For each of the following partial sentences, indicate whether they are correctly
ID: 1980721 • Letter: F
Question
For each of the following partial sentences, indicate whether they are correctly completed by the phrase greater than," less than," or the same as." Explain your reasoning for each choice (you will not receive any credit for answers which do not include explanations).a. A chunk of iron is sitting on a table. It is then moved from the table into a bucket of water sitting on the table. The iron now rests on the bottom of the bucket. The force the bucket exerts on the block when the block is sitting on the bottom of the bucket is ....................the force that the table exerted on the block when the block was sitting on the table.
b. A chunk of iron is sitting on a table. It is then moved from the table into a bucket of water sitting on the table. The iron now rests on the bottom of the bucket. The total force on the block when it is sitting on the bottom of the bucket............ it was on the table.
c. A chunk of iron is sitting on a table. It is then covered by a bell jar which has a nozzle connected to a vacuum pump. The air is extracted from the bell jar The force the table exerts on the block when the block is sitting in a vacuum is............ the force that the table exerted on the block when the block was sitting in the air.
d. A chunk of iron is sitting on a scale. The iron and the scale are then both immersed in a large vat of water. After being immersed in the water, the scale reading will be .........the scale reading when they were simply sitting in the air. (Assume the scale would read zero if nothing were sitting on it, even when it is under water.)
Explanation / Answer
a. "The same as" This is due to the 3rd Law which says, a force on object A by object B is equal in magnitude and opposite in direction to the force on object B by object A, in these two cases the force on the object by the iron is the force of gravity (Fgrav) and so the force on the iron by the object is also Fgrav. Fgrav is the same when in the water and out of the water, so "The same as". b. "The same as" Same amount of force (Fgrav), Normal force is also the same. c. "The same as" Air, or no air, gravity is the same and Fgrav=mg (mass x gravity). d. "The same as" Assuming there are no air in the iron or scale that would want to make them float, the scale reading would still be the weight (mass x gravity). And both the mass and gravity will be the same.
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