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Physics Flashcards

1
Q

Convert 5200 PPM to %

A

0.52%

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2
Q

To convert F to absolute you must add?

A

460

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3
Q

What is 65 F in C

A

18.3

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4
Q

How much gas does a 12 L bailout charged with 200 bar hold?

A

2.4 m3

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5
Q

Convert 1500 L to m3

A

1.5 m3

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6
Q

How much gas is required to pressurise a chamber with FV of 20 m3 to 65 msw?

A

130 m3

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7
Q

A 12 L bailout charged to 300 bar has how much gas available to a diver at 75m? (- 10 for reg)

A

3.37 m3

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8
Q

A 64 x 50 L quad is at 195 bar. How much gas does it contain?

A

624 m3

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9
Q

A 10 L bailout at 200 bar. How long would it last in an emergency at 50 msw? (- 10 bar for reg)

A

7 mins 40 seconds

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10
Q

What is the PPo2 of air at 35 msw?

A

945 mb

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11
Q

If a gas contains 12% o2, at what depth would you change it over to prevent the PPo2 dropping below 500mb?

A

32 msw

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12
Q

A chamber at a depth of 230 msw contains 1.5% o2. If vented to surface what would the PPo2 be?

A

15mb

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13
Q

If a diver has 1L of gas in solution at 1 bar absolute, how much would he have in solution at 40 msw?

A

5L

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14
Q

A bell is blown down to a depth of 120 msw and a temperature of 38 C. What would be its depth when it cooled to 28 C?

A

116

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15
Q

During charging a bailout to 200 bar it reached 42 C. What would be the pressure if it cooled to 25 C?

A

189 Bar

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16
Q

What is the amount of gas needed to blow a chamber with a FV of 25 m3 down from 80 msw to 110 msw?

A

75 m3

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17
Q

A chamber contains 12% o2. What would be the PPo2 if it was vented to surface?

A

120 mb

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18
Q

How much gas would a diver consume over 3 hours at a depth of 75 msw at a consumption rate of 35 L/ min?

A

53.6

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19
Q

Convert 0.28% into ppm

A

2800 ppm

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20
Q

What is the PPN2 at a depth of 30 msw breathing air?

A

3.2 bar

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21
Q

A compressor has an output of 60 m3 / hr at 10 bar. How many divers would it support at 50 msw?

A

4

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22
Q

A diver is working at 80 msw, breathing from a 16 x 50 L quad, at a pressure of 150 bar. How long can he work if the quad is changed over at 40 bar.

A

4 hours 40 minutes

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23
Q

What is the PPo2 of air at 47 msw?

A

1.2 bar

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24
Q

A pontoon measures 10 x 3 x 4. It draws 2m. How much does it weigh?

A

61.8 ton

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25
Q

What % o2 is required for a treatment mix with a PPo2 of 2.4 bar at 70 msw?

A

30%

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26
Q

A dDC is at 106 msw. Analyser reads 300 ppm Co2. What is the SEP?

A

0.03%

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27
Q

A DDC is at 75 msw with 4% o2. If vented to surface what’s the PPo2 and o2 %

A

40 mb & 4%

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28
Q

Name the 3 states of bouyancy

A

Positive, neutral & negative

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29
Q

A pontoon displaces 6 m3 of seawater and weighs 5 ton. What’s its state of buoyancy and by how much?

A

1.18 ton positive

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30
Q

What is the pressure exerted by 1 atmosphere in mmHg and PSI?

A

760 mmHg & 14.7 psi

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31
Q

Convert 6220 PPM to a %

A

0.622%

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32
Q

What is the absolute pressure at 165 fsw in PSI ?

A

88.2 PSI

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33
Q

To convert Celsius to Kelvin you must add?

A

273

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34
Q

What is 32 degrees C in F?

A

89.6 F

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35
Q

How much gas does a 10 L bailout hold at 200 bar?

A

2000 L

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36
Q

Convert 1000 L to m3

A

1 m3

37
Q

How much gas to pressurise at chamber with a 22m3 FV to 37 msw?

A

103.4 m3

38
Q

How much gas would a diver use at 100 fsw?

A

5.04 ft3/min

39
Q

How much gas would it take to pressurise a chamber with a FV of 22 m3 to a depth of 37 msw

A

81.4 m3

40
Q

How much gas would a diver require at 100 fsw?

A

5.04 ft3/min

41
Q

A compressor has a delivery of 7 ft3/ min. To what depth would it support a diver?

A

151.8 fsw

42
Q

A 12 liter bailout is charged to 200 bar. If the regulator dive pressure is 8 bar, how much gas is available to the driver at 42 msw?

A

2241.6 litres

43
Q

How much gas is contained in a 45 x 50 L cylinder quad charged to 185 bar?

A

416 m3

44
Q

A 6 L bailout is charged to 200 bar, if drive pressure is 8 bar, what is the bailout duration in an emergency at 52 msw?

A

4 min 30 sec

45
Q

What is the PPo2 of air at 47 msw?

A

1.2 bar

46
Q

If a chamber at 210 msw has 1.5% o2 and was vented to surface what would the PPo2 be?

A

0.015 bar

47
Q

What is the PPN2 of air at 99 fsw?

A

3.16 Ats

48
Q

If a diver has 1 L of gas in solution at 1 bar, how much would he have in solution at 50 msw?

A

6 L

49
Q

A diver weighs 300 lbs & displaces 4.5 ft3 of seawater. If he wants to be 20 lbs negative how much extra weight is required?

A

9.7 lbs

50
Q

A bell recieves an upthrust of 14,250 lbs and weighs 6.5t. How much buoyancy is required to make it 500 lbs positive?

A

813 lbs

51
Q

During blow down to 100m temperature reached 35deg C. What would be the depth if it cooled to 25 degrees C?

A

96.75 m

52
Q

What amount of gas is required to blow a chamber from 30 msw to 60 msw if the chamber volume is 14 m3?

A

56 m3

53
Q

A chamber contains 6% O2 at 60m. What would it be if vented to surface?

A

0.06 bar

54
Q

How much gas would a diver consume over 4 hours at 110 msw?

A

100.8 m3

55
Q

How much gas would a diver consume over 4 hours at 110 msw?

A

100.8 m3

56
Q

A diver is working at 130 fsw. How much air is he breathing / minute?

A

6.17 ft3 / min

57
Q

A diver is working at 25 msw, what’s his consumption / minute?

A

122.5 L / min

58
Q

What is the minimum volume a compressor needs to supply a diver at 30 msw?

A

140 L/min

59
Q

A 64 x 50 quad is at 200 bar, and can be used until the pressure drops to 40 bar. What volume of gas is available to the diver?

A

512 m3

60
Q

A quad contains 22,500 ft/3 at 3000 psi. How much does is contain at 2000 psi?

A

15,000 ft/3

61
Q

What volume of gas is required to pressurise a 15 m3 chamber to 90 msw?

A

135 m3

62
Q

What volume of gas is required to pressurise a 350 ft/3 chamber to 400 fsw?

A

4242 ft3

63
Q

A wet bell displaces 3.5 m3 of sea water. What is the upthrust of the bell?

A

3.61 ton

64
Q

A pontoon is 10m x 5m x 2m and floats with a freeboard of 0.5m. What is its weight?

A

77.25 ton

65
Q

What is the PPo2 of air at 40 msw?

A

1.05

66
Q

What is the PPo2 of air at 90 fsw?

A

0.78 ats

67
Q

What is the PPo2 of a 12% mix at 120 msw?

A

1.56 ba

68
Q

What is the PPo2 of an 18% mix at 70 msw?

A

1.44 ba

69
Q

What is the PPo2 in a 16% mix at 260 fsw?

A

1.42 ats

70
Q

How deep can a diver go using a 50/50 nitrox mix without exceeding a PPo2 of 1.5 bar?

A

20 m

71
Q

A diver works for 20 min at 50 msw. How much gas does he use?

A

4,200 litres

72
Q

A bell displaces 7.7 m3 seawater and weighs 7.5 ton. How much weight is needed to make it negatively buoyant by 300 kg?

A

731 kg

73
Q

A pontoon is 10m x 7m x 2m and weighs 110 ton. What will its freeboard be in salt water

A

470 mm

74
Q

Which of the following is equivalent to bar?
Kg/cm2
msw
KPa
fsw

A

Kg/cm2

75
Q

Convert 1550 ppm to %

A

0.155%

76
Q

A 10 ton lift bag was filled with 1 m/3 of air at 40 msw. What will the volume of air be at surface?

A

5 m3

77
Q

How long will a 10 L bailout charged to 160 bar last at 40 msw if the regulator drive pressure is 12 bar?

A

7 mins 9 seconds

78
Q

A 16 x 50 quad contains 160 bar. How long will it last 2 divers at 75 msw if the regulator drive pressure is 12 bar? (quad changed at 40 bar)

A

2 hours 13 mins

79
Q

A bailout charged to 180 bar reaches 41 degrees C. What is the pressure of it cools to 30 degrees C?

A

173.7 bar

80
Q

A diver dives to 44 msw on air, what is his PPo2?

A

1.13 bar

81
Q

A pontoon is 15m long by 4 wide and 2 high. It has a draft of 1.5m. What is its upthrust?

A

92.7 ton

82
Q

How much weight can be placed on the pontoon until it sinks?

A

30.9 ton

83
Q

A pontoon is 23 long x 5 wide x 4 high. It weighs 350 ton. What is it’s freeboard?

A

1.04 m

84
Q

A chamber is vented from 100 msw with oxygen content of 3.57% to 25 msw. What is the o2 % and PPo2?

A

3.57 % / 0.12 PPo2

85
Q

What is 28 degrees C in F?

A

82.4

86
Q

You have 10% online to the BIBS. What depth do you need to change to a richer mix in order to prevent PPo2 falling below 0.16 bar?

A

6 msw

87
Q

A DDC is at a depth of 90 msw and contains 5% o2. If vented to 10 msw what is the PPo2?

A

0.1 bar

88
Q

A bell displaces 8 m3 of seawater and weighs 8 ton. How much weight must be added to make if -500 kg negatively buoyant?

A

740 kg

89
Q

What is the equivalent air depth formula?

A

(Decimal % N2) x (msw + 10) - 10
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