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Trainee Bell Dive Supervisors > Physics > Flashcards

Physics Flashcards

1
Q

1 Atmosphere =

A

10.08m
33.07 feet of seawater
33.90 feet of freshwater
1.033 kg/cm2
14.7 psi
1.013 bar
101 lap
760 mmHg

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2
Q

Absolute pressure

A

Relative to a vacuum

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3
Q

Gauge pressure

A

Relative to atmospheric pressure

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4
Q

What is 640ppm expressed as a %

A

0.065

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5
Q

What is 21% O2 expressed as a decimal percentage

A

0.21

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6
Q

You wish to press a 20m3 chamber to 70m and establish a PPO2 of 0.4bar. Using 12/88 and 2/98 heliox. To what depth do you press with 12/88?

A

(210-400)- ( 70x 2)
—————————
(12-2)
190-140
—————
10

50
——
10
=5m

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7
Q

At Sat system has three 15m3 chambers, a 10m3 TUP and a 6m3 bell. How much gas to press to 180msw?

A

3x15= 45+10+6 = 65m3
(180 divided by 10)= 18
18 x 61= 1098m3

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8
Q

1ATA to PSI

A

14.7 PSI

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9
Q

23°C to °F

A

(23x1.8)+32= 75°F

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10
Q

36°C to KELVIN

A

36 + 273= 309K

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11
Q

79°F to Rakin

A

79+ 460= 539R

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12
Q

101°F to °Celsius

A

(101-32) divided by 1.8=38.29°C

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13
Q

298K to °C

A

298-273= 25°C

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14
Q

1ATA to PSI

A

14.7PSI

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15
Q

88.2PSI(A) to FSW

A

88.2 /33-1= 1.67= 167.2FSW

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16
Q

2000 Litres(FW) to M3

A

2M3

17
Q

99 FSW to ATM

A

99/33= 3ATM

18
Q

1Ft3(SW) to Lb

A

64.38Lb

19
Q

1M3 (SW) to Te

A

1.03Te

20
Q

99FSW to ATA

A

4ATA

21
Q

30MSW to BAR(G)

A

3BAR(G)

22
Q

30MSW to BAR(A)

A

4 BAR(A)

23
Q

1 BAR is equal to

A

750mmHg, 14.5Psi

24
Q

What is the PPO2 in a 5% mix at 300ft?

A

PPO2=(300+33/33)x5%
=10.09x 0.05
=0.504
=504mb

25
Q

How much would an object 15m x 4m x 3m, and a density of 3800kg/m3 weigh in fresh water

A

15x4x3x3800= 684000kg
15x4x3x1000= 180000kg
684000-180000= 504000kg
=504Tonnes

26
Q

A chamber is at 50msw, the internal temperature is 20°C. If it drops to 17°C what will the new depth be?

A

P2=P1T2/T1
=6x(273+17)/(273+20)
=6x290/293
=49.3msw

27
Q

A diver is at 100msw with a 15 litre bailout bottle charged to 210bar. What volume of gas is available to him?

A

100msw=11bar
Reg=10bar
210-11-10=189bar x 15litre=
2835litre available
Or 2.835m3

28
Q

How long would a 15 litre bailout pumped to 210 bar last at 100msw?

A

100msw = 11bar
-Reg=10bar
Breathing Rate 40L/min x11bar= 440L/min
(210-11-10)x15=2835/40=6.443
6minutes (.443x60)=26seconds

29
Q

How much gas will a diver at 90 FSW use over 45 minutes?

A

90+33/33= 3.72ATA
1.25ft3/minute x 3.72= 4.65ft3/minute x 45=209Ft3

30
Q

A bellman reports a CO2 level of 2480 PPM in the bell at 90m. What is the PPO2 as a %

A

2486 x 10000= 0.2480= 0.2480%

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