Physics Final Exam Version 2c 2

Topics: Electron, Electric charge, Sphere Pages: 4 (1084 words) Published: April 26, 2015
Physics Final Exam revision c4/8/15
Directions: It is important that you provide answers in your own words. Please focus only on information from the text/eBook to create your own solutions.  Please do not use direct information from an outside source (especially copying and pasting from an “answer” website). Use of direct information from an outside source is against school policy.  All answers will be checked for plagiarism. Instances of plagiarism can result in probation or possible dismissal from the school. Grading: Please be sure to follow all guidelines (number of sentences/showing all calculations) and to provide the correct metric units of measure. It is important for you to observe the number of sentences, when required. This helps me assure the integrity of your responses. All questions are 5 points (1 point for sentence number /correct units). Consider eight, eight-cubic centimeter (8 cm3) sugar cubes stacked so that they form a single 2 x 2 x 2 cube. How does the surface area of the single, large cube compare to the total surface area of the individual eight cubes? Report your answer as a ratio. Be sure to show all calculations leading to an answer.

A rectangular barge 7 m long and 2 m wide floats in fresh water. How much will the barge sink when loaded with 600 kg of sand? Show all calculations leading to an answer. 600kg sand displaces 600kg water.

Water's density is ≈ 1,000kg/m³
The displaced water occupies about 600/1000=.6m³
The barge's area is 14m².
V = L×W×H = .6m³
H (depth of sinking) = .6m³/14m² = .04m = 40mm

When a steadily-flowing gas flows from a larger-diameter pipe to a smaller-diameter pipe, what causes the pressure in the smaller pipe to drop? Use 3 – 4 complete sentences to explain your answer. The gas speeds up, because it must do so for it to carry the same volume of gas per second as the larger pipe does.

Because of Bernoulli's Principle, the faster moving gas in the smaller pipe...
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