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How would you explain these facts?

The volume of an iceberg is 664,000 ft^3.

(a)

What is its weight (in lb), assuming it is pure ice? (Round your answer to at least four significant figures.)

____ lb

(b)

What is the volume of seawater (in ft^3) it displaces when floating? (Hint: You know what the weight of the seawater is. Round your answer to at least three significant figures.)

____ ft cubed

(c)

What is the volume of the part of the iceberg out of the water (in ft^3)?

____ ft cubed

Thank you for the help!

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A juniper-wood plank measuring 0.46 ft by 1 ft by 14 ft is totally submerged in water.

(a) What is its weight?

_____ lb

(b) What is the buoyant force acting on it?

_____ lb

(c) What is the size and the direction of the net force on it?

size

_____ lb

... direction up or down?

A large tanker truck can carry 21 tons (42,000 lb) of liquid.

(a)

What volume of antifreeze (in ft^3) can it carry?

_____ f^t3

(b)

What volume of pure water (in ft^3) can it carry?

_____ ft^3