Warm-Up Exercise 2

Due 10:00 am, Friday, Jan. 6

Physics 123, Winter Semester, 2012

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Did you complete the reading assignment?
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An apple is held completely submerged just below the surface of water in a container. The apple is then moved to a deeper point in the water. Compared with the force needed to hold the apple just below the surface, is the force required now bigger or smaller than at first? Explain your answer. (Assume that the density of water is the same at all depths.)

A wooden block floats in water, and a steel object is attached to the bottom of the block by a string. If the block remains floating, which of the following statements are valid. (Choose all the correct statements.)
The buoyant force on the steel object is equal to its weight.
The buoyant force on the block is equal to its weight.
The tension in the string is equal to the weight of the steel object.
The tension in the string is less than the weight of the steel object.
The buoyant force on the block is equal to the weight of the volume of the water it displaces.

Explain your reasoning for your answer to the preceding question

Was there anything that you didn't understand in the reading assignment? If so, explain.

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