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Physics of Diving > Buoyancy of Objects (Phase 3) Litres Needed to be Neutral > Flashcards

Buoyancy of Objects (Phase 3) Litres Needed to be Neutral Flashcards

1
Q

How do you find the litres needed to make an object neutral in water?

A

The weight in water divided by the weight of water per litre equals the litres needed to be neutral.

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2
Q

An object weighs in seawater 9.7kg.

How much upward force in litres needs to be added to make the object neutral?

A

9.7kg (weight in water) ÷ 1.03kg (seawater)

= 9.41litres (displaced to be neutral)

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3
Q

An object weighs in fresh water 23kg.

How much upward force in litres needs to be added to make the object neutral?

A

23kg (weight in water) ÷ 1kg (fresh water)

= 23litres (displaced to be neutral)

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4
Q

An object weighs in seawater 18.05kg.

How much upward force in litres needs to be added to make the object neutral?

A

18.05kg (weight in water) ÷ 1.03kg (seawater)

= ​17.52litres (displaced to be neutral)

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5
Q

An object weighs in fresh water 9kg.

How much upward force in litres needs to be added to make the object neutral?

A

9kg (weight in water) ÷ 1kg (fresh water)

= 9litres (displaced to be neutral)

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6
Q

An object weighs in seawater 48.9kg.

How much upward force in litres needs to be added to make the object neutral?

A

48.9kg (weight in water) ÷ 1.03kg (seawater)

= ​47.47litres (displaced to be neutral)

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7
Q

An object weighs in fresh water 380kg.

How much upward force in litres needs to be added to make the object neutral?

A

380kg (weight in water) ÷ 1kg (fresh water)

= 380litres (displaced to be neutral)

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8
Q

An object weighs in seawater 0.94kg.

How much upward force in litres needs to be added to make the object neutral?

A

0.94kg (weight in water) ÷ 1.03kg (seawater)

= ​0.91litres (displaced to be neutral)

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9
Q

An object weighs in fresh water 784.3kg.

How much upward force in litres needs to be added to make the object neutral?

A

784.3kg (weight in water) ÷ 1kg (fresh water)

= 784.3litres (displaced to be neutral)

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10
Q

An object weighs in seawater 2.5kg.

How much upward force in litres needs to be added to make the object neutral?

A

2.5kg (weight in water) ÷ 1.03kg (seawater)

= ​2.42litres (displaced to be neutral)

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11
Q

If an object in neutral in seawater, what will happen if the same object is moved into fresh water?

A

If an object is neutral in seawater, it would become negatively buoyant and sink if moved into fresh water.

Seawater weighs more than fresh water, therefore has a greater upward force on an object.

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12
Q

An object is neutral with 15litres of air displaced in a liftbag in seawater.

How many litres need to be added to the liftbag to make it neutral in fresh water?

A

15litres (neutral in seawater) × 1.03kg (seawater)

= 15.45litres (neutal is fresh water)

Add 0.45litres to liftbag

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13
Q

An object is neutral with 50litres of air displaced in a liftbag in seawater.

How many litres need to be added to the liftbag to make it neutral in fresh water?

A

50litres (neutral in seawater) × 1.03kg (seawater)

= 50.5litres (neutal is fresh water)

Add 1.5litres to liftbag

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14
Q

An object is neutral with 80litres of air displaced in a liftbag in fresh water.

How many litres need to be subtracted from the liftbag to make it neutral in seawater?

A

80litres (neutral in fresh water) ÷ ​1.03kg (seawater)

= 77.66litres (neutal in seawater)

Subtract 2.34litres to liftbag

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15
Q

An object is neutral with 100litres of air displaced in a liftbag in fresh water.

How many litres need to be subtracted from the liftbag to make it neutral in seawater?

A

100litres (neutral in fresh water) ÷ ​1.03kg (seawater)

= 97.08litres (neutal in seawater)

Subtract 2.92litres to liftbag

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16
Q

An object is neutral with 120litres of air displaced in a liftbag in seawater.

How many litres need to be added to the liftbag to make it neutral in fresh water?

A

120litres (neutral in seawater) × 1.03kg (seawater)

= 123.6litres (neutal is fresh water)

Add 3.6litres to liftbag

17
Q

An object is neutral with 150litres of air displaced in a liftbag in fresh water.

How many litres need to be subtracted from the liftbag to make it neutral in seawater?

A

150litres (neutral in fresh water) ÷ ​1.03kg (seawater)

= 145.63litres (neutal in seawater)

Subtract 4.37litres to liftbag

18
Q

An object is neutral with 5litres of air displaced in a liftbag in seawater.

How many litres need to be added to the liftbag to make it neutral in fresh water?

A

5litres (neutral in seawater) × 1.03kg (seawater)

= 5.15litres (neutal is fresh water)

Add 0.15litres to liftbag

19
Q

An object is neutral with 8litres of air displaced in a liftbag in fresh water.

How many litres need to be subtracted from the liftbag to make it neutral in seawater?

A

8litres (neutral in fresh water) ÷ ​1.03kg (seawater)

= 7.76litres (neutal in seawater)

Subtract 0.24litres to liftbag

20
Q

An object weighs in seawater 9.7kg.

The object needs 9.41lites added to make in neutral.

How would you make the object positively buoyant?

A

Increase the weight of what the object weighs.

9.7kg (weight in water) + 2kg (extra weight)

= 11.7kg (increased weight)

÷ 1.03kg (seawater)

= 11.35litres (displaced to be positive)

Physics of Diving (10 decks)

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