These pictures show the equipment you will use in this lab and how it should be
ID: 2032899 • Letter: T
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These pictures show the equipment you will use in this lab and how it should be connected TE ??] 5) Triple-Bea Balance Gradusted Cylinder Water 6) Read the following proceodure carcfally, After reading the entire procedure, you may begin the lab. a At your table there should be a triple-beam balance, a lab stand, a graduated cylinder, some string, two paperclips, a wooden block, and a set of masses (or other assortod objects) b. The triplc-beam balance should be atop the lab stand. A loop of black thread should be dangling from underncath the triple-beam balance. Attach the paperclips to opposite ends of the string Hang one of the paperelips from the black thread. Do not remove the string or the paperclips until you are finished with the lab except to make adjustments to the length of the string. The set up should be as in (5). c. Fill the graduated cylinder abou1% to filled with water d. Attach one of the five objects (your instructor will tell you which to use) to the paperclip and measure its mass in air. Duly record this value in your data table. e Gently place the object (it should still be on the string) into the graduated cylinder. As a result, the water in the cylinder will rise. The object must be hanging straight down and it must be completcly submerged. If it docsn't mcet both of these critcria, make appropriate adjustments and repcat. Your setup should look like the figure in (5). f. Measure the "apparent" mass of the object while it is in the water and record the value. Also record the volume of the displaced water g Remove the objcct h. i. Repeat steps d-g until you have used all five objects. Clean up your station. 36Explanation / Answer
Weight = mass x acceleration due to gravity (9.8 m/s^2). The unit for weight would be Newton. Buoyant force is actual weight in air minus apparent weight in water.
As per the Archimedes principle, weight lost by a body in water is equal to the weight of the water displaced by the body. And since the bouyant force is equal to the weight lost in water, it is also equal to the weight of water displaced.
The weight of the water displaced should ideally be equal to the weight loss that a body experiences when weighed in vacuum as against when it is weighed in the water. However, we have calculated the weight loss by taking the weight of the body in air rather than in vacuum. Thus, there will be small discrepancies. Also, we have assumed water to have a density of 1 gram per cubic metre. Whereas the actual density of water varies with temperature and the type of water (distulled, tap water etc.)
Theoretically, mass of an object doesn't change whether it is taken in water or air. When we talk about mass in water, what we actually do is measure the weight (not mass) in water and then divide it by accelaration due to gravity. The word apparent mass, thus, means the mass that would have produced the same weight in air as is being produced by the given body in water.
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