Need Helps Essay

1149 words - 5 pages


Physics Final Exam revision c 4/8/15
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. ...view middle of the document...

The barge's area is 15m².
V = L×W×H = .6m³
H (depth of sinking) = .6m³/15m² = .04m = 40mm”

3. 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.

As the gas flow from a larger diameter to a small diameter, the streamline get closer together; the speed increases; the internal pressure decreases.


4. When a 3-kg iron skillet is heated on the stove, it becomes hot very quickly. When 3 kg of water is heated on the stove it heats up slowly. What is the reason for this difference? Support your answer using 3 – 4 complete sentences.
Iron specific heat c i is 9 times lower if compared with water specific heat c w means that the heat necessary for getting the same overtemperature on the same mass is 9 times higher on water

5. In a lab experiment, 45 grams of a metal are heated from 22⁰C to 78⁰C by the addition of 450 J of heat. What is the specific heat of the metal? Show all calculations leading to an answer.

6. A photon of light has a wavelength of about 600 nm (1nm = 1 x 10-9 m). What is the energy of this photon of light? Show all calculations leading to an answer.

7. When a wave crosses a surface at an angle from one medium into another, why does it change directions as it moves across the boundary into the new medium? Use 3 – 4 complete sentences in your own words to explain.

8. Suppose a piano tuner hears 2 beats/second when listening to the combined sound from the tuning fork and the piano note being tuned. After slightly loosening the string, she hears 1 beat/second. Should she continue to loosen the string or tighten it in order to get it “in tune”? Defend your answer with 3 – 4 complete sentences.

9. What conditions must exist for a converging lens to produce a real image of an object that is larger than the object itself? Please respond with 3 - 4 complete sentences.

10. Suppose the thickness of an oil film on water is just the right thickness for canceling red light. What...

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