water , Now using above formula , we have

SACR = (2500x33)/(20+33) = 1556.60 psi/min

A lake with a cross-sectional area of 1km2 and a depth of 50
meters has a euphotic zone that extends 15meters blow the surface.
What is the maximum weight of the biomass (in grams of carbon) that
can be decomposed by aerobic bacteria in the water column of the
lake below the euphotic zone during the summer when there is no
circulation with the upper layer? The bacterial decomposition is
(CH2O)n + nO2 nCO2 + nH2O The solubility of...

A lake with a cross-sectional area of 1km2 and a depth of 50
meters has a euphotic zone that extends 15meters blow the surface.
What is the maximum weight of the biomass (in grams of carbon) that
can be decomposed by aerobic bacteria in the water column of the
lake below the euphotic zone during the summer when there is no
circulation with the upper layer? The bacterial decomposition is
(CH2O)n + nO2 nCO2 + nH2O
The solubility of...

Scuba divers have maximum dive times they cannot exceed when
going to different depths. The data in Table show different depth
with the maximum dive times in minutes.
X (depth in feet)
Y (maximum dive time in minutes)
50
60
70
80
90
100
80
55
45
35
25
22
1. Find the linear correlation coefficient?
2. Is the linear correlation(positive or negative)?
3. Find the equation of the least squares regression line.
4. Using the equation in part(c) what...

You are testing a new package handling system. The Historical
average is 35 minutes with a population standard deviation of 8
minutes. A test of the new process on 10 random runs has a mean of
33 minutes.
Let’s say 33 was in fact the true mean of the alternative
hypothesis – in other words an infinite number of sample means at
the new process would have resulted in a mean of 33? What is the
beta error and power...

A survey was conducted to determine, on average, how long
patients have to wait to see a doctor. The number of patients that
ended up waiting up to 2 hours to see a doctor, recorded in
10-minutes intervals, is given in the table below. Calculate the
standard deviation for this distribution. Explain what it means in
the context of this problem.
Waiting time(mins)
10
20
30
40
50
60
70
80
90
100
110
120
Frequency of Occ.
1
4...

1. The average number of minutes spent per day using social
media by a population of college sophomores is 29.6 minutes. If we
take a random sample of size n = 87 from this population and find
that the sample standard deviation is 7.3 minutes, we know the
sampling distribution of the sample mean in this case would have a
standard deviation equal to
A. 4.05 minutes.
B. 1.60 minutes.
C. 0.78 minutes.
D. 7.30 minutes.
E. 3.17minutes.
2. Return...

3. [20] You have been conducting a water quality study of Lake
Arjun, which has a surface area of 8.9 ×105 m2 . The average depth
of the lake is 9 m. The lake is fed by a stream having a flow rate
of 1.02 m3 /s and a phosphorus concentration of 0.023 mg/L. Runoff
from the homes along the lake adds phosphorus at an average annual
rate of 1.25 g/s. The river flows from the lake at a flow...

A plant assembles chairs and tables. The average assembly times
are 20 minutes/chair. Sales
forecasts for the next three months are given in the table.
Product March April Current inventory
Chair 2800 2300 30
Table 500 800 100
The production costs and the selling prices for the products are
shown next.
Product Unit cost Unit price
Chair $150/chair $250/chair
table $400/table $750/table
Monthly inventory charges are 2% of the production cost.
The workforce will be available up to 32000 hours...

suppose that for adults the average amount of time spent
watching tv per day is normally distribution with a mean of 42
minutes and a standard devation of 12 minutes.
1) what percent of adults spend less than 30 minutes watching tv
per day?
A) .04 B) .08 C) .11 D) .13 E) .16
2) What percent of adults more than 50 minutes watching tv per
day?
A) 0.18 B) 0.25 C) 0.45 D) 0.62 E) 0.75
3) what percent...

Suppose the wait time for bus is uniformly distributed from 0 to
20 minutes.
If you look at the average wait times for 50 person samples,
what type of distribution would the sample means follow
approximately?
What would be the mean of the sample means?
What would be the standard deviation of the sample
means?

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 6 minutes ago

asked 6 minutes ago

asked 12 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 3 hours ago

asked 3 hours ago

asked 4 hours ago

asked 4 hours ago

asked 5 hours ago