# UMass Amherst PHYSICS 131 - final exam study guide 131 (3 pages)

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## final exam study guide 131

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- Pages:
- 3
- School:
- University of Massachusetts Amherst
- Course:
- Physics 131 - Intro Physics I

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Conversions 1 inch 0254 meters 1 g 001 kg 1 second 1000 milliseconds 1 m 100 cm 1 inch 2 54 cm 1Pa 9 86E 6 atm 1cm 3 1 100 3 m Wave Motion Amplitude Max of the wave Period T Time to make 1 cycle of motion Frequency of cycles per second 1 T T 2pi sqrt L g v Wavelength frequency Wavelength 2L n Transverse string electromagnetic Longitudinal sound spring slinky Torsional twisting as in Tacoma Narrows Bridge Combinations surface water waves Constructive interfernce two peaks two toughs meet Deconstructive interference One peak one trough meet Speed of sound sqrt 140 P p P Air pressure p Air densitiy Fluids and Pressure Pressure Force Area Pa or N m 2 Fi Ai Ff Af Weight of fluid column m p A H g p density P pHg Pressure Atmospheric pressure P Po Dgh Where d density of water 1030 kg m 3 Po 1 atm density of salt water 1 028 g L density of fresh water 1 g L the volume of fresh water with an equal mass x will satisfy the following equation l w h1 1 028 l w h2 1 M Density Volume In freshwater Mg L W h total h above 1 g h total h above M L W Same for salt but with 1 03 instead of 1 Ex People with very good pitch discrimination can very quickly determine what note they are listening to The note on the musical scale called C6 two Tension on a string octaves above middle C has a frequency of 1050 Hz Some trained T g V Density of liquid Density musicians can identify this note after hearing only 12 cycles of the wave T 1 f 1 1050 9 52E 4 seconds 12 cycles 00114 s 11 4 ms of object on the string Ex What is the maximum mass that can hang without sinking from a 70 cm diameter Styrofoam sphere in water Assume the volume of the mass is negligible compared to that of the sphere Find mass of sphere Density Volume 4 3pi r 3 Find mass of displaced water Volume of sphere 1000kg Mass of water Mass of sphere Answer If the rectangular barge is 3 5 m by 22 0 m and sits 0 90 m deep in the harbor how deep will it sit in the river Harbor 3 5 22 9 1027 71171 1 River 3 5 22 h 1000 77000h 71171 1

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