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# Practice Test 3 - page 4 / 16

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4.

Objects with a smaller density will float on top of objects with a greater density, thus the oil floats on top of the vinegar.

• Predict what would happen if each of the following were dropped into the separated salad dressing (that is, describe where would each object would settle). Briefly explain your reasoning for each: steel nut (density = 7.75 g/mL)

The steel nut will sink to the bottom of the bottle since oil density < vinegar density < steel density, and the object with less density float on top of objects with greater density.

chunk of candle wax (density = 0.95 g/mL)

The candle wax will float at the interface of the oil and vinegar (i.e. sink in the oil, but float on the vinegar) since oil density < wax density < vinegar density.

cork stopper (density = 0.32 g/mL)

The cork will float on top of both liquids, since cork density < oil density < vinegar density.

• Which would have more mass—a bottle filled with oil only or the

same bottle filled with vinegar only? Explain your reasoning.

How did the “blowing-through-straws” analogy help you understand the idea that thinner bulb filaments have more resistance to the flow of electricity than thicker bulb filaments (of the same length)? In answering this question,

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