ef152-rec-4-3 - EF 152 Physics for Engineers Spring 2009...

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EF 152 – Physics for Engineers Spring, 2009 Recitation 4.3 Fluids Task 1. Concept Questions 1. You are walking out on a frozen lake and you begin to hear the ice cracking beneath you. What is your best strategy for getting off the ice safely? a. stand absolutely still and don’t move a muscle b. jump up and down to lessen your contact time with the ice c. try to leap in one bound to the bank of the lake d. shuffle your feet (without lifting them) to move towards shore e. lie down flat on the ice and crawl toward shore 2. Three containers are filled with water to the same height and have the same surface area at the base, but the total weight of water is different for each. Which container has the greatest total force acting on its base? a. container 1 b. container 2 c. container 3 d. all three are equal 3. Imagine holding two identical bricks in place under water. Brick 1 is just beneath the surface of the water, while brick 2 is held about 2 feet down. The force needed to hold brick 2 in place is: a. greater b. the same c. smaller 4. A boat carrying a large chunk of steel is floating on a lake. The chunk is then thrown overboard and sinks.
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This note was uploaded on 04/07/2009 for the course EF 152 taught by Professor Ab during the Spring '08 term at University of Tennessee.

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ef152-rec-4-3 - EF 152 Physics for Engineers Spring 2009...

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