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Checking Why a Soaked Block Sinks 4 questions
Checking Why a Soaked Block Sinks
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A display compares two porous blocks with the same dry mass and the same outside volume. After exposure to water, each is enclosed in an identical thin sleeve that keeps its retained water inside and prevents tank water from entering. In this model the sleeve adds negligible mass and volume. The enclosed block floats if its average density is less than 1.00 g/cm3.
| Block | Dry mass (g) | Outside volume (cm3) | Mass after exposure (g) |
|---|---|---|---|
| P | 12 | 20 | 12 |
| Q | 12 | 20 | 22 |
Question 1
Which block sinks after exposure and enclosure in the model?
- P only
- Q only
- Both blocks
- Neither block
Question 2
Calculate the mass of water retained by each block. Show how you use the dry mass.
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Question 3
A student says equal dry density guarantees the same behavior in the tank after exposure. Evaluate the claim using both mass readings.
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The class considers a third 12 g block of the same outside volume. It can retain 7 g of water during exposure.
Question 4
Predict whether the enclosed third block will float after exposure. Show the average density.
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